Income Taxes - Accounting for Uncertainty in Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes
Unrecognized Tax Benefits, Beginning Balance	$ 27	$ 33	$ 35
Decrease for tax positions of prior years			(1)
Decrease for statute of limitation expiration	(17)	(6)	(1)
Unrecognized Tax Benefits, Ending Balance	$ 10	$ 27	$ 33