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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Unrecognized tax benefit at beginning of year	$ 98	$ 132	$ 78
Gross increase for current period tax positions		15	10
Gross increase for tax positions in prior years	10	31	64
Gross decrease for tax positions in prior years	(60)	(10)	(14)
Cash Settlements	(3)	(69)
Lapse of statute of limitations	(7)	(1)	(6)
Unrecognized tax benefit at end of year	$ 38	$ 98	$ 132

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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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