Income Taxes - Composition of Net Deferred Tax Asset by Jurisdiction (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Line Items]
Deferred tax assets	$ 3,423	$ 3,240
Valuation allowance	(2,734)	$ (2,595)	$ (2,333)	$ (2,062)
Deferred tax liabilities	(405)
Total	284
Domestic [Member]
Income Tax Disclosure [Line Items]
Deferred tax assets	1,090
Valuation allowance	(1,022)
Deferred tax liabilities	(68)
Total	0
Foreign [Member]
Income Tax Disclosure [Line Items]
Deferred tax assets	2,333
Valuation allowance	(1,712)
Deferred tax liabilities	(337)
Total	$ 284