Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income applicable to common shareholders	$ 60	$ 147	$ 113	$ 296
Weighted Average Shares
Weighted average common shares outstanding (in shares)	53,269,631	52,763,868	53,244,886	52,719,959
Effect of dilutive securities
Stock-based awards (in shares)	265,817	772,801	311,721	697,937
Weighted average diluted common shares (in shares)	53,535,448	53,536,669	53,556,607	53,417,896
Earnings per common share
Basic earnings per common share (in dollars per share)	$ 1.13	$ 2.78	$ 2.12	$ 5.61
Effect of dilutive securities
Stock-based awards (in dollars per share)	(0.01)	(0.04)	(0.01)	(0.07)
Diluted earnings per common share (in dollars per share)	$ 1.12	$ 2.74	$ 2.11	$ 5.54