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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Investment securities, Balance at beginning of period, net of tax $ 211 $ 65 $ (138)  
Net unrealized holding (losses) gains arising during the period (406) 191 257  
Investment securities, Less: (Benefit) provision for income taxes (96) 45 60  
Investment securities, Net unrealized holding (losses) gains arising during period, net of tax (310) 146 197  
Investment securities, Net realized losses included in net securities losses 0 0 (8)  
Investment securities, Less: Benefit for income taxes 0 0 (2)  
Investment securities, Reclassification adjustment for net securities losses included in net income, net of tax 0 0 (6)  
Investment securities, Change in net unrealized (losses) gains on investment securities, net of tax (310) 146 203  
Investment securities, Balance at end of period, net of tax (99) 211 65  
Cash flow hedges, Net (losses) gains arising during the period (35) 229 44  
Cash flow hedges, Less: (Benefit) provision for income taxes (8) 56 10  
Change in net cash flow hedge gains arising during the period, net of tax (27) 173 34  
Net cash flow hedge gains included in interest and fees on loans 95 70 0  
Benefit plans, Less: Provision for income taxes 22 18 0  
Cash flow hedges, reclassification adjustment for net cash flow hedge gains included in net income, net of tax 73 52 0  
Change in net cash flow hedges gains, net of tax (100) 121 34  
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax 55 [1] 155 [1] 34 [1] $ 0
Benefit plans, Balance at beginning of period, net of tax [2] (302) (415) (548)  
Actuarial (gain) loss [2] 159 128 157  
Prior service (cost) credit arising during the period 1 0 0  
Benefit plans, Net defined benefit pension and other postretirement plans adjustment arising during the period 160 128 157  
Cash flow hedges, Less: Provision for income taxes [2] 38 31 36  
Benefit plans, Net defined benefit pension and other postretirement adjustment arising during the period, net of tax [2] 122 97 121  
Benefit plans, Amortization of actuarial net loss [2] 40 47 42  
Benefit plans, Amortization of prior service credit (25) (27) (27)  
Benefit plans, Total amounts recognized in other noninterest expenses [2] 15 20 15  
Benefit plans, Less: Provision for income taxes [2] 3 4 3  
Benefit plans, Adjustment for amounts recognized as components of net periodic benefit cost during the period, net of tax [2] 12 16 12  
Benefit plans, Change in defined benefit pension and other postretirement plans adjustment, net of tax [2] 134 113 133  
Benefit plans, Balance at end of period, net of tax [2] (168) (302) (415)  
Total accumulated other comprehensive (loss) income at end of period, net of tax $ (212) $ 64 $ (316)  
[1] The Corporation expects to reclassify $47 million of net gains, net of tax, from accumulated other comprehensive loss to earnings over the next twelve months if interest yield curves and notional amounts remain at December 31, 2021 levels.
[2] Balances at beginning and end of period, net of tax, and changes for the years ended December 31, 2020 and 2019 have been recast to reflect the retrospective application of the Corporation's election to change the accounting method for certain components of the qualified defined benefit pension plan as of January 1, 2021. Refer to Note 1 for further information.