Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward]
Beginning Balance	$ 28	$ 38	$ 46
Increases as a result of tax positions taken in prior years	20	6	3
Unrecognized tax benefits assumed in a business combination			4
Decreases as a result of tax positions taken in prior years	(12)	(16)	(15)
Less: Federal, state and local income tax benefits	(7)
Ending Balance	36	28	38
Net unrecognized tax benefits at December 31, 2024 that, if recognized, would impact the effective income tax rate	29
Federal, State and Local Tax
Unrecognized Tax Benefits [Roll Forward]
Beginning Balance	22	30	38
Increases as a result of tax positions taken in prior years	13	5	0
Unrecognized tax benefits assumed in a business combination			3
Decreases as a result of tax positions taken in prior years	(10)	(13)	(11)
Ending Balance	25	22	30
Accrued Interest
Unrecognized Tax Benefits [Roll Forward]
Beginning Balance	6	8	8
Increases as a result of tax positions taken in prior years	7	1	3
Unrecognized tax benefits assumed in a business combination			1
Decreases as a result of tax positions taken in prior years	(2)	(3)	(4)
Ending Balance	$ 11	$ 6	$ 8