v3.22.0.1
Regulation and Capital Adequacy - Risk-weighted Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Standardized [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Credit RWAs $ 600,354 $ 485,438  
Market RWAs 76,509 68,724  
Total Operational RWAs 0 0  
Total RWAs 676,863 554,162 $ 563,575
Standardized [Member] | Derivatives [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Credit RWAs 175,628 120,292  
Standardized [Member] | Commitments Guarantees and Loans [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Credit RWAs 233,639 176,501  
Standardized [Member] | Securities Financing Transactions [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Credit RWAs 76,346 71,427  
Standardized [Member] | Equity Investments [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Credit RWAs 43,256 46,944  
Standardized [Member] | Other [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Credit RWAs 71,485 70,274  
Standardized [Member] | Regulatory VaR [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Market RWAs 13,510 14,913  
Standardized [Member] | Stressed VaR [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Market RWAs 38,922 31,978  
Standardized [Member] | Incremental Risk [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Market RWAs 6,867 7,882  
Standardized [Member] | Comprehensive Risk [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Market RWAs 2,521 1,758  
Standardized [Member] | Specific Risk [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Market RWAs 14,689 12,193  
Advanced [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Credit RWAs 438,499 412,713  
Market RWAs 76,509 68,724  
Total Operational RWAs 132,913 128,313  
Total RWAs 647,921 609,750 $ 544,653
Advanced [Member] | Derivatives [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Credit RWAs 109,532 111,691  
Advanced [Member] | Commitments Guarantees and Loans [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Credit RWAs 182,210 151,587  
Advanced [Member] | Securities Financing Transactions [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Credit RWAs 14,407 16,568  
Advanced [Member] | Equity Investments [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Credit RWAs 45,582 49,268  
Advanced [Member] | Other [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Credit RWAs 86,768 83,599  
Advanced [Member] | Regulatory VaR [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Market RWAs 13,510 14,913  
Advanced [Member] | Stressed VaR [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Market RWAs 38,922 31,978  
Advanced [Member] | Incremental Risk [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Market RWAs 6,867 7,882  
Advanced [Member] | Comprehensive Risk [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Market RWAs 2,521 1,758  
Advanced [Member] | Specific Risk [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Market RWAs $ 14,689 $ 12,193