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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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period $ 1,513 $ 1,425 $ 1,464 $ 1,479  
Cumulative change in accounting guidance         $ (38)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         1,426
Provision (credit) for loan losses 135 103 386 133  
Loan Losses:          
Charge-offs (124) (135) (341) (282)  
Recoveries 23 25 76 88  
Net loan losses (101) (110) (265) (194)  
Total allowance for loan losses 1,547 1,418 1,547 1,418  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 120 89 118 95  
Provision (credit) for unfunded credit losses 10 32 12 26  
Reserve for unfunded credit commitments, end of year 130 121 130 121  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 1,677 1,539 1,677 1,539  
Commercial Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 708 597 665 682  
Cumulative change in accounting guidance         (3)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         662
Provision (credit) for loan losses 25 78 141 15  
Loan Losses:          
Charge-offs (54) (20) (155) (68)  
Recoveries 13 13 44 39  
Net loan losses (41) (7) (111) (29)  
Total allowance for loan losses 692 668 692 668  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 82 57 72 58  
Provision (credit) for unfunded credit losses 8 10 18 9  
Reserve for unfunded credit commitments, end of year 90 67 90 67  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 782 735 782 735  
Total Investor Real Estate [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 151 91 121 79  
Cumulative change in accounting guidance         (3)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         118
Provision (credit) for loan losses 17 8 50 19  
Loan Losses:          
Charge-offs 0 0 0 0  
Recoveries 0 0 0 1  
Net loan losses 0 0 0 1  
Total allowance for loan losses 168 99 168 99  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 19 10 21 8  
Provision (credit) for unfunded credit losses 0 7 (2) 9  
Reserve for unfunded credit commitments, end of year 19 17 19 17  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 187 116 187 116  
Consumer Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 654 737 678 718  
Cumulative change in accounting guidance         (32)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         $ 646
Provision (credit) for loan losses 93 17 195 99  
Loan Losses:          
Charge-offs (70) (115) (186) (214)  
Recoveries 10 12 32 48  
Net loan losses (60) (103) (154) (166)  
Total allowance for loan losses 687 651 687 651  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 19 22 25 29  
Provision (credit) for unfunded credit losses 2 15 (4) 8  
Reserve for unfunded credit commitments, end of year 21 37 21 37  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest $ 708 $ 688 $ 708 $ 688