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Fair Value Measurements - Included in Earnings (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 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 $ (302) $ 308 $ 65 $ (534)
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 (282) 306 102 (537)
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 $ (20) $ 2 $ (37) $ 3