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2406406 - Disclosure - Income Taxes - Reconciliation of Gross Unrecognized Income Tax Benefits (Detail)
(http://www.spectraenergy.com/role/IncomeTaxesReconciliationOfGrossUnrecognizedIncomeTaxBenefitsDetail)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001373835 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Income Tax Disclosure [Abstract]
 
 
 
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
 
 
 
Balance at beginning of period
82,000,000  
50,000,000  
76,000,000  
Increases related to prior year tax positions
15,000,000  
10,000,000  
10,000,000  
Decreases related to prior year tax positions
(2,000,000) 
(1,000,000) 
(6,000,000) 
Increases related to current year tax positions
1,000,000  
30,000,000  
1,000,000  
Lapse of statute of limitations
(22,000,000) 
(4,000,000) 
(30,000,000) 
Foreign currency translation
1,000,000  
  
Foreign currency translation
 
(3,000,000) 
(1,000,000) 
Balance at end of period
75,000,000  
 
82,000,000  
 
50,000,000