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Income Taxes - Reconciliation of Liabilities Associated with Uncertain Tax Provisions (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 1,433	$ 1,393	$ 1,419
Additions based on tax positions related to the current year	86	88	132
Additions for tax positions of prior years	65	145	58
Impact of changes in exchange rates	2	(41)	23
Settlements with tax authorities	(50)	(22)	(41)
Reductions for tax positions of prior years	(176)	(57)	(157)
Reductions due to the lapse of the applicable statute of limitations	(59)	(73)	(41)
Balance at end of year	$ 1,301	$ 1,433	$ 1,393

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