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Fair Value Measurements - Included in Earnings (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Gains (losses) on derivative and hedging activities, net $ 58 $ 48 $ 123 $ (487)
Gain (Loss) on Derivative Instruments [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Gains (losses) on derivative and hedging activities, net 81 50 183 (488)
Interest Expense [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Gains (losses) on derivative and hedging activities, net $ (23) $ (2) $ (60) $ 1