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 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses     $ 13,434 $ 15,782 $ 13,434 $ 15,782
Allowance for credit losses, period decrease         409  
Loan and leases receivable, allowance, period increase (decrease)         (414)  
Reserve for unfunded lending commitments, period increase         5  
Increase in provision for credit losses     2,100   4,000  
Provision for credit losses     523 (1,621) 553 (3,481)
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option         54,000  
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 0.80% 0.60%        
Consumer real estate            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses     475 704 475 704
Loan and leases receivable, allowance, period increase (decrease)         (178)  
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option         13,000  
Credit card and other consumer            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses     6,216 6,835 6,216 6,835
Loan and leases receivable, allowance, period increase (decrease)         (260)  
Commercial            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit losses     $ 6,743 $ 8,243 6,743 $ 8,243
Loan and leases receivable, allowance, period increase (decrease)         29  
Outstanding loans and leases, period increase (decrease), excluding loans accounted for under the fair value option         $ 40,900