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BORROWED FUNDS - Maturities of Long-term Borrowed Funds (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
2019 $ 3,244  
2020 7,972  
2021 1,303  
2022 1,080  
2023 741  
2024 and thereafter 1,299  
Total 15,639 $ 11,765
Parent Company    
Debt Instrument [Line Items]    
2019 0  
2020 0  
2021 349  
2022 348  
2023 0  
2024 and thereafter 1,290  
Total 1,987  
Banking Subsidiaries    
Debt Instrument [Line Items]    
2019 3,244  
2020 7,972  
2021 954  
2022 732  
2023 741  
2024 and thereafter 9  
Total $ 13,652