Income Taxes - Reconciliation of Beginning and Ending Amount of Gross Unrecognized Tax Benefits, Excluding Interest and Penalties (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 83	$ 43	$ 47
Increases (decreases) for tax positions taken during prior years	(5)	35	0
Increases for tax positions taken during the current year	12	9	2
Reductions related to expiration of statutes of limitations and audit settlements	(4)	(4)	(6)
Balance at end of year	$ 86	$ 83	$ 43