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Unsecured Borrowings - Unsecured Long-Term Borrowings by Maturity Date (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total $ 213,936 $ 207,076
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
2021 9,062  
2022 26,512  
2023 29,746  
2024 19,727  
2025 26,433  
2026 - thereafter 102,456  
Total $ 213,936