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Net Income Per Common Share (Basic And Diluted Net Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Earnings Per Share [Abstract]    
Net income $ 324 $ 189
Income allocated to participating securities 1 1
Preferred stock dividends 6 6
Net income attributable to common shares $ 317 $ 182
Basic average common shares (in shares) 131 131
Basic net income per common share (in dollars per share) $ 2.41 $ 1.39
Basic average common shares (in shares) 131 131
Net effect of the assumed exercise of stock awards 1 2
Diluted average common shares (in shares) 132 133
Diluted net income per common share (in dollars per share) $ 2.39 $ 1.37