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Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Independent margin $ 57 $ 58
Fair value, derivative liabilities 488 710
Cash collateral from derivatives counterparties 399 397
Securities received from derivatives counterparties, ability to re-pledge 11 53
Cumulative counterparty credit risk valuation adjustment 5 7
Cumulative credit risk valuation adjustment related to our credit quality 1 6
Gain (net after-tax) recorded in AOCI related to derivatives designated as cash flow hedges expected to be reclassified to earnings over the next 12 months 108  
Maximum length of time over which forecasted transactions were hedged, years 5 years  
Derivatives [Member]
   
Derivatives, Fair Value [Line Items]    
Collateral posted for derivative instruments 203 371
Fair value, derivative liabilities   1
Cash Flow Hedges [Member]
   
Derivatives, Fair Value [Line Items]    
Higher remaining maturity range 2019  
Maximum [Member]
   
Derivatives, Fair Value [Line Items]    
Contingent collateral required upon credit rating falling below investment grade 1 1
Maximum [Member] | Derivatives [Member]
   
Derivatives, Fair Value [Line Items]    
Fair value, derivative liabilities $ 1