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Derivative Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Income (Loss) (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]          
Accumulated other comprehensive income (loss), reclassified $ (36) $ (51) $ (120) $ (158)  
Amount of gain (loss) recognized in income on derivative (ineffective portion)     (19) (27)  
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)     $ 3 $ 1  
Scenario, Forecast [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Accumulated other comprehensive income (loss), reclassified         $ 20