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DEBT - Maturities of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument    
2021 $ 43,321  
2022 36,745  
2023 26,047  
2024 21,006  
2025 18,877  
Thereafter 125,690  
Total 271,686 $ 248,760
Citigroup Inc.    
Debt Instrument    
2021 15,605  
2022 13,159  
2023 14,805  
2024 12,329  
2025 13,733  
Thereafter 100,933  
Total 170,564  
Bank    
Debt Instrument    
2021 18,577  
2022 14,608  
2023 2,685  
2024 4,588  
2025 501  
Thereafter 3,782  
Total 44,741  
Broker-dealer    
Debt Instrument    
2021 9,139  
2022 8,978  
2023 8,557  
2024 4,089  
2025 4,643  
Thereafter 20,975  
Total $ 56,381