v3.20.4
Unsecured Borrowings - Unsecured Long-Term Borrowings by Maturity Date (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total $ 213,481 $ 207,076
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
2022 28,969  
2023 33,293  
2024 20,331  
2025 27,176  
2026 - thereafter 103,712  
Total 213,481  
Group Inc. [Member]    
Debt Instrument [Line Items]    
Total 171,922 168,588
Group Inc. [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
2022 22,637  
2023 26,961  
2024 15,551  
2025 21,405  
2026 - thereafter 85,368  
Total 171,922  
Subsidiaries [Member]    
Debt Instrument [Line Items]    
Total 41,559 $ 38,488
Subsidiaries [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
2022 6,332  
2023 6,332  
2024 4,780  
2025 5,771  
2026 - thereafter 18,344  
Total $ 41,559