Table: Schedule of Long-term Debt, Detail [Table]

Line Label Object Class Period Type Balance Name
1 Schedule of Long-term Debt, Detail [Table] [Table]

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 added:ScheduleLongTermDebtDetailTable
2 Legal Entity [Axis] [Axis]

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 dei:LegalEntityAxis
3 Consolidated Entity [Domain] [Domain]

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 dei:EntityDomain
4 Long-term Debt, Detail [Line Items] [Line Items]

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 added:LongTermDebtDetailLineItems
5 Long-term Debt, by Current and Noncurrent [Roll Up] [Abstract]

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 us-gaap:LongTermDebtByCurrentAndNoncurrentAbstract
6 Long-term Debt, Current Maturities [Roll Up] [Abstract]

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 us-gaap:LongTermDebtCurrentAbstract
7 Line of Credit, Current [Concept] Monetary As Of Credit us-gaap:LinesOfCreditCurrent
8 Secured Debt, Current [Concept] Monetary As Of Credit us-gaap:SecuredDebtCurrent
9 Unsecured Debt, Current [Concept] Monetary As Of Credit us-gaap:UnsecuredDebtCurrent
10 Convertible Debt, Current [Concept] Monetary As Of Credit us-gaap:ConvertibleDebtCurrent
11 Subordinated Debt, Current [Concept] Monetary As Of Credit us-gaap:SubordinatedDebtCurrent
12 Convertible Subordinated Debt, Current [Concept] Monetary As Of Credit us-gaap:ConvertibleSubordinatedDebtCurrent
13 Long-term Commercial Paper, Current [Concept] Monetary As Of Credit us-gaap:LongTermCommercialPaperCurrent
14 Long-term Construction Loan, Current [Concept] Monetary As Of Credit us-gaap:LongTermConstructionLoanCurrent
15 Long-term Transition Bond, Current [Concept] Monetary As Of Credit us-gaap:LongtermTransitionBondCurrent
16 Long-term Pollution Control Bond, Current [Concept] Monetary As Of Credit us-gaap:LongtermPollutionControlBondCurrent
17 Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Current [Concept] Monetary As Of Credit us-gaap:JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustCurrent
18 Notes and Loans Payable, Current [Roll Up] [Abstract]

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 us-gaap:NotesAndLoansPayableCurrentAbstract
19 Notes Payable, Current [Roll Up] [Abstract]

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 us-gaap:NotesPayableCurrentAbstract
20 Medium-term Notes, Current [Concept] Monetary As Of Credit us-gaap:MediumtermNotesCurrent
21 Convertible Notes Payable, Current [Concept] Monetary As Of Credit us-gaap:ConvertibleNotesPayableCurrent
22 Notes Payable to Bank, Current [Concept] Monetary As Of Credit us-gaap:NotesPayableToBankCurrent
23 Senior Notes, Current [Concept] Monetary As Of Credit us-gaap:SeniorNotesCurrent
24 Junior Subordinated Notes, Current [Concept] Monetary As Of Credit us-gaap:JuniorSubordinatedNotesCurrent
25 Other Notes Payable, Current [Concept] Monetary As Of Credit us-gaap:OtherNotesPayableCurrent
26 Notes Payable, Current, Total [Concept] Monetary As Of Credit us-gaap:NotesPayableCurrent
27 Loans Payable, Current [Roll Up] [Abstract]

