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DEBT - Maturities of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument    
2020 $ 37,257  
2021 38,083  
2022 27,090  
2023 20,128  
2024 16,023  
Thereafter 110,179  
Total 248,760 $ 231,999
Citigroup Inc.    
Debt Instrument    
2020 7,033  
2021 15,208  
2022 13,061  
2023 14,202  
2024 8,247  
Thereafter 92,726  
Total 150,477  
Bank    
Debt Instrument    
2020 20,654  
2021 14,023  
2022 8,471  
2023 2,634  
2024 4,417  
Thereafter 3,141  
Total 53,340  
Broker-dealer    
Debt Instrument    
2020 9,570  
2021 8,852  
2022 5,558  
2023 3,292  
2024 3,359  
Thereafter 14,312  
Total $ 44,943