DISCONTINUED OPERATIONS AND SIGNIFICANT DISPOSALS (Details) (USD $)	3 Months Ended				6 Months Ended				0 Months Ended	3 Months Ended				6 Months Ended					1 Months Ended	3 Months Ended				6 Months Ended			12 Months Ended		3 Months Ended				6 Months Ended				3 Months Ended	6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 20, 2013 Brazil Creditcard	Jun. 30, 2014 Brazil Creditcard		Jun. 30, 2013 Brazil Creditcard		Jun. 30, 2014 Brazil Creditcard		Jun. 30, 2013 Brazil Creditcard		Dec. 20, 2013 Brazil Creditcard	Feb. 28, 2013 Citi Capital Advisors Business	Jun. 30, 2014 Citi Capital Advisors Business		Jun. 30, 2013 Citi Capital Advisors Business		Jun. 30, 2014 Citi Capital Advisors Business		Jun. 30, 2013 Citi Capital Advisors Business	Dec. 31, 2013 Citi Capital Advisors Business company transaction		Jun. 30, 2014 Egg Banking PLC		Jun. 30, 2013 Egg Banking PLC		Jun. 30, 2014 Egg Banking PLC		Jun. 30, 2013 Egg Banking PLC		Sep. 30, 2013 German retail banking operations	Jun. 30, 2014 German retail banking operations
Discontinued operations
Amount to be received on sale of discontinued operation																		$ 1,240,000,000
Gain on sale	0		0		0		56,000,000		206,000,000											0		0		0			56,000,000
After tax gain on sale of discontinued operations	0		0		0		56,000,000		325,000,000
Results of Discontinued Operations
Total revenues, net of interest expense	4,000,000	[1]	258,000,000	[1]	73,000,000	[1]	580,000,000	[1]		0	[1]	251,000,000	[1]	69,000,000	[1]	515,000,000	[1]			0	[1]	7,000,000	[1]	0	[1]		65,000,000	[1]	4,000,000	[1]	0	[1]	4,000,000	[1]	0	[1]
Income (loss) from discontinued operations	(3,000,000)		51,000,000		37,000,000		(52,000,000)			5,000,000		55,000,000		69,000,000		107,000,000				(1,000,000)		(3,000,000)		(4,000,000)			(131,000,000)		(7,000,000)		(1,000,000)		(28,000,000)		(28,000,000)		27,000,000
Income tax (Benefits)	19,000,000		21,000,000		22,000,000		7,000,000			2,000,000		19,000,000		13,000,000		37,000,000				(1,000,000)		(1,000,000)		(2,000,000)			(23,000,000)		(2,000,000)		0		(9,000,000)		(10,000,000)		(57,000,000)
Income (loss) from discontinued operations, net of taxes	(22,000,000)		30,000,000		15,000,000		(3,000,000)			3,000,000		36,000,000		56,000,000		70,000,000				0		(2,000,000)		(2,000,000)			(52,000,000)		(5,000,000)		(1,000,000)		(19,000,000)		(18,000,000)		85,000,000
Discontinued operations
Cash flows from operating activities					0		(338,000,000)							0		(296,000,000)								0		(42,000,000)
Cash flows from investing activities					0		282,000,000							0		282,000,000								0		0
Cash flows from financing activities					0		41,000,000							0		(1,000,000)								0		42,000,000
Net cash provided by (used in) discontinued operations					0		(15,000,000)							0		(15,000,000)								0		0
Number of transactions																											2
Number of management companies resulting from the sale of business																											2
Ownership interest (as a percent)																			24.90%
Disposal Group Including Discontinued Operation Residual Costs Associated with Banking Operations Tax Effect																																						$ 20,000,000

[1] Total revenues include gain or loss on sale, if applicable.