Quarterly report pursuant to Section 13 or 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
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance $ 13,342 $ 12,682 $ 12,682
Loans and leases charged off (1,738) (1,056)  
Recoveries of loans and leases previously charged off 240 249  
Net charge-offs (1,498) (807)  
Provision for loan and lease losses 1,370 900  
Other (1) (18)  
Allowance for loan and lease losses, ending balance 13,213 12,514 13,342
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 1,209 1,540 1,540
Provision for unfunded lending commitments (51) (103)  
Reserve for unfunded lending commitments, ending balance 1,158 1,437 1,209
Allowance for credit losses 14,371 13,951  
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) (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 12,439
Consumer real estate      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for loan and lease losses, beginning balance 386 420 420
Loans and leases charged off (11) (14)  
Recoveries of loans and leases previously charged off 21 25  
Net charge-offs 10 11  
Provision for loan and lease losses (42) 34  
Other 1 5  
Allowance for loan and lease losses, ending balance 355 403 386
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 82 94 94
Provision for unfunded lending commitments (25) (1)  
Reserve for unfunded lending commitments, ending balance 57 93 82
Allowance for credit losses 412 496  
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) (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   353 353
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 6,817
Loans and leases charged off (1,225) (861)  
Recoveries of loans and leases previously charged off 187 197  
Net charge-offs (1,038) (664)  
Provision for loan and lease losses 1,026 913  
Other (1) 1  
Allowance for loan and lease losses, ending balance 8,121 6,958 8,134
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  
Reserve for unfunded lending commitments, ending balance 0 0 0
Allowance for credit losses 8,121 6,958  
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) (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 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 5,445
Loans and leases charged off (502) (181)  
Recoveries of loans and leases previously charged off 32 27  
Net charge-offs (470) (154)  
Provision for loan and lease losses 386 (47)  
Other (1) (24)  
Allowance for loan and lease losses, ending balance 4,737 5,153 4,822
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Reserve for unfunded lending commitments, beginning balance 1,127 1,446 1,446
Provision for unfunded lending commitments (26) (102)  
Reserve for unfunded lending commitments, ending balance 1,101 1,344 1,127
Allowance for credit losses $ 5,838 6,497  
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) (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 $ 5,378