Income Taxes - Reconciliation Rollforward of Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of gross unrecognized tax benefits
Beginning balance	$ 138	$ 125	$ 110
Additions for tax positions related to the current year	26	12	21
Reductions for tax positions related to the current year	(3)	(1)	(1)
Additions for tax positions of prior years	80	5	5
Reductions for tax positions of prior years	(85)	(1)	(8)
Reductions due to lapse of statutes of limitations	(5)	0	(1)
Audit settlements	(1)	(2)	(1)
Ending balance	150	138	125
Unrecognized tax benefits, net of federal tax benefits, that would affect the effective tax rate if recognized	120	106	95
Estimated decrease in gross amount of unrecognized tax benefits reasonably possible in next 12 months	25
Interest and penalties related to unrecognized tax benefits
Interest and penalties expense (credit)	12	4	$ 0
Payable related to accrued interest and penalties	$ 26	$ 14