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Loans and Related Allowance for Credit Losses (Rollforward of Allowance for Credit Losses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 4,741 $ 4,868 $ 5,361
Acquisition PCD reserves 1,056
Charge-offs (1,092) (985) (1,101)
Recoveries 382 422 444
Net (charge-offs) (710) (563) (657)
Provision for (recapture of) credit losses 792 439 (887)
Other 3 (3) (5)
Ending balance 4,791 4,741 4,868
Allowance For Unfunded Lending Related Commitments [Roll Forward]      
Beginning balance 694 662 584
Acquisition PCD reserves 46
Provision for (recapture of) credit losses (31) 32 32
Ending balance 663 694 662
Allowance for credit loss and off-balance sheet liability 5,454 5,435 5,530
Allowances for investment securities and other financial assets 120 176 171
Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance (35)
Ending balance   (35)
Cumulative Effect, Period of Adoption, Adjusted Balance      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance 4,706 4,868 5,361
Ending balance   4,706 4,868
Commercial      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance 3,114 3,185 3,337
Acquisition PCD reserves 774
Charge-offs (442) (307) (434)
Recoveries 137 114 106
Net (charge-offs) (305) (193) (328)
Provision for (recapture of) credit losses 447 126 (594)
Other 3 (4) (4)
Ending balance 3,259 3,114 3,185
Allowance For Unfunded Lending Related Commitments [Roll Forward]      
Beginning balance 613 564 485
Acquisition PCD reserves 43
Provision for (recapture of) credit losses (68) 49 36
Ending balance 545 613 564
Allowance for credit loss and off-balance sheet liability 3,804 3,727 3,749
Commercial | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance
Ending balance  
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance 3,114 3,185 3,337
Ending balance   3,114 3,185
Consumer      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance 1,627 1,683 2,024
Acquisition PCD reserves 282
Charge-offs (650) (678) (667)
Recoveries 245 308 338
Net (charge-offs) (405) (370) (329)
Provision for (recapture of) credit losses 345 313 (293)
Other 1 (1)
Ending balance 1,532 1,627 1,683
Allowance For Unfunded Lending Related Commitments [Roll Forward]      
Beginning balance 81 98 99
Acquisition PCD reserves 3
Provision for (recapture of) credit losses 37 (17) (4)
Ending balance 118 81 98
Allowance for credit loss and off-balance sheet liability 1,650 1,708 1,781
Consumer | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance (35)
Ending balance   (35)
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 1,592 1,683 2,024
Ending balance   $ 1,592 $ 1,683