Income Taxes - Deferred Tax Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred tax valuation allowance, rollfoward
Balance at beginning of year	$ 115
Balance at end of year	146	$ 115
Deferred tax asset valuation allowance
Deferred tax valuation allowance, rollfoward
Balance at beginning of year	115	83	$ 94
Charged to Income tax expense	31	32	(11)
Balance at end of year	$ 146	$ 115	$ 83