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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Accumulated net unrealized losses on investment securities:      
Balance at beginning of period, net of tax $ (2,319) $ (99)  
Net unrealized holding gains (losses) arising during the period 309 (965)  
Less: Provision (benefit) for income taxes 73 (227)  
Change in net unrealized losses on investment securities, net of tax 236 (738)  
Balance at end of period, net of tax (2,083) (837)  
Accumulated net losses on cash flow hedges:      
Balance at beginning of period, net of tax (942) 55  
Net cash flow hedge gains (losses) arising during the period 316 (271)  
Less: Provision (benefit) for income taxes 74 (64)  
Change in net cash flow hedge losses arising during the period, net of tax 242 (207)  
Net cash flow (losses) gains included in interest and fees on loans (119) 22  
Less: (Benefit) provision for income taxes (28) 5  
Reclassification adjustment for net cash flow hedge (losses) gains included in net income, net of tax (91) 17  
Change in net cash flow hedge losses, net of tax 333 (224)  
Balance at end of period, net of tax [1] (609) (169)  
Accumulated defined benefit pension and other postretirement plans adjustment:      
Balance at beginning of period, net of tax (481) (168)  
Amortization of actuarial net loss 9 7  
Amortization of prior service credit (6) (6)  
Total amounts recognized in other noninterest expenses 3 1  
Less: Provision for income taxes 1 0  
Adjustment for amounts recognized as components of net periodic benefit credit during the period, net of tax 2 1  
Change in defined benefit pension and other postretirement plans adjustment, net of tax 2 1  
Balance at end of period, net of tax (479) (167)  
Total accumulated other comprehensive loss at end of period, net of tax (3,171) $ (1,173) $ (3,742)
Cash flow hedge gain (loss) to be reclassified within 12 months $ (381)    
[1] The Corporation expects to reclassify $381 million of losses, net of tax, from accumulated other comprehensive loss to earnings over the next twelve months if interest yield curves and notional amounts remain at March 31, 2023 levels.