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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Schedule of Variable Interest Entities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Variable Interest Entity    
Total involvement with SPE assets $ 335,702 $ 319,569
Consolidated VIE / SPE assets 69,944 76,394
Significant unconsolidated VIE assets 265,758 243,175
Funded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, debt investments 34,043 31,331
Maximum exposure to loss in significant unconsolidated VIEs, equity investments 4,637 4,239
Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments 16,781 11,304
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives 73 140
Funded and Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs 55,534 47,014
Credit card securitizations    
Variable Interest Entity    
Total involvement with SPE assets 46,232 50,795
Consolidated VIE / SPE assets 46,232 50,795
Significant unconsolidated VIE assets 0 0
Funded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, debt investments 0 0
Maximum exposure to loss in significant unconsolidated VIEs, equity investments 0 0
Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments 0 0
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives 0 0
Funded and Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs 0 0
Mortgage securitizations - U.S. agency-sponsored    
Variable Interest Entity    
Total involvement with SPE assets 116,563 116,610
Consolidated VIE / SPE assets 0 0
Significant unconsolidated VIE assets 116,563 116,610
Funded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, debt investments 3,038 2,647
Maximum exposure to loss in significant unconsolidated VIEs, equity investments 0 0
Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments 0 0
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives 60 74
Funded and Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs 3,098 2,721
Mortgage securitizations - Non-agency-sponsored    
Variable Interest Entity    
Total involvement with SPE assets 30,886 22,251
Consolidated VIE / SPE assets 1,498 2,035
Significant unconsolidated VIE assets 29,388 20,216
Funded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, debt investments 431 330
Maximum exposure to loss in significant unconsolidated VIEs, equity investments 0 0
Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments 0 0
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives 1 1
Funded and Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs 432 331
Citi-administered asset-backed commercial paper conduits (ABCP)    
Variable Interest Entity    
Total involvement with SPE assets 18,750 19,282
Consolidated VIE / SPE assets 18,750 19,282
Significant unconsolidated VIE assets 0 0
Funded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, debt investments 0 0
Maximum exposure to loss in significant unconsolidated VIEs, equity investments 0 0
Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments 0 0
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives 0 0
Funded and Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs 0 0
Collateralized loan obligations (CLOs)    
Variable Interest Entity    
Total involvement with SPE assets 21,837 20,588
Consolidated VIE / SPE assets 0 0
Significant unconsolidated VIE assets 21,837 20,588
Funded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, debt investments 5,891 5,956
Maximum exposure to loss in significant unconsolidated VIEs, equity investments 0 0
Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments 0 0
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives 9 9
Funded and Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs 5,900 5,965
Asset-based financing    
Variable Interest Entity    
Total involvement with SPE assets 73,199 60,472
Consolidated VIE / SPE assets 628 633
Significant unconsolidated VIE assets 72,571 59,839
Funded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, debt investments 21,640 19,478
Maximum exposure to loss in significant unconsolidated VIEs, equity investments 715 583
Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments 9,757 5,878
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives 0 0
Funded and Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs 32,112 25,939
Municipal securities tender option bond trusts (TOBs)    
Variable Interest Entity    
Total involvement with SPE assets 7,998 6,925
Consolidated VIE / SPE assets 1,776 2,166
Significant unconsolidated VIE assets 6,222 4,759
Funded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, debt investments 9 138
Maximum exposure to loss in significant unconsolidated VIEs, equity investments 0 0
Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments 4,262 3,035
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives 0 0
Funded and Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs 4,271 3,173
Municipal investments    
Variable Interest Entity    
Total involvement with SPE assets 18,044 19,119
Consolidated VIE / SPE assets 3 7
Significant unconsolidated VIE assets 18,041 19,112
Funded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, debt investments 2,813 2,709
Maximum exposure to loss in significant unconsolidated VIEs, equity investments 3,922 3,640
Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments 2,738 2,344
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives 0 0
Funded and Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs 9,473 8,693
Client intermediation    
Variable Interest Entity    
Total involvement with SPE assets 858 958
Consolidated VIE / SPE assets 614 824
Significant unconsolidated VIE assets 244 134
Funded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, debt investments 172 32
Maximum exposure to loss in significant unconsolidated VIEs, equity investments 0 0
Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments 0 0
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives 2 9
Funded and Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs 174 41
Investment funds    
Variable Interest Entity    
Total involvement with SPE assets 1,272 1,892
Consolidated VIE / SPE assets 440 616
Significant unconsolidated VIE assets 832 1,276
Funded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, debt investments 12 14
Maximum exposure to loss in significant unconsolidated VIEs, equity investments 0 7
Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments 1 13
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives 1 0
Funded and Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs 14 34
Other    
Variable Interest Entity    
Total involvement with SPE assets 63 677
Consolidated VIE / SPE assets 3 36
Significant unconsolidated VIE assets 60 641
Funded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, debt investments 37 27
Maximum exposure to loss in significant unconsolidated VIEs, equity investments 0 9
Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs, funding commitments 23 34
Maximum exposure to loss in significant unconsolidated VIEs, guarantees and derivatives 0 47
Funded and Unfunded Exposure    
Maximum exposure to loss in significant unconsolidated VIEs 60 117
Mortgage-backed securities    
Funded and Unfunded Exposure    
Outstanding balance of mortgage loans securitized $ 7,000 $ 9,000