Income Taxes - Deferred Taxes Included in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Taxes.
Other assets	$ 107	$ 117
Deferred taxes	(86)	(84)
Net deferred taxes	21	$ 33
Deferred tax benefit associated with reduction in valuation allowance	93
Deferred tax benefit associated with reduction in valuation allowance allocated to income from continuing operations	89
Deferred tax benefit associated with reduction in valuation allowance allocated to other comprehensive income	$ 4