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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Statement of Comprehensive Income [Abstract]          
Net increase to other comprehensive income or loss upon the translation $ (310) $ 154   $ (248) $ (84)
Currency translation gains reclassified from accumulated other comprehensive income (loss)     25    
Changes in derivative financial instruments, net of tax (99) 48   (110) (22)
Changes in derivative financial instruments, tax $ (38) $ 17   $ (42) $ (10)