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 us-gaap:LoansPayableCurrentAbstract
28 Loans Payable to Bank, Current [Concept] Monetary As Of Credit us-gaap:LoansPayableToBankCurrent
29 Other Loans Payable, Current [Concept] Monetary As Of Credit us-gaap:OtherLoansPayableCurrent
30 Loans Payable, Current, Total [Concept] Monetary As Of Credit us-gaap:LoansPayableCurrent
31 Notes and Loans Payable, Current, Total [Concept] Monetary As Of Credit us-gaap:NotesAndLoansPayableCurrent
32 Special Assessment Bond, Current [Concept] Monetary As Of Credit us-gaap:SpecialAssessmentBondCurrent
33 Long-term Federal Home Loan Bank Advances, Current [Concept] Monetary As Of Credit us-gaap:FederalHomeLoanBankAdvancesCurrent
34 Borrowings under Guaranteed Investment Agreements [Concept] Monetary As Of Credit us-gaap:BorrowingsUnderGuaranteedInvestmentAgreements
35 Other Long-term Debt, Current [Concept] Monetary As Of Credit us-gaap:OtherLongTermDebtCurrent
36 Long-term Debt, Current Maturities, Total [Concept] Monetary As Of Credit us-gaap:LongTermDebtCurrent
37 Long-term Debt, Excluding Current Maturities [Roll Up] [Abstract]

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 us-gaap:LongTermDebtNoncurrentAbstract
38 Long-term Line of Credit, Noncurrent [Concept] Monetary As Of Credit us-gaap:LongTermLineOfCredit
39 Secured Long-term Debt, Noncurrent [Concept] Monetary As Of Credit us-gaap:SecuredLongTermDebt
40 Unsecured Long-term Debt, Noncurrent [Concept] Monetary As Of Credit us-gaap:UnsecuredLongTermDebt
41 Convertible Debt, Noncurrent [Concept] Monetary As Of Credit us-gaap:ConvertibleDebtNoncurrent
42 Subordinated Long-term Debt, Noncurrent [Concept] Monetary As Of Credit us-gaap:SubordinatedLongTermDebt
43 Convertible Subordinated Debt, Noncurrent [Concept] Monetary As Of Credit us-gaap:ConvertibleSubordinatedDebtNoncurrent
44 Long-term Commercial Paper, Noncurrent [Concept] Monetary As Of Credit us-gaap:CommercialPaperNoncurrent
45 Long-term Construction Loan, Noncurrent [Concept] Monetary As Of Credit us-gaap:ConstructionLoanNoncurrent
46 Long-term Transition Bond, Noncurrent [Concept] Monetary As Of Credit us-gaap:LongTermTransitionBond
47 Long-term Pollution Control Bond, Noncurrent [Concept] Monetary As Of Credit us-gaap:LongTermPollutionControlBond
48 Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Noncurrent [Concept] Monetary As Of Credit us-gaap:JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustNoncurrent
49 Notes and Loans, Noncurrent [Roll Up] [Abstract]

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 us-gaap:LongTermNotesAndLoansAbstract
50 Notes Payable, Noncurrent [Roll Up] [Abstract]

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 us-gaap:LongTermNotesPayableAbstract
51 Medium-term Notes, Noncurrent [Concept] Monetary As Of Credit us-gaap:MediumtermNotesNoncurrent
52 Junior Subordinated Notes, Noncurrent [Concept] Monetary As Of Credit us-gaap:JuniorSubordinatedLongTermNotes
53 Senior Notes, Noncurrent [Concept] Monetary As Of Credit us-gaap:SeniorLongTermNotes
54 Convertible Notes Payable, Noncurrent [Concept] Monetary As Of Credit us-gaap:ConvertibleLongTermNotesPayable
55 Notes Payable to Bank, Noncurrent [Concept] Monetary As Of Credit us-gaap:NotesPayableToBankNoncurrent
56 Other Notes Payable, Noncurrent [Concept] Monetary As Of Credit us-gaap:OtherLongTermNotesPayable
57 Notes Payable, Noncurrent, Total [Concept] Monetary As Of Credit us-gaap:LongTermNotesPayable
58 Loans Payable, Noncurrent [Roll Up] [Abstract]

