Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equity [Abstract]
Unrealized gains (losses) on available-for-sale securities, tax portion	$ (3)	$ 1	$ 3
Foreign currency translation adjustments, income tax benefit	87	25	27
Defined benefit plans, income tax expense (benefit)	(13)	11	(59)
Change in fair value of derivative instruments, income tax expense (benefit)	8	(14)	(13)
Defined benefit plans, Expense reclassified into operations from other comprehensive income, Income tax benefits	7	12	8
Change in fair value of derivative instruments, Expense reclassified into operations from other comprehensive income, Income tax benefits	$ 40	$ 46	$ 48