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BORROWED FUNDS - Maturities of Long-term Borrowed Funds (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
2019 $ 6,244  
2020 2,473  
2021 1,305  
2022 1,084  
2023 1,083  
2024 and thereafter 1,297  
Total 13,486 $ 11,765
Banking Subsidiaries    
Debt Instrument [Line Items]    
2019 6,244  
2020 2,473  
2021 956  
2022 736  
2023 750  
2024 and thereafter 7  
Total 11,166  
Parent Company    
Debt Instrument [Line Items]    
2019 0  
2020 0  
2021 349  
2022 348  
2023 333  
2024 and thereafter 1,290  
Total $ 2,320