v3.22.0.1
Loans - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2023
Loans Receivable [Line Items]        
Gains/(Losses) as a result of changes in the fair value $ (3,544) $ (3,161) $ (9,499)  
Impaired loans receivable (excluding PCI loans) on non-accrual status 2,469 3,552    
Amount Of Lending Commitments Held For Investment $ 197,120 $ 162,513    
Percentage of loans that were rated pass/non-criticized 92.00% 85.00%    
Change in allowance for credit losses $ (82) $ 2,630    
Concentration Risk,Percentage 100.00% 100.00%    
Impact of CECL adoption   $ 727    
Impact of CECL adoption   (48)    
Changes in allowance for credit loss   1,950    
Impact of CECL adoption   679    
Provision for credit losses $ 357 $ 3,098 $ 1,065  
Nonaccrual loans allowance for loans losses divided by total 144.70% 109.10%    
First Quarter of 2023 | COUNTRY U S [Member]        
Loans Receivable [Line Items]        
Maximum estimated unemployment rate       9.50%
Maximum decline in gross domestic rate relative to expected rate       2.50%
COVID 19 [Member]        
Loans Receivable [Line Items]        
CARES Act/Interagency TDR relief $ 166 $ 184    
Impact of CECL adoption   (169)    
Financial Asset, Equal to or Greater than 30 Days Past Due [Member]        
Loans Receivable [Line Items]        
Impaired loans receivable (excluding PCI loans) on non-accrual status 254 533    
Wholesale [Member]        
Loans Receivable [Line Items]        
Nonaccrual loans, for which allowance for credit losses was measured 2,430 3,510    
Nonaccrual loans, allowance for credit losses 543 649    
Nonaccrual loans, for which no allowance for credit losses required 140 584    
Impact of CECL adoption   452    
Consumer [Member]        
Loans Receivable [Line Items]        
Impact of CECL adoption   444    
Credit cards [Member]        
Loans Receivable [Line Items]        
Provision for credit losses 185      
Other Principal Transactions [Member]        
Loans Receivable [Line Items]        
Gains/(Losses) as a result of changes in the fair value $ 216 $ 151    
Credit card [Member]        
Loans Receivable [Line Items]        
Concentration Risk,Percentage 100.00% 100.00%    
Commitment to acquire loan portfolio $ 2,000      
Credit card [Member] | Consumer [Member]        
Loans Receivable [Line Items]        
Amount Of Lending Commitments Held For Investment 35,932 $ 21,640    
Corporate And Commercial Real Estate Loans [Member]        
Loans Receivable [Line Items]        
Loans modified in troubled debt restructuring $ 267 $ 315    
Diversified Industrials [Member]        
Loans Receivable [Line Items]        
Concentration Risk,Percentage 13.00% 17.00%    
Technology Media Telecommunications [Member]        
Loans Receivable [Line Items]        
Concentration Risk,Percentage 18.00% 17.00%    
Funds [Member]        
Loans Receivable [Line Items]        
Concentration Risk,Percentage 21.00% 13.00%    
Natural Resources Utilities [Member]        
Loans Receivable [Line Items]        
Concentration Risk,Percentage 9.00% 12.00%    
Financial Institutions [Member]        
Loans Receivable [Line Items]        
Concentration Risk,Percentage 8.00% 10.00%    
Credit Card Receivables Issued To Customers [Member]        
Loans Receivable [Line Items]        
Amount Of Lending Commitments Held For Investment $ 33,970 $ 21,640    
Level 3 [Member]        
Loans Receivable [Line Items]        
Net gains / (losses) on assets 66 159    
Level 3 [Member] | Interest Income [Member]        
Loans Receivable [Line Items]        
Net gains / (losses) on assets 24 24    
Level 3 [Member] | Loans Non Trading [Member]        
Loans Receivable [Line Items]        
Net unrealized gains / (losses) on assets (33) 87    
Net realized gains / (losses) on assets 99 72    
Level 3 [Member] | Other Principal Transactions [Member]        
Loans Receivable [Line Items]        
Net gains / (losses) on assets $ 42 $ 135