SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details 6) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows Between Transferor and Transferee
Gains (losses) recognized on the securitization	$ 0
U.S. government-sponsored agency guaranteed | Citicorp
Cash Flows Between Transferor and Transferee
Proceeds from new securitizations	65,800,000,000
Contractual servicing fees received	400,000,000
Cash flows received on retained interests and other net cash flows	100,000,000
Gains (losses) recognized on the securitization	154,000,000
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables
Weighted average discount rate, date of sale or securitization (as a percent)	10.10%	11.40%
Weighted average constant prepayment rate, date of sale or securitization (as a percent)	5.50%	10.20%
Key assumptions used in measuring fair value related to transferor's continuing involvement
Weighted average discount rate, transferor's continuing involvement (as a percent)	6.90%	6.10%
Weighted average constant prepayment rate, transferor's continuing involvement (as a percent)	11.10%	27.70%
Sensitivity analysis of fair value of interests continued to be held by transferor
Carrying value of retained interests	2,519,000,000	1,987,000,000
Carrying value of retained interests, impact of 10% adverse change in discount rate	(76,000,000)	(46,000,000)
Carrying value of retained interests, impact of 20% adverse change in discount rate	(148,000,000)	(90,000,000)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate	(96,000,000)	(110,000,000)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate	(187,000,000)	(211,000,000)
U.S. government-sponsored agency guaranteed | Citicorp | Low end of range
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables
Discount rate, date of sale or securitization (as a percent)	0.00%	0.20%
Constant prepayment rate, date of sale or securitization (as a percent)	0.00%	6.70%
Weighted average life, date of sale or securitization	0 years	1 year 9 months 18 days
Key assumptions used in measuring fair value related to transferor's continuing involvement
Discount rate, transferor's continuing involvement (as a percent)	0.10%	0.60%
Constant prepayment rate, transferor's continuing involvement (as a percent)	6.20%	9.00%
Weighted average life, transferor's continuing involvement	2 years 1 month 6 days	3 months 18 days
U.S. government-sponsored agency guaranteed | Citicorp | High end of range
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables
Discount rate, date of sale or securitization (as a percent)	12.40%	14.40%
Constant prepayment rate, date of sale or securitization (as a percent)	21.40%	36.40%
Weighted average life, date of sale or securitization	12 years 4 months 24 days	16 years
Key assumptions used in measuring fair value related to transferor's continuing involvement
Discount rate, transferor's continuing involvement (as a percent)	20.90%	17.20%
Constant prepayment rate, transferor's continuing involvement (as a percent)	30.40%	57.80%
Weighted average life, transferor's continuing involvement	14 years 1 month 6 days	18 years 3 months 18 days
U.S. government-sponsored agency guaranteed | Citi Holdings
Cash Flows Between Transferor and Transferee
Proceeds from new securitizations	200,000,000
Contractual servicing fees received	300,000,000
Gains (losses) recognized on the securitization	20,000,000	45,000,000	78,000,000
Key assumptions used in measuring fair value related to transferor's continuing involvement
Weighted average discount rate, transferor's continuing involvement (as a percent)	9.50%	9.70%
Weighted average constant prepayment rate, transferor's continuing involvement (as a percent)	20.00%	28.60%
Sensitivity analysis of fair value of interests continued to be held by transferor
Carrying value of retained interests	585,000,000	618,000,000
Carrying value of retained interests, impact of 10% adverse change in discount rate	(16,000,000)	(22,000,000)
Carrying value of retained interests, impact of 20% adverse change in discount rate	(32,000,000)	(42,000,000)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate	(33,000,000)	(57,000,000)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate	(65,000,000)	(109,000,000)
U.S. government-sponsored agency guaranteed | Citi Holdings | Low end of range
Key assumptions used in measuring fair value related to transferor's continuing involvement
Discount rate, transferor's continuing involvement (as a percent)	0.00%	0.00%
Constant prepayment rate, transferor's continuing involvement (as a percent)	9.60%	8.20%
Weighted average life, transferor's continuing involvement	2 years 3 months 18 days	2 years 2 months 12 days
U.S. government-sponsored agency guaranteed | Citi Holdings | High end of range
Key assumptions used in measuring fair value related to transferor's continuing involvement
