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BORROWED FUNDS - Maturities of Long-term Borrowed Funds (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
2019 $ 0  
2020 9,982  
2021 1,316  
2022 1,087  
2023 751  
2024 and thereafter 1,297  
Total 14,433 $ 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 0  
2020 9,982  
2021 967  
2022 739  
2023 751  
2024 and thereafter 7  
Total $ 12,446