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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share [Abstract]      
Net income $ 881 $ 1,151 $ 1,168
Less income allocated to participating securities 4 6 5
Preferred stock dividends 23 23 23
Net income attributable to common shares $ 854 $ 1,122 $ 1,140
Basic average common shares 132.0 131.0 135.0
Basic net income per common share $ 6.47 $ 8.56 $ 8.45
Net effect of the assumed exercise of stock awards 1.0 2.0 2.0
Diluted average common shares 133.0 133.0 137.0
Diluted net income per common share $ 6.44 $ 8.47 $ 8.35