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DEBT - Maturities of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument    
2018 $ 53,478  
2019 36,289  
2020 23,188  
2021 21,019  
2022 12,364  
Thereafter 90,371  
Total 236,709 $ 206,178
Citigroup Inc.    
Debt Instrument    
2018 20,050  
2019 16,656  
2020 9,565  
2021 15,499  
2022 9,627  
Thereafter 80,766  
Total 152,163  
Bank    
Debt Instrument    
2018 29,270  
2019 17,245  
2020 10,302  
2021 4,077  
2022 1,471  
Thereafter 3,491  
Total 65,856  
Broker-dealer    
Debt Instrument    
2018 4,158  
2019 2,388  
2020 3,321  
2021 1,443  
2022 1,266  
Thereafter 6,114  
Total $ 18,690