Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets
Net operating loss and tax credit carryforwards	$ 187	$ 176
Capitalized research and development	377	122
Legal reserve	15	42
Other accruals and reserves	12	21
Stock-based compensation	257	30
Operating lease liabilities	11	13
Other	0	3
Total gross deferred tax assets	859	407
Less: valuation allowance	(3)	(2)
Total deferred tax assets, net of valuation allowance	856	405
Deferred tax liabilities
Property and equipment and intangible assets	(17)	(24)
Operating lease right-of-use assets	(9)	(10)
Total deferred tax liabilities	(26)	(34)
Deferred tax assets, net	$ 830	$ 371