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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Asset-Backed Commercial Paper Conduits (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Classification of Other Securitization Details    
Commercial paper $ 9,940,000,000 $ 9,989,000,000
Citi-administered asset-backed commercial paper conduits (ABCP)    
Classification of Other Securitization Details    
Purchased assets outstanding under conduits 19,300,000,000 19,700,000,000
Incremental funding commitments with clients $ 14,500,000,000 $ 12,800,000,000
Weighted average life of commercial paper issued by conduits 51 days 55 days
Citi-administered asset-backed commercial paper conduits (ABCP) | Minimum    
Classification of Other Securitization Details    
Letters of credit as percentage of conduit assets 8.00%  
Floor price of conduit's assets $ 200,000,000  
Citi-administered asset-backed commercial paper conduits (ABCP) | Maximum    
Classification of Other Securitization Details    
Letters of credit as percentage of conduit assets 10.00%  
Citi-administered asset-backed consolidated commercial paper conduits (ABCP)    
Classification of Other Securitization Details    
Letters of credit provided to conduits $ 1,700,000,000 $ 1,800,000,000
Commercial paper $ 9,300,000,000 $ 9,700,000,000