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DEBT - Maturities of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument    
2019 $ 38,590  
2020 37,303  
2021 28,542  
2022 14,095  
2023 19,061  
Thereafter 94,408  
Total 231,999 $ 236,709
Citigroup Inc.    
Debt Instrument    
2019 14,144  
2020 9,266  
2021 14,758  
2022 9,944  
2023 14,361  
Thereafter 81,295  
Total 143,768  
Bank    
Debt Instrument    
2019 18,809  
2020 21,620  
2021 10,877  
2022 2,595  
2023 2,572  
Thereafter 4,764  
Total 61,237  
Broker-dealer    
Debt Instrument    
2019 5,637  
2020 6,417  
2021 2,907  
2022 1,556  
2023 2,128  
Thereafter 8,349  
Total $ 26,994