v3.21.2
Unsecured Borrowings - Unsecured Long-Term Borrowings by Maturity Date (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total $ 242,780 $ 213,481
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
2022 7,767  
2023 38,318  
2024 30,240  
2025 28,006  
2026 22,605  
2027 - thereafter 115,844  
Total $ 242,780