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BORROWED FUNDS - Maturities of Long-term Borrowed Funds (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
2018 or on demand $ 5,847  
2019 1,491  
2020 1,762  
2021 1,325  
2022 1,099  
2023 and thereafter 1,630  
Total 13,154 $ 12,790
Citizens Financial Group, Inc.    
Debt Instrument [Line Items]    
2018 or on demand 0  
2019 0  
2020 0  
2021 348  
2022 347  
2023 and thereafter 1,623  
Total 2,318  
Banking Subsidiaries    
Debt Instrument [Line Items]    
2018 or on demand 5,847  
2019 1,491  
2020 1,762  
2021 977  
2022 752  
2023 and thereafter 7  
Total $ 10,836