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BORROWED FUNDS - Maturities of Long-term Borrowed Funds (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2020 $ 2,504  
2021 6,347  
2022 2,115  
2023 765  
2024 293  
2025 and thereafter 2,023  
Total 14,047 $ 15,925
Parent Company    
Debt Instrument [Line Items]    
2020 0  
2021 349  
2022 348  
2023 0  
2024 292  
2025 and thereafter 1,495  
Total 2,484  
Banking Subsidiaries    
Debt Instrument [Line Items]    
2020 2,504  
2021 5,998  
2022 1,767  
2023 765  
2024 1  
2025 and thereafter 528  
Total $ 11,563