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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Balance beginning	$ 40	$ 36	$ 109
Additions based on tax positions related to the current year	5	5	6
Additions based on tax positions of prior years			12
Accrued interest	2	2	2
Settlements			(88)
Lapse of statute of limitations	(10)	(3)	(5)
Balance ending	37	$ 40	$ 36
Net unrecognized tax benefits that would impact effective tax rate	$ 31

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Amount of unrecognized tax benefits.

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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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Amount of interest expense for an underpayment of income taxes.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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