Discount rate, transferor's continuing involvement (as a percent)	49.30%	52.70%
Constant prepayment rate, transferor's continuing involvement (as a percent)	26.20%	37.40%
Weighted average life, transferor's continuing involvement	7 years 7 months 6 days	7 years 9 months 18 days
Non-agency-sponsored mortgages | Citicorp
Cash Flows Between Transferor and Transferee
Proceeds from new securitizations	6,700,000,000
Gains (losses) recognized on the securitization	49,000,000
Senior interests | Citicorp
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables
Weighted average discount rate, date of sale or securitization (as a percent)	3.40%	8.10%
Weighted average constant prepayment rate, date of sale or securitization (as a percent)	7.20%	9.30%
Weighted average anticipated net credit losses, date of sale or securitization (as a percent)	49.30%	60.30%
Key assumptions used in measuring fair value related to transferor's continuing involvement
Weighted average discount rate, transferor's continuing involvement (as a percent)	5.50%	9.00%
Weighted average constant prepayment rate, transferor's continuing involvement (as a percent)	6.40%	12.30%
Weighted average anticipated credit losses, transferor's continuing involvement (as a percent)	49.50%	47.00%
Sensitivity analysis of fair value of interests continued to be held by transferor
Carrying value of retained interests	293,000,000	88,000,000
Carrying value of retained interests, impact of 10% adverse change in discount rate	(6,000,000)	(2,000,000)
Carrying value of retained interests, impact of 20% adverse change in discount rate	(11,000,000)	(4,000,000)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate	(1,000,000)	(1,000,000)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate	(2,000,000)	(3,000,000)
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses	(2,000,000)	(1,000,000)
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses	(3,000,000)	(3,000,000)
Senior interests | Citicorp | Low end of range
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables
Discount rate, date of sale or securitization (as a percent)	2.30%	1.20%
Constant prepayment rate, date of sale or securitization (as a percent)	5.40%	1.90%
Anticipated net credit losses, date of sale or securitization (as a percent)	47.20%	37.50%
Weighted average life, date of sale or securitization	2 years 10 months 24 days	4 months 24 days
Key assumptions used in measuring fair value related to transferor's continuing involvement
Discount rate, transferor's continuing involvement (as a percent)	0.50%	1.20%
Constant prepayment rate, transferor's continuing involvement (as a percent)	1.30%	1.90%
Anticipated credit losses, transferor's continuing involvement (as a percent)	0.10%	0.10%
Weighted average life, transferor's continuing involvement	0 years	4 months 24 days
Senior interests | Citicorp | High end of range
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables
Discount rate, date of sale or securitization (as a percent)	4.30%	24.00%
Constant prepayment rate, date of sale or securitization (as a percent)	10.00%	22.80%
Anticipated net credit losses, date of sale or securitization (as a percent)	53.00%	80.20%
Weighted average life, date of sale or securitization	9 years 8 months 12 days	11 years 2 months 12 days
Key assumptions used in measuring fair value related to transferor's continuing involvement
Discount rate, transferor's continuing involvement (as a percent)	17.40%	24.00%
Constant prepayment rate, transferor's continuing involvement (as a percent)	100.00%	24.90%
Anticipated credit losses, transferor's continuing involvement (as a percent)	80.00%	80.20%
Weighted average life, transferor's continuing involvement	11 years 10 months 24 days	11 years 2 months 12 days
Senior interests | Citi Holdings
Key assumptions used in measuring fair value related to transferor's continuing involvement
Discount rate, transferor's continuing involvement (as a percent)	9.90%
Weighted average discount rate, transferor's continuing involvement (as a percent)	9.90%	4.20%
Weighted average constant prepayment rate, transferor's continuing involvement (as a percent)	15.60%	21.70%
Anticipated credit losses, transferor's continuing involvement (as a percent)	0.30%	0.50%
Weighted average anticipated credit losses, transferor's continuing involvement (as a percent)	0.30%	0.50%
Weighted average life, transferor's continuing involvement	5 years 2 months 12 days
Sensitivity analysis of fair value of interests continued to be held by transferor
Carrying value of retained interests	50,000,000	39,000,000
Carrying value of retained interests, impact of 10% adverse change in discount rate	(3,000,000)
Carrying value of retained interests, impact of 20% adverse change in discount rate	(5,000,000)	(1,000,000)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate	(3,000,000)	(3,000,000)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate	(6,000,000)	(7,000,000)
