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RETIREMENT BENEFITS - Post Employment and Defined Contribution Plans (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Contribution Plans      
Maximum percentage contribution by employer of employees eligible pay 6.00% 6.00%  
Maximum compensation to be eligible for fixed contribution from employer $ 100,000    
Percentage of fixed contribution by employer, for eligible employees whose compensation is $100,000 or less 2.00%    
U.S. Postretirement Benefit Plans      
Defined Benefit Plan Disclosure      
Postemployment Benefits Liability $ (183,000,000) $ (256,000,000)  
Amount recognized in accumulated other comprehensive income (loss) 45,000,000 24,000,000  
Amortization of unrecognized      
Total net expense $ 30,000,000 $ 32,000,000 $ 30,000,000
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]      
Discount rate (as a percent) 4.20% 3.80%  
Health care cost increase following year (as a percent) 7.00% 7.50%  
Ultimate rate to which cost increase is assumed to decline (as a percent) 5.00% 5.00%  
Year in which the ultimate rate is reached 2020 2020  
U.S. Postretirement Benefit Plans      
Defined Benefit Plan, Net Periodic Benefit Cost      
Benefits earned during the year $ 0 $ 0 20,000,000
Interest cost on benefit obligation 4,000,000 5,000,000 10,000,000
Amortization of unrecognized      
Prior service benefit (31,000,000) (31,000,000) (3,000,000)
Net actuarial loss 12,000,000 14,000,000 17,000,000
Total service-related benefit (15,000,000) (12,000,000) 44,000,000
Non-service-related (benefit) expense 3,000,000 37,000,000 (14,000,000)
Total net expense $ (12,000,000) $ 25,000,000 30,000,000
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]      
Discount rate (as a percent) 3.70% 3.45%  
Health care cost increase following year (as a percent) 7.00% 7.50%  
Ultimate rate to which cost increase is assumed to decline (as a percent) 5.00% 5.00%  
Year in which the ultimate rate is reached 2020 2020  
Non-U.S. Postretirement Benefit Plans      
Amortization of unrecognized      
Total net expense $ 46,000,000 $ 41,000,000 103,000,000
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]      
Health care cost increase following year (as a percent) 6.87% 6.94%  
Ultimate rate to which cost increase is assumed to decline (as a percent) 6.86% 6.93%  
U.S. Postretirement Benefit Plans      
Defined Contribution Plans      
Pretax expense associated with Citigroup 401(k) plan $ 380,000,000 $ 383,000,000 394,000,000
Non-U.S. Postretirement Benefit Plans      
Defined Contribution Plans      
Pretax expense associated with Citigroup 401(k) plan $ 375,000,000 $ 385,000,000 $ 402,000,000