Income Taxes - Deferred Tax Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deferred tax valuation allowance, rollfoward
Balance at beginning of year	$ 146
Balance at end of year	181	$ 146
Deferred tax asset valuation allowance
Deferred tax valuation allowance, rollfoward
Balance at beginning of year	146	115	$ 83
Charged to Income tax expense	35	31	32
Balance at end of year	$ 181	$ 146	$ 115