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses	(5,000,000)	(9,000,000)
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses	(11,000,000)	(19,000,000)
Senior interests | Citi Holdings | Low end of range
Key assumptions used in measuring fair value related to transferor's continuing involvement
Discount rate, transferor's continuing involvement (as a percent)		4.10%
Constant prepayment rate, transferor's continuing involvement (as a percent)	12.30%	21.70%
Weighted average life, transferor's continuing involvement		2 years 1 month 6 days
Senior interests | Citi Holdings | High end of range
Key assumptions used in measuring fair value related to transferor's continuing involvement
Discount rate, transferor's continuing involvement (as a percent)		29.20%
Constant prepayment rate, transferor's continuing involvement (as a percent)	27.30%	26.00%
Weighted average life, transferor's continuing involvement		4 years 4 months 24 days
Subordinated interests | Citicorp
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables
Weighted average discount rate, date of sale or securitization (as a percent)	7.80%	13.80%
Weighted average constant prepayment rate, date of sale or securitization (as a percent)	7.50%	10.10%
Weighted average anticipated net credit losses, date of sale or securitization (as a percent)	49.20%	54.10%
Key assumptions used in measuring fair value related to transferor's continuing involvement
Weighted average discount rate, transferor's continuing involvement (as a percent)	11.20%	13.80%
Weighted average constant prepayment rate, transferor's continuing involvement (as a percent)	7.40%	10.00%
Weighted average anticipated credit losses, transferor's continuing involvement (as a percent)	52.80%	54.10%
Sensitivity analysis of fair value of interests continued to be held by transferor
Carrying value of retained interests	429,000,000	466,000,000
Carrying value of retained interests, impact of 10% adverse change in discount rate	(25,000,000)	(31,000,000)
Carrying value of retained interests, impact of 20% adverse change in discount rate	(48,000,000)	(59,000,000)
Carrying value of retained interests, impact of 10% adverse change in constant prepayment rate	(7,000,000)	(11,000,000)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate	(14,000,000)	(22,000,000)
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses	(7,000,000)	(13,000,000)
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses	(14,000,000)	(24,000,000)
Subordinated interests | Citicorp | Low end of range
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables
Discount rate, date of sale or securitization (as a percent)	0.10%	1.10%
Constant prepayment rate, date of sale or securitization (as a percent)	0.10%	1.60%
Anticipated net credit losses, date of sale or securitization (as a percent)	0.10%	33.40%
Weighted average life, date of sale or securitization	2 years 6 months	0 years
Key assumptions used in measuring fair value related to transferor's continuing involvement
Discount rate, transferor's continuing involvement (as a percent)	2.10%	1.10%
Constant prepayment rate, transferor's continuing involvement (as a percent)	1.40%	0.50%
Anticipated credit losses, transferor's continuing involvement (as a percent)	25.50%	33.40%
Weighted average life, transferor's continuing involvement	0 years	0 years
Subordinated interests | Citicorp | High end of range
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables
Discount rate, date of sale or securitization (as a percent)	19.20%	29.20%
Constant prepayment rate, date of sale or securitization (as a percent)	11.20%	29.40%
Anticipated net credit losses, date of sale or securitization (as a percent)	89.00%	90.00%
Weighted average life, date of sale or securitization	16 years 6 months	25 years 8 months 12 days
Key assumptions used in measuring fair value related to transferor's continuing involvement
Discount rate, transferor's continuing involvement (as a percent)	19.60%	29.20%
Constant prepayment rate, transferor's continuing involvement (as a percent)	23.10%	29.40%
Anticipated credit losses, transferor's continuing involvement (as a percent)	81.90%	90.00%
Weighted average life, transferor's continuing involvement	26 years	25 years 8 months 12 days
Subordinated interests | Citi Holdings
Key assumptions used in measuring fair value related to transferor's continuing involvement
Weighted average discount rate, transferor's continuing involvement (as a percent)		8.00%
Weighted average constant prepayment rate, transferor's continuing involvement (as a percent)		15.70%
Weighted average anticipated credit losses, transferor's continuing involvement (as a percent)		50.10%
Percentage of subordinated interests in mortgage securitizations	0.00%
