Income Taxes - Reconciliation of Change in Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Gross Unrecognized Tax Benefits
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 41	$ 405	$ 451
Additions for tax positions related to the current year	2	3
Additions for tax positions related to prior years	10	14	1
Reductions for tax positions related to prior years due to IRS and other settlements	(20)	(381)	(47)
Ending balance	33	41	405
Portion of balance that if recognized, would impact the effective income tax rate	27
Accrued Interest and Penalties
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	10	14	46
Additions for tax positions related to the current year	0	0
Additions for tax positions related to prior years	4	6	4
Reductions for tax positions related to prior years due to IRS and other settlements	(7)	(10)	(36)
Ending balance	7	10	14
Portion of balance that if recognized, would impact the effective income tax rate	6
Gross Tax, Interest and Penalties
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	51	419	497
Additions for tax positions related to the current year	2	3
Additions for tax positions related to prior years	14	20	5
Reductions for tax positions related to prior years due to IRS and other settlements	(27)	(391)	(83)
Ending balance	40	$ 51	$ 419
Portion of balance that if recognized, would impact the effective income tax rate	$ 33