Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amount
U.S. federal statutory tax	$ (421)	$ (1,054)	$ (1,057)
Valuation allowance	1,150	1,199	512
Research and development credits	(472)	(204)	(189)
State income tax provision, net of effects on U.S. federal tax	(75)	(90)	(94)
Tax on non-U.S. activities	35	64	47
Impact of subsidiary shares purchased from noncontrolling interests	(29)
Other provision adjustments	49	116	38
Total income tax expense/(benefit)	$ 237	$ 31	$ (743)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. federal statutory tax	21.00%	21.00%	21.00%
Valuation allowance	(57.30%)	(23.90%)	(10.20%)
Valuation allowance	23.60%	4.10%	3.80%
State income tax provision, net of effects on U.S. federal tax	3.70%	1.80%	1.90%
Tax on non-U.S. activities	(1.80%)	(1.30%)	(0.90%)
Impact of subsidiary shares purchased from noncontrolling interests	1.50%
Other provision adjustments	(2.50%)	(2.30%)	(0.90%)
Effective income tax rate	(11.80%)	(0.60%)	14.70%