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Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized tax benefit at beginning of year	$ 132	$ 78	$ 46
Gross increase for current period tax positions	15	10	3
Gross increase for tax positions in prior years	31	64	65
Gross decrease for tax positions in prior years	(10)	(14)	(21)
Settlements	(69)		(3)
Lapse of statute of limitations	(1)	(6)	(12)
Unrecognized tax benefit at end of year	$ 98	$ 132	$ 78

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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