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Accumulated Other Comprehensive Income - Other Comprehensive Income (Loss) Before Reclassifications Associated with Cash Flow Derivative Instruments (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) on derivatives before tax $ 23 $ 13 $ 44 $ (5)
Tax (expense) benefit (9) (5) (17) 2
Net of tax 14 8 27 (3)
Interest Rate Swaps [Member] | Cash Flow Hedging [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) on derivatives before tax       (8)
Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) on derivatives before tax $ 23 $ 13 $ 44 11
Electricity Commodity Derivatives [Member] | Cash Flow Hedging [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) on derivatives before tax       $ (8)