Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 30	$ 29
Additions for tax positions related to prior years	1	5
Reductions for tax positions related to prior years	(1)	(1)
Additions based on tax positions related to the current year	1	1
Reductions related to a lapse in the statute of limitations	0	(4)
Balance at end of period	$ 31	$ 30