Net Income Per Common Share (Basic And Diluted Net Income Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 1,151	$ 1,168	$ 497
Less income allocated to participating securities	6	5	2
Preferred stock dividends	23	23	13
Net income attributable to common shares	$ 1,122	$ 1,140	$ 482
Basic average common shares	131.0	135.0	139.0
Basic net income per common share	$ 8.56	$ 8.45	$ 3.45
Basic average common shares	131.0	135.0	139.0
Net effect of the assumed exercise of stock awards	2.0	2.0	1.0
Diluted average common shares	133.0	137.0	140.0
Diluted net income per common share	$ 8.47	$ 8.35	$ 3.43