Quarterly report pursuant to Section 13 or 15(d)

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

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Outstanding Loans and Leases and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses     $ 13,817 $ 14,693 $ 13,817 $ 14,693
Allowance for credit losses, period decrease         26  
Loan and leases receivable, allowance, period increase (decrease)         (85)  
Reserve for unfunded lending commitments, period increase         59  
Increase in provision for credit losses     1,500   5,600  
Provision for credit losses     898 (624) 1,451 (4,105)
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option         56,300  
Scenario, Forecast            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Unemployment rate, economic outlook 5.00% 5.00%        
U.S. gross domestic product, economic outlook 1.50% 0.20%        
Consumer real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses     462 653 462 653
Loan and leases receivable, allowance, period increase (decrease)         (191)  
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option         15,400  
Credit card and other consumer            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses     6,496 6,639 6,496 6,639
Loan and leases receivable, allowance, period increase (decrease)         20  
Commercial            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses     $ 6,859 $ 7,401 6,859 $ 7,401
Loan and leases receivable, allowance, period increase (decrease)         145  
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option         $ 40,900