Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes
Balance beginning	$ 66	$ 64	$ 64
Additions based on tax positions related to the current year	4	6	5
Acquisitions	2
Accrued interest	2	2	1
Settlements	(21)
Lapse of statute of limitations	(10)	(6)	(6)
Balance ending	43	$ 66	$ 64
Net unrecognized tax benefits that would impact effective tax rate	$ 36

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from acquisitions.

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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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- Definition

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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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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