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BORROWED FUNDS - Maturities of Long-term Borrowed Funds (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
2018 $ 4,097  
2019 3,491  
2020 1,760  
2021 1,324  
2022 1,098  
2023 and thereafter 1,630  
Total 13,400 $ 12,790
Banking Subsidiaries    
Debt Instrument [Line Items]    
2018 4,097  
2019 3,491  
2020 1,760  
2021 976  
2022 750  
2023 and thereafter 7  
Total 11,081  
Parent Company    
Debt Instrument [Line Items]    
2018 0  
2019 0  
2020 0  
2021 348  
2022 348  
2023 and thereafter 1,623  
Total $ 2,319