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Allowance For Credit Losses (Analysis Of The Allowance For Credit Losses By Portfolio Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period $ 1,472 $ 1,416 $ 1,464 $ 1,479  
Cumulative change in accounting guidance         $ (38)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         1,426
Provision (credit) for loan losses 122 47 251 30  
Loan Losses:          
Charge-offs (112) (70) (217) (147)  
Recoveries 31 32 53 63  
Net loan losses (81) (38) (164) (84)  
Total allowance for loan losses 1,513 1,425 1,513 1,425  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 124 76 118 95  
Provision (credit) for unfunded credit losses 4 13 2 (6)  
Reserve for unfunded credit commitments, end of year 120 89 120 89  
Allowance for credit losses 1,633 1,514 1,633 1,514  
Commercial Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 693 620 665 682  
Cumulative change in accounting guidance         (3)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         662
Provision (credit) for loan losses 46 (14) 116 (63)  
Loan Losses:          
Charge-offs (52) (22) (101) (48)  
Recoveries 21 13 31 26  
Net loan losses (31) (9) (70) (22)  
Total allowance for loan losses 708 597 708 597  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 77 52 72 58  
Provision (credit) for unfunded credit losses (5) 5 10 (1)  
Reserve for unfunded credit commitments, end of year 82 57 82 57  
Allowance for credit losses 790 654 790 654  
Total Investor Real Estate [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 126 75 121 79  
Cumulative change in accounting guidance         (3)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         118
Provision (credit) for loan losses 25 15 33 11  
Loan Losses:          
Charge-offs 0 0 0 0  
Recoveries 0 1 0 1  
Net loan losses 0 1 0 1  
Total allowance for loan losses 151 91 151 91  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 27 8 21 8  
Provision (credit) for unfunded credit losses 8 2 (2) 2  
Reserve for unfunded credit commitments, end of year 19 10 19 10  
Allowance for credit losses 170 101 170 101  
Consumer Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 653 721 678 718  
Cumulative change in accounting guidance         (32)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         $ 646
Provision (credit) for loan losses 51 46 102 82  
Loan Losses:          
Charge-offs (60) (48) (116) (99)  
Recoveries 10 18 22 36  
Net loan losses (50) (30) (94) (63)  
Total allowance for loan losses 654 737 654 737  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 20 16 25 29  
Provision (credit) for unfunded credit losses 1 6 (6) (7)  
Reserve for unfunded credit commitments, end of year 19 22 19 22  
Allowance for credit losses $ 673 $ 759 $ 673 $ 759