Annual report [Section 13 and 15(d), not S-K Item 405]

Outstanding Loans and Leases and Allowance for Credit Losses - Allowance by Portfolio Segment (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Allowance by Portfolio Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance $ 13,342 $ 12,682 $ 12,387
Loans and leases charged off (7,054) (4,817) (3,439)
Recoveries of loans and leases previously charged off 1,023 1,018 1,267
Net charge-offs (6,031) (3,799) (2,172)
Provision for loan and lease losses 5,935 4,725 2,460
Other (6) (23) 7
Allowance for loan and lease losses, ending balance 13,240 13,342 12,682
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 1,209 1,540 1,456
Provision for unfunded lending commitments (114) (331) 83
Other 1   1
Reserve for unfunded lending commitments, ending balance 1,096 1,209 1,540
Allowance for credit losses 14,336 14,551 14,222
Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance   (243)  
Allowance for loan and lease losses, ending balance     (243)
Cumulative Effect, Period of Adoption, Adjusted Balance      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance   12,439  
Allowance for loan and lease losses, ending balance     12,439
Consumer real estate      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance 386 420 557
Loans and leases charged off (42) (103) (206)
Recoveries of loans and leases previously charged off 83 146 224
Net charge-offs 41 43 18
Provision for loan and lease losses (135) (19) (164)
Other 1 9 9
Allowance for loan and lease losses, ending balance 293 386 420
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 82 94 96
Provision for unfunded lending commitments (26) (12) (3)
Other 1   1
Reserve for unfunded lending commitments, ending balance 57 82 94
Allowance for credit losses 350 468 514
Consumer real estate | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance   (67)  
Allowance for loan and lease losses, ending balance     (67)
Consumer real estate | Cumulative Effect, Period of Adoption, Adjusted Balance      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance   353  
Allowance for loan and lease losses, ending balance     353
Credit card and other consumer      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance 8,134 6,817 6,476
Loans and leases charged off (5,077) (3,870) (2,755)
Recoveries of loans and leases previously charged off 798 737 882
Net charge-offs (4,279) (3,133) (1,873)
Provision for loan and lease losses 4,421 4,558 2,215
Other 1 1 (1)
Allowance for loan and lease losses, ending balance 8,277 8,134 6,817
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 0 0 0
Provision for unfunded lending commitments 0 0 0
Other 0   0
Reserve for unfunded lending commitments, ending balance 0 0 0
Allowance for credit losses 8,277 8,134 6,817
Credit card and other consumer | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance   (109)  
Allowance for loan and lease losses, ending balance     (109)
Credit card and other consumer | Cumulative Effect, Period of Adoption, Adjusted Balance      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance   6,708  
Allowance for loan and lease losses, ending balance     6,708
Commercial      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance 4,822 5,445 5,354
Loans and leases charged off (1,935) (844) (478)
Recoveries of loans and leases previously charged off 142 135 161
Net charge-offs (1,793) (709) (317)
Provision for loan and lease losses 1,649 186 409
Other (8) (33) (1)
Allowance for loan and lease losses, ending balance 4,670 4,822 5,445
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 1,127 1,446 1,360
Provision for unfunded lending commitments (88) (319) 86
Other 0   0
Reserve for unfunded lending commitments, ending balance 1,039 1,127 1,446
Allowance for credit losses $ 5,709 5,949 6,891
Commercial | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance   (67)  
Allowance for loan and lease losses, ending balance     (67)
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance   $ 5,378  
Allowance for loan and lease losses, ending balance     $ 5,378