Sensitivity analysis of fair value of interests continued to be held by transferor
Carrying value of retained interests		16,000,000
Carrying value of retained interests, impact of 10% adverse change in discount rate		(1,000,000)
Carrying value of retained interests, impact of 20% adverse change in discount rate		(2,000,000)
Carrying value of retained interests, impact of 20% adverse change in constant prepayment rate		(1,000,000)
Carrying value of retained interests, impact of 10% adverse change in anticipated net credit losses		(2,000,000)
Carrying value of retained interests, impact of 20% adverse change in anticipated net credit losses		(4,000,000)
Subordinated interests | Citi Holdings | Low end of range
Key assumptions used in measuring fair value related to transferor's continuing involvement
Discount rate, transferor's continuing involvement (as a percent)		3.40%
Constant prepayment rate, transferor's continuing involvement (as a percent)		12.70%
Anticipated credit losses, transferor's continuing involvement (as a percent)		50.00%
Weighted average life, transferor's continuing involvement		6 years
Subordinated interests | Citi Holdings | High end of range
Key assumptions used in measuring fair value related to transferor's continuing involvement
Discount rate, transferor's continuing involvement (as a percent)		12.40%
Constant prepayment rate, transferor's continuing involvement (as a percent)		18.70%
Anticipated credit losses, transferor's continuing involvement (as a percent)		50.10%
Weighted average life, transferor's continuing involvement		7 years 4 months 24 days
Mortgage-backed securities | Citicorp
Cash Flows Between Transferor and Transferee
Proceeds from new securitizations		56,500,000,000	57,300,000,000
Contractual servicing fees received		500,000,000	500,000,000
Cash flows received on retained interests and other net cash flows		100,000,000	100,000,000
Gains (losses) recognized on the securitization		30,000,000	(9,000,000)
Mortgage-backed securities | Citi Holdings
Cash Flows Between Transferor and Transferee
Proceeds from new securitizations		400,000,000	1,100,000,000
Contractual servicing fees received		400,000,000	600,000,000
Cash flows received on retained interests and other net cash flows			100,000,000
Collateralized debt obligations (CDOs) | Citi Holdings
Sensitivity analysis of fair value of interests continued to be held by transferor
Carrying value of retained interests	19,000,000	16,000,000
Carrying value of retained interests, impact of 10% adverse change in discount rate	(1,000,000)	(2,000,000)
Carrying value of retained interests, impact of 20% adverse change in discount rate	(2,000,000)	(3,000,000)
Collateralized debt obligations (CDOs) | Citi Holdings | Low end of range
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables
Discount rate, date of sale or securitization (as a percent)	44.30%	46.90%
Collateralized debt obligations (CDOs) | Citi Holdings | High end of range
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables
Discount rate, date of sale or securitization (as a percent)	48.70%	51.60%
Collateralized loan obligations (CLOs) | Citi Holdings
Sensitivity analysis of fair value of interests continued to be held by transferor
Carrying value of retained interests	1,365,000,000	428,000,000
Carrying value of retained interests, impact of 10% adverse change in discount rate	(7,000,000)	(2,000,000)
Carrying value of retained interests, impact of 20% adverse change in discount rate	(14,000,000)	(4,000,000)
Collateralized loan obligations (CLOs) | Citi Holdings | Low end of range
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables
Discount rate, date of sale or securitization (as a percent)	1.30%	1.90%
Collateralized loan obligations (CLOs) | Citi Holdings | High end of range
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables
Discount rate, date of sale or securitization (as a percent)	1.50%	2.10%
Asset-based financing | Citicorp
Cash Flows Between Transferor and Transferee
Proceeds from new securitizations	500,000,000
Key assumptions used in measuring fair value of retained interests at date of sale or securitization of mortgage receivables
Discount rate, date of sale or securitization (as a percent)	3.00%	3.20%
Sensitivity analysis of fair value of interests continued to be held by transferor
Carrying value of retained interests	1,316,000,000	1,726,000,000
Carrying value of retained interests, impact of 10% adverse change in discount rate	(11,000,000)	(22,000,000)
Carrying value of retained interests, impact of 20% adverse change in discount rate	(23,000,000)	(44,000,000)
Asset-based financing | Citi Holdings
Sensitivity analysis of fair value of interests continued to be held by transferor
Carrying value of retained interests	$ 95,000,000	$ 339,000,000