Shares and Stockholders' Equity (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Deferred compensation plan mark to market adjustment	$ 3	$ 1
Preferred stock shares issued	40,000		40,000
9.250% Fixed Rate Reset Non-Cumulative Preferred Stock, Series C [Member]
Preferred stock shares issued	20,000		20,000
9.000% Non-Cumulative Preferred Stock, Series D [Member]
Preferred stock shares issued	20,000		20,000
Series C Preferred Stock Depositary Shares [Member] | 9.250% Fixed Rate Reset Non-Cumulative Preferred Stock, Series C [Member]
Percent of non cumulative preferred stock	9.25%		9.25%
Series D Depositary Shares [Member] | 9.000% Non-Cumulative Preferred Stock, Series D [Member]
Percent of non cumulative preferred stock	9.00%		9.00%