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 us-gaap:LongTermLoansPayableAbstract
59 Loans Payable to Bank, Noncurrent [Concept] Monetary As Of Credit us-gaap:LongTermLoansFromBank
60 Other Loans Payable, Long-term, Noncurrent [Concept] Monetary As Of Credit us-gaap:OtherLoansPayableLongTerm
61 Loans Payable, Noncurrent, Total [Concept] Monetary As Of Credit us-gaap:LongTermLoansPayable
62 Notes and Loans, Noncurrent, Total [Concept] Monetary As Of Credit us-gaap:LongTermNotesAndLoans
63 Special Assessment Bond, Noncurrent [Concept] Monetary As Of Credit us-gaap:SpecialAssessmentBondNoncurrent
64 Long-term Federal Home Loan Bank Advances, Noncurrent [Concept] Monetary As Of Credit us-gaap:LongtermFederalHomeLoanBankAdvancesNoncurrent
65 Other Long-term Debt, Noncurrent [Concept] Monetary As Of Credit us-gaap:OtherLongTermDebtNoncurrent
66 Long-term Debt, Excluding Current Maturities, Total [Concept] Monetary As Of Credit us-gaap:LongTermDebtNoncurrent
67 Long-term Debt, Total [Concept] Monetary As Of Credit us-gaap:LongTermDebt
68 Long-term Debt, by Type, Current and Noncurrent [Roll Up] [Abstract]

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 us-gaap:LongTermDebtByComponentsCurrentAndNoncurrentAlternativeAbstract
69 Long-term Line of Credit [Roll Up] [Abstract]

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 us-gaap:LongtermLineOfCreditCurrentAndNoncurrentAbstract
70 Line of Credit, Current [Concept] Monetary As Of Credit us-gaap:LinesOfCreditCurrent
71 Long-term Line of Credit, Noncurrent [Concept] Monetary As Of Credit us-gaap:LongTermLineOfCredit
72 Long-term Line of Credit, Total [Concept] Monetary As Of Credit us-gaap:LineOfCredit
73 Secured Debt [Roll Up] [Abstract]

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 us-gaap:SecuredLongtermDebtCurrentAndNoncurrentAbstract
74 Secured Debt, Current [Concept] Monetary As Of Credit us-gaap:SecuredDebtCurrent
75 Secured Long-term Debt, Noncurrent [Concept] Monetary As Of Credit us-gaap:SecuredLongTermDebt
76 Secured Debt, Total [Concept] Monetary As Of Credit us-gaap:SecuredDebt
77 Unsecured Debt [Roll Up] [Abstract]

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 us-gaap:UnsecuredLongtermDebtCurrentAndNoncurrentAbstract
78 Unsecured Debt, Current [Concept] Monetary As Of Credit us-gaap:UnsecuredDebtCurrent
79 Unsecured Long-term Debt, Noncurrent [Concept] Monetary As Of Credit us-gaap:UnsecuredLongTermDebt
80 Unsecured Debt, Total [Concept] Monetary As Of Credit us-gaap:UnsecuredDebt
81 Convertible Debt [Roll Up] [Abstract]

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 us-gaap:LongtermConvertibleDebtCurrentAndNoncurrentAbstract
82 Convertible Debt, Current [Concept] Monetary As Of Credit us-gaap:ConvertibleDebtCurrent
83 Convertible Debt, Noncurrent [Concept] Monetary As Of Credit us-gaap:ConvertibleDebtNoncurrent
84 Convertible Debt, Total [Concept] Monetary As Of Credit us-gaap:ConvertibleDebt
85 Subordinated Debt [Roll Up] [Abstract]

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 us-gaap:SubordinatedLongtermDebtCurrentAndNoncurrentAbstract
86 Subordinated Debt, Current [Concept] Monetary As Of Credit us-gaap:SubordinatedDebtCurrent
87 Subordinated Long-term Debt, Noncurrent [Concept] Monetary As Of Credit us-gaap:SubordinatedLongTermDebt
88 Subordinated Debt, Total [Concept] Monetary As Of Credit us-gaap:SubordinatedDebt
89 Convertible Subordinated Debt [Roll Up] [Abstract]

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 us-gaap:ConvertibleSubordinatedDebtCurrentAndNoncurrentAbstract
90 Convertible Subordinated Debt, Current [Concept] Monetary As Of Credit us-gaap:ConvertibleSubordinatedDebtCurrent
91 Convertible Subordinated Debt, Noncurrent [Concept] Monetary As Of Credit us-gaap:ConvertibleSubordinatedDebtNoncurrent
92 Convertible Subordinated Debt, Total [Concept] Monetary As Of Credit us-gaap:ConvertibleSubordinatedDebt
93 Long-term Commercial Paper [Roll Up] [Abstract]

