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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net increase to other comprehensive income or loss upon the translation $ (339) $ (310) $ (650) $ (248)
Changes in derivative financial instruments, net of tax (19) (99) 7 (110)
Changes in derivative financial instruments, tax $ 5 $ 38 $ 8 $ 42