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Derivative Financial Instruments - Gain or Loss Recorded on Our Cash Flow Hedging Relationships (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivatives, Fair Value [Line Items]        
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) $ 0 $ 0 $ 0 $ 17
Interest rate swaps [Member]        
Derivatives, Fair Value [Line Items]        
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion), Interest Rate Swaps 0 0 0 18
Currency swaps [Member]        
Derivatives, Fair Value [Line Items]        
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion), Currency Swaps 0 0 0 (1)
Interest Expense [Member]        
Derivatives, Fair Value [Line Items]        
Gain (Loss) Reclassed From AOCI into Income (Effective Portion) 0 0 0 (7)
Interest Expense [Member] | Interest rate swaps [Member]        
Derivatives, Fair Value [Line Items]        
Gain (Loss) Reclassed from AOCI into Income (Effective Portion), Interest Rate Swaps 0 0 0 0
Interest Expense [Member] | Currency swaps [Member]        
Derivatives, Fair Value [Line Items]        
Gain (Loss) Reclassed from AOCI into Income (Effective Portion), Currency swaps 0 0 0 (7)
Derivative related income (loss) [Member]        
Derivatives, Fair Value [Line Items]        
Gain (Loss) Recognized In Income on Derivative (Ineffective Portion) 1 3 4 8
Derivative related income (loss) [Member] | Interest rate swaps [Member]        
Derivatives, Fair Value [Line Items]        
Gain (Loss) Recognized in Income on Derivative (Ineffective Portion), Interest Rate Swaps 0 0 0 0
Derivative related income (loss) [Member] | Currency swaps [Member]        
Derivatives, Fair Value [Line Items]        
Gain (Loss) Recognized in Income on Derivative (Ineffective Portion, Currency swaps) $ 1 $ 3 $ 4 $ 8