Income Taxes - Deferred Tax Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred tax valuation allowance, rollfoward
Balance at beginning of year	$ 83
Balance at end of year	115	$ 83
Deferred tax asset valuation allowance
Deferred tax valuation allowance, rollfoward
Balance at beginning of year	83	94	$ 90
Charged to Income tax expense	32	(11)	4
Balance at end of year	$ 115	$ 83	$ 94