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BORROWED FUNDS - Maturities of Long-term Borrowed Funds (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
2017 or on demand $ 4,251  
2018 2,807  
2019 1,511  
2020 2  
2021 1,350  
2022 and thereafter 1,981  
Total 11,902 $ 9,886
Citizens Financial Group, Inc.    
Debt Instrument [Line Items]    
2017 or on demand 0  
2018 0  
2019 0  
2020 0  
2021 348  
2022 and thereafter 1,970  
Total 2,318  
Banking Subsidiaries    
Debt Instrument [Line Items]    
2017 or on demand 4,251  
2018 2,807  
2019 1,511  
2020 2  
2021 1,002  
2022 and thereafter 11  
Total $ 9,584