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Loans and Related Allowance for Credit Losses (Rollforward of Allowance for Credit Losses of Loans and Leases) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance $ 4,636 $ 4,737 $ 4,791 $ 4,741 $ 4,741
Charge-offs (376) (233) (1,081) (808)  
Recoveries 90 112 290 298  
Net (charge-offs) (286) (121) (791) (510)  
Provision for credit losses 235 153 586 571  
Other 4 (2) 3  
Ending balance 4,589 4,767 4,589 4,767 4,791
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 717 663 663 694 694
Provision for (recapture of) credit losses 7 (23) 61 (54)  
Other 1 1  
Ending balance 725 640 725 640 663
Allowance for credit loss 5,314 5,407 5,314 5,407 5,500
Allowances for investment securities and other financial assets 111 131 111 131  
Cumulative Effect, Period of Adoption, Adjustment          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance       (35) (35)
Cumulative Effect, Period of Adoption, Adjusted Balance          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 4,636 4,737 4,791 4,706 4,706
Ending balance         4,791
Total commercial          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 3,243 3,142 3,259 3,114 3,114
Charge-offs (200) (72) (546) (327) (442)
Recoveries 28 49 103 110  
Net (charge-offs) (172) (23) (443) (217)  
Provision for credit losses 151 105 408 325  
Other 4 (2) 2  
Ending balance 3,226 3,222 3,226 3,222 3,259
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 581 555 545 613 613
Provision for (recapture of) credit losses (2) (22) 34 (80)  
Other 1 1  
Ending balance 580 533 580 533 545
Allowance for credit loss 3,806 3,755 3,806 3,755  
Total commercial | Cumulative Effect, Period of Adoption, Adjusted Balance          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 3,243 3,142 3,259 3,114 3,114
Ending balance         3,259
Total consumer          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 1,393 1,595 1,532 1,627 1,627
Charge-offs (176) (161) (535) (481)  
Recoveries 62 63 187 188  
Net (charge-offs) (114) (98) (348) (293)  
Provision for credit losses 84 48 178 246  
Other   1  
Ending balance 1,363 1,545 1,363 1,545 1,532
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 136 108 118 81 81
Provision for (recapture of) credit losses 9 (1) 27 26  
Other    
Ending balance 145 107 145 107 118
Allowance for credit loss 1,508 1,652 1,508 1,652  
Total consumer | Cumulative Effect, Period of Adoption, Adjusted Balance          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance $ 1,393 $ 1,595 $ 1,532 $ 1,592 1,592
Ending balance         $ 1,532