Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Beginning balance	$ 111	$ 120	$ 133
Additions based on tax positions taken in the current year	0	0	17
Additions based on tax positions of prior years	0	0	0
Reductions based on tax positions of prior years	0	(9)	(30)
Ending balance	$ 111	$ 111	$ 120