Annual report pursuant to Section 13 and 15(d)

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, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance $ 12,682 $ 12,387 $ 18,802
Loans and leases charged off (4,817) (3,439) (3,797)
Recoveries of loans and leases previously charged off 1,018 1,267 1,554
Net charge-offs (3,799) (2,172) (2,243)
Provision for loan and lease losses 4,725 2,460 (4,173)
Other (23) 7 1
Allowance for loan and lease losses, ending balance 13,342 12,682 12,387
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 1,540 1,456 1,878
Provision for unfunded lending commitments (331) 83 (421)
Other   1 (1)
Reserve for unfunded lending commitments, ending balance 1,209 1,540 1,456
Allowance for credit losses 14,551 14,222 13,843
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 420 557 858
Loans and leases charged off (103) (206) (78)
Recoveries of loans and leases previously charged off 146 224 225
Net charge-offs 43 18 147
Provision for loan and lease losses (19) (164) (449)
Other 9 9 1
Allowance for loan and lease losses, ending balance 386 420 557
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 94 96 137
Provision for unfunded lending commitments (12) (3) (41)
Other   1 0
Reserve for unfunded lending commitments, ending balance 82 94 96
Allowance for credit losses 468 514 653
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 6,817 6,476 9,213
Loans and leases charged off (3,870) (2,755) (3,000)
Recoveries of loans and leases previously charged off 737 882 1,006
Net charge-offs (3,133) (1,873) (1,994)
Provision for loan and lease losses 4,558 2,215 (744)
Other 1 (1) 1
Allowance for loan and lease losses, ending balance 8,134 6,817 6,476
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 8,134 6,817 6,476
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 5,445 5,354 8,731
Loans and leases charged off (844) (478) (719)
Recoveries of loans and leases previously charged off 135 161 323
Net charge-offs (709) (317) (396)
Provision for loan and lease losses 186 409 (2,980)
Other (33) (1) (1)
Allowance for loan and lease losses, ending balance 4,822 5,445 5,354
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 1,446 1,360 1,741
Provision for unfunded lending commitments (319) 86 (380)
Other   0 (1)
Reserve for unfunded lending commitments, ending balance 1,127 1,446 1,360
Allowance for credit losses 5,949 6,891 $ 6,714
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