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BORROWED FUNDS - Maturities of Long-term Borrowed Funds (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
2021 $ 1,361  
2022 1,968  
2023 778  
2024 184  
2025 1,402  
2026 and thereafter 2,653  
Total 8,346 $ 14,047
Parent Company    
Debt Instrument [Line Items]    
2021 350  
2022 182  
2023 0  
2024 184  
2025 643  
2026 and thereafter 2,082  
Total 3,441  
Banking Subsidiaries    
Debt Instrument [Line Items]    
2021 1,011  
2022 1,786  
2023 778  
2024 0  
2025 759  
2026 and thereafter 571  
Total $ 4,905