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Summary Of Significant Accounting Policies (Net Income (Loss) Per Common Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Summary Of Significant Accounting Policies [Abstract]      
Net income (loss) $ 597 $ 1,379 $ 514
Less: dividends declared-common shares and unvested common shares (255) (247) (249)
Undistributed earnings $ 342 $ 1,132 $ 265
Percentage Allocated To Common Shareholders 98.70% 98.70% 98.70%
Net income (loss) available to common stockholders, total $ 337 $ 1,117 $ 262
Add: dividends declared-common shareholders 252 244 246
Numerator for basic and diluted earnings per common share $ 589 $ 1,361 $ 508
Denominator for basic earnings per weighted-average common shares 39 39 40
Effect of dilutive securities: Options
Denominator for diluted earnings per adjusted weighted-average common shares 39 39 40
Basic $ 15.19 $ 34.66 $ 12.81
Diluted $ 15.19 $ 34.62 $ 12.78
Basic weighted-average common shares outstanding 39 39 40
Basic weighted-average common shares outstanding and unvested common shares expected to vest 39 40 40