Income Taxes - Valuation Allowance (Details) - Valuation Allowance of Deferred Tax Assets [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 28	$ 42	$ 84
Additions charged to costs and expenses	10	8	3
Deductions	(3)	(22)	(45)
Balance at end of year	$ 35	$ 28	$ 42