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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Beginning balance $ (127)  
Other comprehensive income (loss) before reclassifications, net of tax 55  
Amounts reclassified from accumulated other comprehensive income, net of tax 14  
Other comprehensive income (loss), net of taxes 69 $ (73)
Accumulated Other Comprehensive Income (Loss), Ending balance (58)  
Derivative Instruments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Beginning balance (52)  
Other comprehensive income (loss) before reclassifications, net of tax (7)  
Amounts reclassified from accumulated other comprehensive income, net of tax 14  
Other comprehensive income (loss), net of taxes 7  
Accumulated Other Comprehensive Income (Loss), Ending balance (45)  
Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Beginning balance 8  
Other comprehensive income (loss) before reclassifications, net of tax 1  
Other comprehensive income (loss), net of taxes 1  
Accumulated Other Comprehensive Income (Loss), Ending balance 9  
Foreign Currency Translation Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Beginning balance (75)  
Other comprehensive income (loss) before reclassifications, net of tax 61  
Other comprehensive income (loss), net of taxes 61  
Accumulated Other Comprehensive Income (Loss), Ending balance (14)  
Post - Retirement Benefit Plans [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Beginning balance (8)  
Accumulated Other Comprehensive Income (Loss), Ending balance $ (8)