REGULATORY CAPITAL AND CITIGROUP INC. PARENT COMPANY INFORMATION (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Regulatory capital requirement
Tier 1 Common	$ 138,070,000,000
Tier 1 Capital	149,444,000,000
Total Capital	181,958,000,000
Risk-weighted assets	1,092,707,000,000
Quarterly adjusted average total assets	1,820,998,000,000
Required minimum tier 1 capital ratio (as a percent)	4.00%
Well-capitalized minimum tier 1 capital ratio (as a percent)	6.00%
Required minimum total capital ratio (as a percent)	8.00%
Well-capitalized minimum total capital ratio (as a percent)	10.00%
Tier 1 Common ratio (as a percent)	12.64%
Tier 1 Capital ratio (as a percent)	13.68%
Total Capital ratio (as a percent)	16.65%
Required minimum leverage ratio (as a percent)	3.00%
Well-capitalized minimum leverage ratio (as a percent)	5.00%
Leverage ratio (as a percent)	8.21%
Dividend received from Citibank	12,200,000,000	19,100,000,000
Citibank, N.A.
Regulatory capital requirement
Tier 1 Common	121,713,000,000
Tier 1 Capital	122,450,000,000
Total Capital	141,341,000,000
Risk-weighted assets	905,836,000,000
Quarterly adjusted average total assets	1,317,673,000,000
Tier 1 Common ratio (as a percent)	13.44%
Tier 1 Capital ratio (as a percent)	13.52%
Total Capital ratio (as a percent)	15.60%
Leverage ratio (as a percent)	9.29%
Citigroup Global Markets Holdings Inc. (CGMHI)
Regulatory capital requirement
Net capital or equivalent	5,376,000,000
Excess over minimum requirement	4,546,000,000
Citigroup Global Markets Limited
Regulatory capital requirement
Net capital or equivalent	7,425,000,000
Excess over minimum requirement	$ 4,333,000,000