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 us-gaap:LongtermCommercialPaperCurrentAndNoncurrentAbstract
94 Long-term Commercial Paper, Current [Concept] Monetary As Of Credit us-gaap:LongTermCommercialPaperCurrent
95 Long-term Commercial Paper, Noncurrent [Concept] Monetary As Of Credit us-gaap:CommercialPaperNoncurrent
96 Long-term Commercial Paper, Total [Concept] Monetary As Of Credit us-gaap:LongtermCommercialPaperCurrentAndNoncurrent
97 Long-term Construction Loan [Roll Up] [Abstract]

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 us-gaap:LongtermConstructionLoanCurrentAndNoncurrentAbstract
98 Long-term Construction Loan, Current [Concept] Monetary As Of Credit us-gaap:LongTermConstructionLoanCurrent
99 Long-term Construction Loan, Noncurrent [Concept] Monetary As Of Credit us-gaap:ConstructionLoanNoncurrent
100 Long-term Construction Loan, Total [Concept] Monetary As Of Credit us-gaap:LongtermConstructionLoanCurrentAndNoncurrent
101 Long-term Transition Bond [Roll Up] [Abstract]

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 us-gaap:LongtermTransitionBondCurrentAndNoncurrentAbstract
102 Long-term Transition Bond, Current [Concept] Monetary As Of Credit us-gaap:LongtermTransitionBondCurrent
103 Long-term Transition Bond, Noncurrent [Concept] Monetary As Of Credit us-gaap:LongTermTransitionBond
104 Long-term Transition Bond, Total [Concept] Monetary As Of Credit us-gaap:LongtermTransitionBondCurrentAndNoncurrent
105 Long-term Pollution Control Bond [Roll Up] [Abstract]

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 us-gaap:LongtermPollutionControlBondCurrentAndNoncurrentAbstract
106 Long-term Pollution Control Bond, Current [Concept] Monetary As Of Credit us-gaap:LongtermPollutionControlBondCurrent
107 Long-term Pollution Control Bond, Noncurrent [Concept] Monetary As Of Credit us-gaap:LongTermPollutionControlBond
108 Long-term Pollution Control Bond, Total [Concept] Monetary As Of Credit us-gaap:LongtermPollutionControlBondCurrentAndNoncurrent
109 Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Roll Up] [Abstract]

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 us-gaap:JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustAbstract
110 Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Current [Concept] Monetary As Of Credit us-gaap:JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustCurrent
111 Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Noncurrent [Concept] Monetary As Of Credit us-gaap:JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustNoncurrent
112 Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Total [Concept] Monetary As Of Credit us-gaap:JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
113 Long-term Notes and Loans, by Type, Current and Noncurrent [Roll Up] [Abstract]

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 us-gaap:LongtermNotesAndLoansByTypeCurrentAndNoncurrentAbstract
114 Notes Payable, by Type, Current and Noncurrent [Roll Up] [Abstract]

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 us-gaap:LongtermNotesPayableCurrentAndNoncurrentAbstract
115 Medium-term Notes [Roll Up] [Abstract]

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 us-gaap:MediumtermNotesAbstract
116 Medium-term Notes, Current [Concept] Monetary As Of Credit us-gaap:MediumtermNotesCurrent
117 Medium-term Notes, Noncurrent [Concept] Monetary As Of Credit us-gaap:MediumtermNotesNoncurrent
118 Medium-term Notes, Total [Concept] Monetary As Of Credit us-gaap:MediumTermNotes
119 Junior Subordinated Notes [Roll Up] [Abstract]

