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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
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]                      
Net income (loss) $ 228 $ 262 $ 328 $ 350 $ 221 [1] $ 217 [1] $ 118 [1] $ (59) [1] $ 1,168 $ 497 [2] $ 1,202 [2]
Less income allocated to participating securities 1 1 2 1 1 0 1 0 5 2 7
Preferred stock dividends                 23 13 0
Net income attributable to common shares $ 221 $ 255 $ 321 $ 343 $ 215 [1] $ 209 [1] $ 117 [1] $ (59) [1] $ 1,140 $ 482 $ 1,195
Basic average common shares                 135.0 139.0 150.0
Basic net income per common share $ 1.69 $ 1.92 $ 2.35 $ 2.46 $ 1.54 [1] $ 1.49 [1] $ 0.85 [1] $ (0.42) [1] $ 8.45 $ 3.45 $ 7.98
Net effect of the assumed exercise of stock awards                 2.0 1.0 1.0
Diluted average common shares                 137.0 140.0 151.0
Diluted net income per common share $ 1.66 $ 1.90 $ 2.32 $ 2.43 $ 1.53 [1] $ 1.48 [1] $ 0.84 [1] $ (0.42) [1] $ 8.35 $ 3.43 $ 7.90
[1] Recast to reflect the retrospective application of the Corporation's election to change the accounting methodology for certain components of defined pension benefit credit. Refer to Note 1 for further information.
[2] See Defined Benefit Pension and Other Postretirement Costs in Note 1.