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Loans And The 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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2022
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period $ 1,621 $ 1,513 $ 1,576 $ 1,464  
Cumulative change in accounting guidance         $ (38)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         1,426
Provision (credit) for loan losses 103 135 370 386  
Loan Losses:          
Charge-offs (143) (124) (407) (341)  
Recoveries 26 23 68 76  
Net loan losses (117) (101) (339) (265)  
Total allowance for loan losses 1,607 1,547 1,607 1,547  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 111 120 124 118  
Provision (credit) for unfunded credit losses 10 10 (3) 12  
Reserve for unfunded credit commitments, end of year 121 130 121 130  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 1,728 1,677 1,728 1,677  
Commercial Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 736 708 722 665  
Cumulative change in accounting guidance         (3)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         662
Provision (credit) for loan losses 47 25 166 141  
Loan Losses:          
Charge-offs (71) (54) (194) (155)  
Recoveries 15 13 33 44  
Net loan losses (56) (41) (161) (111)  
Total allowance for loan losses 727 692 727 692  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 85 82 92 72  
Provision (credit) for unfunded credit losses 8 8 1 18  
Reserve for unfunded credit commitments, end of year 93 90 93 90  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 820 782 820 782  
Total Investor Real Estate [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 233 151 192 121  
Cumulative change in accounting guidance         (3)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         118
Provision (credit) for loan losses 10 17 54 50  
Loan Losses:          
Charge-offs (12) 0 (17) 0  
Recoveries 0 0 2 0  
Net loan losses (12) 0 (15) 0  
Total allowance for loan losses 231 168 231 168  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 8 19 13 21  
Provision (credit) for unfunded credit losses 2 0 (3) (2)  
Reserve for unfunded credit commitments, end of year 10 19 10 19  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 241 187 241 187  
Consumer Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 652 654 662 678  
Cumulative change in accounting guidance         (32)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         $ 646
Provision (credit) for loan losses 46 93 150 195  
Loan Losses:          
Charge-offs (60) (70) (196) (186)  
Recoveries 11 10 33 32  
Net loan losses (49) (60) (163) (154)  
Total allowance for loan losses 649 687 649 687  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 18 19 19 25  
Provision (credit) for unfunded credit losses 0 2 (1) (4)  
Reserve for unfunded credit commitments, end of year 18 21 18 21  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest $ 667 $ 708 $ 667 $ 708