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 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]              
Allowance for credit losses       $ 15,782     $ 21,091
Allowance for credit losses, period increase (decrease)       (4,900)      
Loan and leases receivable, allowance, period increase (decrease)       (4,700)      
Reserve for unfunded lending commitments, period increase (decrease)       (191)      
Outstanding loans and Leases, period increase (decrease), excluding loans accounted for under the fair value option       (9,200)      
Scenario, Forecast              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Unemployment rate, economic outlook         5.00% 6.00%  
U.S. gross domestic product, economic outlook 2.10% 1.90% 4.50%        
Consumer real estate              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Allowance for credit losses       704     974
Loan and leases receivable, allowance, period increase (decrease)       (291)      
Outstanding loans and Leases, period increase (decrease), excluding loans accounted for under the fair value option       (10,600)      
Credit card and other consumer              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Allowance for credit losses       6,835     10,122
Loan and leases receivable, allowance, period increase (decrease)       (2,400)      
Commercial              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Allowance for credit losses       8,243     $ 9,995
Loan and leases receivable, allowance, period increase (decrease)       (2,200)      
Commercial, excluding small business              
Financing Receivable, Allowance for Credit Loss [Line Items]              
Outstanding loans and Leases, period increase (decrease), excluding loans accounted for under the fair value option       $ 8,000