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DEBT - Maturities of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument    
2016 $ 43,537  
2017 34,345  
2018 31,416  
2019 19,153  
2020 9,377  
Thereafter 63,447  
Long-term debt 201,275 $ 223,080
Bank    
Debt Instrument    
2016 24,577  
2017 14,614  
2018 9,341  
2019 2,280  
2020 448  
Thereafter 3,871  
Long-term debt 55,131  
Broker-dealer    
Debt Instrument    
2016 951  
2017 294  
2018 806  
2019 640  
2020 103  
Thereafter 1,193  
Long-term debt 3,987  
Citigroup Inc.    
Debt Instrument    
2016 18,009  
2017 19,437  
2018 21,269  
2019 16,233  
2020 8,826  
Thereafter 58,383  
Long-term debt $ 142,157