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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2015
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss), Beginning balance $ (834)
Accumulated other comprehensive income (loss) before reclassifications (392)
Amounts reclassified from accumulated other comprehensive income (loss) 107
Accumulated other comprehensive income (loss), Ending balance (1,119)
Currency Translation Adjustments [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss), Beginning balance (515)
Accumulated other comprehensive income (loss) before reclassifications (311)
Accumulated other comprehensive income (loss), Ending balance (826)
Derivative Financial Instruments, Net of Tax [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss), Beginning balance (228)
Accumulated other comprehensive income (loss) before reclassifications (81)
Amounts reclassified from accumulated other comprehensive income (loss) 107
Accumulated other comprehensive income (loss), Ending balance (202)
Defined Benefit Plans, Net of Tax [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss), Beginning balance (91)
Accumulated other comprehensive income (loss) before reclassifications 0
Amounts reclassified from accumulated other comprehensive income (loss) 0
Accumulated other comprehensive income (loss), Ending balance $ (91)