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Variable Interest Entities (VIEs) (Impact Of VIEs On The Consolidated Statements Of Comprehensive Income) (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
Variable Interest Entity [Line Items]                      
Other noninterest income                 $ 99 $ 91 $ 77
Provision (benefit) for income taxes $ 61 $ 70 $ 93 $ 98 $ 65 $ 50 $ 28 $ (19) 322 124 [2] 336 [2]
Variable Interest Entity                      
Variable Interest Entity [Line Items]                      
Other noninterest income                 1 1 2
Provision (benefit) for income taxes                 (14) (12) (10)
Low income housing tax credits | Variable Interest Entity                      
Variable Interest Entity [Line Items]                      
Provision for income taxes, amortization of LIHTC investments                 71 67 65
Provision for income taxes, affordable housing tax credits and other tax benefits                 (68) (63) (62)
Other tax benefits related to tax credit entities | Variable Interest Entity                      
Variable Interest Entity [Line Items]                      
Provision for income taxes, affordable housing tax credits and other tax benefits                 $ (17) $ (16) $ (13)
[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.