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 us-gaap:JuniorSubordinatedLongtermNotesCurrentAndNoncurrentAbstract
120 Junior Subordinated Notes, Current [Concept] Monetary As Of Credit us-gaap:JuniorSubordinatedNotesCurrent
121 Junior Subordinated Notes, Noncurrent [Concept] Monetary As Of Credit us-gaap:JuniorSubordinatedLongTermNotes
122 Junior Subordinated Notes, Total [Concept] Monetary As Of Credit us-gaap:JuniorSubordinatedNotes
123 Senior Notes [Roll Up] [Abstract]

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 us-gaap:SeniorLongtermNotesCurrentAndNoncurrentAbstract
124 Senior Notes, Current [Concept] Monetary As Of Credit us-gaap:SeniorNotesCurrent
125 Senior Notes, Noncurrent [Concept] Monetary As Of Credit us-gaap:SeniorLongTermNotes
126 Senior Notes, Total [Concept] Monetary As Of Credit us-gaap:SeniorNotes
127 Convertible Notes Payable [Roll Up] [Abstract]

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 us-gaap:ConvertibleLongtermNotesPayableCurrentAndNoncurrentAbstract
128 Convertible Notes Payable, Current [Concept] Monetary As Of Credit us-gaap:ConvertibleNotesPayableCurrent
129 Convertible Notes Payable, Noncurrent [Concept] Monetary As Of Credit us-gaap:ConvertibleLongTermNotesPayable
130 Convertible Notes Payable, Total [Concept] Monetary As Of Credit us-gaap:ConvertibleNotesPayable
131 Notes Payable to Bank [Roll Up] [Abstract]

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 us-gaap:NotesPayableToBankCurrentAndNoncurrentAbstract
132 Notes Payable to Bank, Current [Concept] Monetary As Of Credit us-gaap:NotesPayableToBankCurrent
133 Notes Payable to Bank, Noncurrent [Concept] Monetary As Of Credit us-gaap:NotesPayableToBankNoncurrent
134 Notes Payable to Bank, Total [Concept] Monetary As Of Credit us-gaap:NotesPayableToBank
135 Other Notes Payable [Roll Up] [Abstract]

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 us-gaap:OtherLongtermNotesPayableCurrentAndNoncurrentAbstract
136 Other Notes Payable, Current [Concept] Monetary As Of Credit us-gaap:OtherNotesPayableCurrent
137 Other Notes Payable, Noncurrent [Concept] Monetary As Of Credit us-gaap:OtherLongTermNotesPayable
138 Other Notes Payable, Total [Concept] Monetary As Of Credit us-gaap:OtherNotesPayable
139 Notes Payable, Total [Concept] Monetary As Of Credit us-gaap:NotesPayable
140 Loans Payable, by Type, Current and Noncurrent [Roll Up] [Abstract]

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 us-gaap:LongtermLoansPayableCurrentAndNoncurrentAbstract
141 Loans Payable to Bank [Roll Up] [Abstract]

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 us-gaap:LongtermLoansPayableToBankCurrentAndNoncurrentAbstract
142 Loans Payable to Bank, Current [Concept] Monetary As Of Credit us-gaap:LoansPayableToBankCurrent
143 Loans Payable to Bank, Noncurrent [Concept] Monetary As Of Credit us-gaap:LongTermLoansFromBank
144 Loans Payable to Bank, Total [Concept] Monetary As Of Credit us-gaap:LoansPayableToBank
145 Other Loans Payable [Roll Up] [Abstract]

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 us-gaap:OtherLongtermLoansPayableCurrentAndNoncurrentAbstract
146 Other Loans Payable, Current [Concept] Monetary As Of Credit us-gaap:OtherLoansPayableCurrent
147 Other Loans Payable, Long-term, Noncurrent [Concept] Monetary As Of Credit us-gaap:OtherLoansPayableLongTerm
148 Other Loans Payable, Total [Concept] Monetary As Of Credit us-gaap:OtherLoansPayable
149 Loans Payable, Total [Concept] Monetary As Of Credit us-gaap:LoansPayable
150 Notes and Loans Payable, Total [Concept] Monetary As Of Credit us-gaap:NotesAndLoansPayable
151 Special Assessment Bond [Roll Up] [Abstract]

