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BORROWED FUNDS - Maturities of Long-term Borrowed Funds (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2019 $ 748  
2020 4,989  
2021 1,327  
2022 2,097  
2023 759  
2024 and thereafter 1,805  
Total 11,725 $ 15,925
Parent Company    
Debt Instrument [Line Items]    
2019 0  
2020 0  
2021 349  
2022 348  
2023 0  
2024 and thereafter 1,291  
Total 1,988  
Banking and Other Subsidiaries    
Debt Instrument [Line Items]    
2019 748  
2020 4,989  
2021 978  
2022 1,749  
2023 759  
2024 and thereafter 514  
Total $ 9,737