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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2022
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period $ 1,617 $ 1,472 $ 1,576 $ 1,464  
Cumulative change in accounting guidance         $ (38)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         1,426
Provision (credit) for loan losses 105 122 267 251  
Loan Losses:          
Charge-offs (123) (112) (264) (217)  
Recoveries 22 31 42 53  
Net loan losses (101) (81) (222) (164)  
Total allowance for loan losses 1,621 1,513 1,621 1,513  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 114 124 124 118  
Provision (credit) for unfunded credit losses (3) (4) (13) 2  
Reserve for unfunded credit commitments, end of year 111 120 111 120  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 1,732 1,633 1,732 1,633  
Commercial Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 756 693 722 (665)  
Cumulative change in accounting guidance         (3)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         662
Provision (credit) for loan losses 31 46 119 116  
Loan Losses:          
Charge-offs (61) (52) (123) (101)  
Recoveries 10 21 18 31  
Net loan losses (51) (31) (105) (70)  
Total allowance for loan losses 736 708 736 708  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 87 77 92 72  
Provision (credit) for unfunded credit losses (2) 5 (7) 10  
Reserve for unfunded credit commitments, end of year 85 82 85 82  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 821 790 821 790  
Total Investor Real Estate [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 211 126 192 (121)  
Cumulative change in accounting guidance         (3)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         118
Provision (credit) for loan losses 21 25 44 33  
Loan Losses:          
Charge-offs 0 0 (5) 0  
Recoveries 1 0 2 0  
Net loan losses 1 0 (3) 0  
Total allowance for loan losses 233 151 233 151  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 10 27 13 21  
Provision (credit) for unfunded credit losses (2) (8) (5) (2)  
Reserve for unfunded credit commitments, end of year 8 19 8 19  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 241 170 241 170  
Consumer Portfolio Segment [Member]          
Allowance for Loan and Lease Losses [Roll Forward]          
Allowance for loan losses, beginning of period 650 653 662 (678)  
Cumulative change in accounting guidance         (32)
LoanandLeaseReceivableAllowanceBeginningBalanceadjustedforchangeinaccountingguidance         $ 646
Provision (credit) for loan losses 53 51 104 102  
Loan Losses:          
Charge-offs (62) (60) (136) (116)  
Recoveries 11 10 22 22  
Net loan losses (51) (50) (114) (94)  
Total allowance for loan losses 652 654 652 654  
Reserve For Unfunded Credit Commitments [Roll Forward]          
Reserve for unfunded credit commitments, beginning of year 17 20 19 25  
Provision (credit) for unfunded credit losses 1 (1) (1) (6)  
Reserve for unfunded credit commitments, end of year 18 19 18 19  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest $ 670 $ 673 $ 670 $ 673