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BORROWED FUNDS - Maturities of Long-term Borrowed Funds (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
2017 or on demand $ 5,256  
2018 759  
2019 1,514  
2020 2  
2021 5  
2022 and thereafter 2,499  
Total 10,035 $ 9,886
Citizens Financial Group, Inc.    
Debt Instrument [Line Items]    
2017 or on demand 0  
2018 0  
2019 0  
2020 0  
2021 0  
2022 and thereafter 2,487  
Total 2,487  
Banking Subsidiaries    
Debt Instrument [Line Items]    
2017 or on demand 5,256  
2018 759  
2019 1,514  
2020 2  
2021 5  
2022 and thereafter 12  
Total $ 7,548