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Unsecured Borrowings - Unsecured Long-Term Borrowings (Detail) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Fixed-rate obligations $ 155,582 $ 172,942
Floating-rate obligations 84,383 81,150
Total $ 239,965 254,092
Unsecured long term borrowings, maturities, end of range 2065  
Unsecured Debt    
Debt Instrument [Line Items]    
Total $ 239,965  
U.S. Dollar    
Debt Instrument [Line Items]    
Fixed-rate obligations 119,962 126,534
Floating-rate obligations 55,812 50,995
Total $ 175,774 $ 177,529
U.S. Dollar | Minimum | Unsecured Debt    
Debt Instrument [Line Items]    
Interest rate 0.63% 0.48%
U.S. Dollar | Maximum | Unsecured Debt    
Debt Instrument [Line Items]    
Interest rate 6.75% 7.68%
U.S. Dollar | Weighted Average | Unsecured Debt    
Debt Instrument [Line Items]    
Interest rate 3.39% 3.34%
Non-U.S. Dollar    
Debt Instrument [Line Items]    
Fixed-rate obligations $ 35,620 $ 46,408
Floating-rate obligations 28,571 30,155
Total $ 64,191 $ 76,563
Non-U.S. Dollar | Minimum | Unsecured Debt    
Debt Instrument [Line Items]    
Interest rate 0.13% 0.13%
Non-U.S. Dollar | Maximum | Unsecured Debt    
Debt Instrument [Line Items]    
Interest rate 13.00% 13.00%
Non-U.S. Dollar | Weighted Average | Unsecured Debt    
Debt Instrument [Line Items]    
Interest rate 1.84% 1.86%