v3.22.0.1
Unsecured Borrowings - Unsecured Long-Term Borrowings (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total $ 254,092 $ 213,481
Group Inc. [Member]    
Debt Instrument [Line Items]    
Fixed-rate obligations 167,950 134,472
Floating-rate obligations 40,846 37,450
Total 208,796 171,922
Subsidiaries [Member]    
Debt Instrument [Line Items]    
Fixed-rate obligations 4,992 4,845
Floating-rate obligations 40,304 36,714
Total 45,296 41,559
U.S. Dollar [Member]    
Debt Instrument [Line Items]    
Total 177,529 142,577
U.S. Dollar [Member] | Group Inc. [Member]    
Debt Instrument [Line Items]    
Fixed-rate obligations 124,731 98,858
Floating-rate obligations 23,452 18,579
U.S. Dollar [Member] | Subsidiaries [Member]    
Debt Instrument [Line Items]    
Fixed-rate obligations 1,803 1,700
Floating-rate obligations 27,543 23,440
Non-U.S. Dollar [Member]    
Debt Instrument [Line Items]    
Total 76,563 70,904
Non-U.S. Dollar [Member] | Group Inc. [Member]    
Debt Instrument [Line Items]    
Fixed-rate obligations 43,219 35,614
Floating-rate obligations 17,394 18,871
Non-U.S. Dollar [Member] | Subsidiaries [Member]    
Debt Instrument [Line Items]    
Fixed-rate obligations 3,189 3,145
Floating-rate obligations $ 12,761 $ 13,274