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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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]        
Net income $ 251 $ 351 $ 848 $ 801
Income allocated to participating securities 1 2 4 4
Preferred stock dividends 6 6 17 17
Net income attributable to common shares $ 244 $ 343 $ 827 $ 780
Basic average common shares (in shares) 132.0 131.0 132.0 131.0
Basic net income per common share (in dollars per share) $ 1.85 $ 2.63 $ 6.27 $ 5.96
Basic average common shares (in shares) 132.0 131.0 132.0 131.0
Net effect of the assumed exercise of stock awards (in shares) 1.0 1.0 1.0 2.0
Diluted average common shares (in shares) 133.0 132.0 133.0 133.0
Diluted net income per common share (in dollars per share) $ 1.84 $ 2.60 $ 6.24 $ 5.88