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DEBT - Maturities of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument    
2017 $ 36,125  
2018 46,089  
2019 22,013  
2020 10,175  
2021 19,131  
Thereafter 72,645  
Total 206,178 $ 201,275
Bank    
Debt Instrument    
2017 15,046  
2018 24,128  
2019 4,865  
2020 445  
2021 3,903  
Thereafter 1,067  
Total 49,454  
Broker-dealer    
Debt Instrument    
2017 2,637  
2018 1,388  
2019 283  
2020 1,103  
2021 168  
Thereafter 3,812  
Total 9,391  
Citigroup Inc.    
Debt Instrument    
2017 18,442  
2018 20,573  
2019 16,865  
2020 8,627  
2021 15,060  
Thereafter 67,766  
Total $ 147,333