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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]      
Net income $ 698 $ 881 $ 1,151
Less income allocated to participating securities 4 4 6
Preferred stock dividends 23 23 23
Net income attributable to common shares $ 671 $ 854 $ 1,122
Basic average common shares 133.0 132.0 131.0
Basic net income per common share $ 5.06 $ 6.47 $ 8.56
Basic average common shares 133.0 132.0 131.0
Net effect of the assumed exercise of stock awards 1.0 1.0 2.0
Diluted average common shares 134.0 133.0 133.0
Diluted net income per common share $ 5.02 $ 6.44 $ 8.47