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Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Before Reclassifications Associated With the Effective Portion of Derivatives Designated as Cash Flow Hedges (Detail) - Derivative Instruments [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) on derivatives before tax $ (11) $ 50 $ 10
Tax (provision) benefit 4 (20) (4)
Net of tax (provision) benefit (7) 30 6
Interest Rate Swaps [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) on derivatives before tax     (8)
Foreign Currency Derivatives [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) on derivatives before tax $ (11) $ 50 23
Electricity Commodity Derivatives [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) on derivatives before tax     $ (5)