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Basis of Presentation and Accounting Policies (Change in Accounting Principle - Consolidated Statements of Comprehensive Income) (Details) - USD ($)
$ / shares in Units, $ 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
Other noninterest expenses                 $ 39 $ 66 $ 75
Provision (benefit) for income taxes $ 61 $ 70 $ 93 $ 98 $ 65 $ 50 $ 28 $ (19) 322 124 [2] 336 [2]
Net income (loss) $ 228 $ 262 $ 328 $ 350 $ 221 $ 217 $ 118 $ (59) $ 1,168 $ 497 [2] $ 1,202 [2]
Basic earnings per common share $ 1.69 $ 1.92 $ 2.35 $ 2.46 $ 1.54 $ 1.49 $ 0.85 $ (0.42) $ 8.45 $ 3.45 $ 7.98
Diluted earnings per common share $ 1.66 $ 1.90 $ 2.32 $ 2.43 $ 1.53 $ 1.48 $ 0.84 $ (0.42) $ 8.35 $ 3.43 $ 7.90
Accounting change impact                      
Other noninterest expenses                 $ (18) $ (30) $ (6)
Provision (benefit) for income taxes                 4 7 2
Net income (loss)                 $ 14 $ 23 $ 4
Basic earnings per common share                 $ 0.10 $ 0.16 $ 0.03
Diluted earnings per common share                 $ 0.11 $ 0.16 $ 0.03
Previously Reported                      
Other noninterest expenses                   $ 96 $ 81
Provision (benefit) for income taxes                   117 334
Net income (loss)                   $ 474 $ 1,198
Basic earnings per common share                   $ 3.29 $ 7.95
Diluted earnings per common share                   $ 3.27 $ 7.87
[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.