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Income Taxes - Reconciliation of Liabilities Associated with Uncertain Tax Provisions (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 1,393	$ 1,419	$ 1,285
Additions based on tax positions related to the current year	88	132	70
Additions for tax positions of prior years	145	58	119
Additions related to acquisitions			127
Impact of changes in exchange rates	(41)	23	(25)
Settlements with tax authorities	(22)	(41)	(45)
Reductions for tax positions of prior years	(57)	(157)	(85)
Reductions due to the lapse of the applicable statute of limitations	(73)	(41)	(27)
Balance at end of year	$ 1,433	$ 1,393	$ 1,419

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