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Earnings Per Common Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net income allocated to common shares $ 96 $ 146 $ 335 $ 390
Weighted average number of common shares outstanding - basic (in shares) 237,838 208,545 218,694 208,435
Effect of potentially dilutive common shares (in shares) 1,087 909 1,018 702
Weighted average number of shares outstanding, diluted (in shares) 238,925 209,454 219,712 209,137
Earnings per common share:        
Basic (in dollars per share) $ 0.40 $ 0.70 $ 1.53 $ 1.87
Diluted (in dollars per share) $ 0.40 $ 0.70 $ 1.53 $ 1.87