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Earnings Per Common Share (Schedule Of Net Income (Loss) Per Common Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Common Share [Abstract]        
Net income (loss) $ (319) $ (73) $ 101 $ 948
Less: dividends declared-common shares and unvested common shares (65) (61) (191) (186)
Undistributed earnings $ (384) $ (135) $ (90) $ 763
Percentage allocated to common shareholders 100.00% 100.00% 98.70% 98.70%
Net income (loss) available to common stockholders, total $ (384) $ (135) $ (88) $ 752
Add: dividends declared-common shareholders 65 61 188 183
Numerator for basic and diluted earnings per common share $ (319) $ (73) $ 100 $ 936
Denominator for basic earnings per weighted-average common shares 38.8 39.2 38.8 39.4
Effect of dilutive securities: Options
Denominator for diluted earnings per adjusted weighted-average common shares 38.8 39.2 38.8 39.5
Per common share net income (loss): Basic $ (8.22) $ (1.88) $ 2.57 $ 23.74
Per common share net income (loss): Diluted $ (8.22) $ (1.88) $ 2.57 $ 23.72
Basic weighted-average common shares outstanding 38.8 39.2 38.8 39.4
Basic weighted-average common shares outstanding and unvested common shares expected to vest 38.8 39.2 39.4 39.9