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 us-gaap:SpecialAssessmentBondCurrentAndNoncurrentAbstract
152 Special Assessment Bond, Current [Concept] Monetary As Of Credit us-gaap:SpecialAssessmentBondCurrent
153 Special Assessment Bond, Noncurrent [Concept] Monetary As Of Credit us-gaap:SpecialAssessmentBondNoncurrent
154 Special Assessment Bond, Total [Concept] Monetary As Of Credit us-gaap:SpecialAssessmentBond
155 Long-term Federal Home Loan Bank Advances [Roll Up] [Abstract]

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 us-gaap:LongtermFederalHomeLoanBankAdvancesAbstract
156 Long-term Federal Home Loan Bank Advances, Current [Concept] Monetary As Of Credit us-gaap:FederalHomeLoanBankAdvancesCurrent
157 Long-term Federal Home Loan Bank Advances, Noncurrent [Concept] Monetary As Of Credit us-gaap:LongtermFederalHomeLoanBankAdvancesNoncurrent
158 Long-term Federal Home Loan Bank Advances, Total [Concept] Monetary As Of Credit us-gaap:FederalHomeLoanBankAdvancesLongTerm
159 Borrowings under Guaranteed Investment Agreements [Concept] Monetary As Of Credit us-gaap:BorrowingsUnderGuaranteedInvestmentAgreements
160 Other Long-term Debt [Roll Up] [Abstract]

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 us-gaap:OtherLongtermDebtCurrentAndNoncurrentAbstract
161 Other Long-term Debt, Current [Concept] Monetary As Of Credit us-gaap:OtherLongTermDebtCurrent
162 Other Long-term Debt, Noncurrent [Concept] Monetary As Of Credit us-gaap:OtherLongTermDebtNoncurrent
163 Other Long-term Debt, Total [Concept] Monetary As Of Credit us-gaap:OtherLongTermDebt
164 Long-term Debt, Total [Concept] Monetary As Of Credit us-gaap:LongTermDebt
165 Loans Payable, Current and Noncurrent [Roll Up] [Abstract]

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 us-gaap:LongtermLoansPayableByCurrentAndNoncurrentAbstract
166 Loans Payable, Current [Concept] Monetary As Of Credit us-gaap:LoansPayableCurrent
167 Loans Payable, Noncurrent [Concept] Monetary As Of Credit us-gaap:LongTermLoansPayable
168 Loans Payable, Total [Concept] Monetary As Of Credit us-gaap:LoansPayable
169 Notes Payable, Current and Noncurrent [Roll Up] [Abstract]

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 us-gaap:LongtermNotesPayableCurrentAndNoncurrentTotalAbstract
170 Notes Payable, Current [Concept] Monetary As Of Credit us-gaap:NotesPayableCurrent
171 Notes Payable, Noncurrent [Concept] Monetary As Of Credit us-gaap:LongTermNotesPayable
172 Notes Payable, Total [Concept] Monetary As Of Credit us-gaap:NotesPayable
173 Notes and Loans Payable, Current and Noncurrent [Roll Up] [Abstract]

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 us-gaap:LongtermNotesAndLoansCurrentAndNoncurrentAbstract
174 Notes and Loans Payable, Current [Concept] Monetary As Of Credit us-gaap:NotesAndLoansPayableCurrent
175 Notes and Loans, Noncurrent [Concept] Monetary As Of Credit us-gaap:LongTermNotesAndLoans
176 Notes and Loans Payable, Total [Concept] Monetary As Of Credit us-gaap:NotesAndLoansPayable
177 Long-term Debt, Current and Noncurrent [Roll Up] [Abstract]

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 us-gaap:LongtermDebtCurrentAndNoncurrentAbstract
178 Long-term Debt, Current Maturities [Concept] Monetary As Of Credit us-gaap:LongTermDebtCurrent
179 Long-term Debt, Excluding Current Maturities [Concept] Monetary As Of Credit us-gaap:LongTermDebtNoncurrent
180 Long-term Debt, Total [Concept] Monetary As Of Credit us-gaap:LongTermDebt