| Line | Label | Object Class | Period Type | Balance | Name |
| 1 | 306020 - Disclosure - Note G. Part 1. Commitments | [Network] | http://www.abc.com/role/Commitments | ||
| 2 | Commitments [Table] | [Table] | abc:CommitmentsTable | ||
| 3 | Report Date [Axis] | [Axis] | us-gaap:CreationDateAxis | ||
| 4 | Financial Statements Date [Domain] | [Domain] | us-gaap:DefaultFinancialStatementsDateMember | ||
| 5 | As Reported February 12, 2011 [Member] | [Member] | For Period | abc:AsReportedFebruary122011Member | |
| 6 | Legal Entity [Axis] | [Axis] | dei:LegalEntityAxis | ||
| 7 | Consolidated Entity [Domain] | [Domain] | dei:EntityDomain | ||
| 8 | Commitments [Line Items] | [Line Items] | abc:CommitmentsLineItems | ||
| 9 | Commitments Disclosure [Text Block] | [Concept] Text Block (HTML) | For Period | us-gaap:CommitmentsDisclosureTextBlock |