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
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses     $ 13,483 $ 17,997
Allowance for credit losses, period increase (decrease)     (360)  
Loan and leases receivable, allowance, period increase (decrease)     (283)  
Reserve for unfunded lending commitments, period increase (decrease)     (77)  
Provision for credit losses     30 (1,860)
Increase in provision for credit losses     1,900  
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option     14,700  
Scenario, Forecast        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Unemployment rate, economic outlook 4.50% 5.00%    
U.S. gross domestic product, economic outlook 1.40% 1.40%    
Consumer real estate        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses     564 813
Loan and leases receivable, allowance, period increase (decrease)     (89)  
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option     3,200  
Credit card and other consumer        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses     6,242 7,946
Loan and leases receivable, allowance, period increase (decrease)     (234)  
Commercial        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses     6,677 $ 9,238
Loan and leases receivable, allowance, period increase (decrease)     (37)  
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option     $ 12,700