Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income applicable to common shareholders	$ 73	$ 152	$ 186	$ 448
Weighted Average Shares
Weighted average common shares outstanding (in shares)	53,330,518	52,862,288	53,273,743	52,767,923
Effect of dilutive securities
Stock-based awards (in shares)	279,748	797,134	300,947	731,366
Weighted average diluted common shares (in shares)	53,610,266	53,659,422	53,574,690	53,499,289
Earnings per common share
Basic earnings per common share (in dollars per share)	$ 1.36	$ 2.87	$ 3.49	$ 8.48
Effect of dilutive securities
Stock-based awards (in dollars per share)	(0.01)	(0.04)	(0.02)	(0.11)
Diluted earnings per common share (in dollars per share)	$ 1.35	$ 2.83	$ 3.47	$ 8.37