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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Balance beginning	$ 37	$ 40	$ 36
Additions based on tax positions related to the current year	22	5	5
Additions based on tax positions of prior years	18
Accrued interest	3	2	2
Settlements	(12)
Lapse of statute of limitations	(4)	(10)	(3)
Balance ending	64	$ 37	$ 40
Net unrecognized tax benefits that would impact effective tax rate	$ 53

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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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