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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, 2025
Mar. 31, 2024
Earnings Per Share [Abstract]    
Net income $ 172 $ 138
Income allocated to participating securities 1 1
Preferred stock dividends 6 6
Net income attributable to common shares $ 165 $ 131
Basic average common shares (in shares) 132.0 132.0
Basic net income per common share (in dollars per share) $ 1.26 $ 0.99
Basic average common shares (in shares) 132.0 132.0
Net effect of the assumed exercise of stock awards (in shares) 1.0 1.0
Diluted average common shares (in shares) 133.0 133.0
Diluted net income per common share (in dollars per share) $ 1.25 $ 0.98