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Income Taxes And Tax-Related Items Current and Deferred Components of the Provision for Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
 [1]
Sep. 30, 2020
 [1]
Jun. 30, 2020
 [1]
Mar. 31, 2020
 [1]
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]                      
Current federal income tax                 $ 212 $ 171 $ 267
Current foreign income tax                 5 5 7
Current state and local income tax                 26 30 48
Total current income tax                 243 206 322
Deferred federal income tax                 62 (73) 17
Deferred state and local income tax                 17 (9) (3)
Total deferred income tax                 79 (82) 14
Provision (benefit) for income taxes $ 61 $ 70 $ 93 $ 98 $ 65 $ 50 $ 28 $ (19) $ 322 $ 124 [2] $ 336 [2]
[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.