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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative Instruments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income, tax $ 0 $ (4)
Amounts reclassified from accumulated other comprehensive loss, tax 1  
Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income, tax 1  
Amounts reclassified from accumulated other comprehensive loss, tax 0  
Foreign Currency Translation Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income, tax 0  
Amounts reclassified from accumulated other comprehensive loss, tax 0  
Post - Retirement Benefit Obligation [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income, tax 0  
Amounts reclassified from accumulated other comprehensive loss, tax $ 0