DISCONTINUED OPERATIONS (Details) (USD $)	3 Months Ended								12 Months Ended			0 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 20, 2013 Brazil Creditcard	Dec. 31, 2013 Brazil Creditcard	Dec. 31, 2012 Brazil Creditcard	Dec. 31, 2011 Brazil Creditcard	Feb. 28, 2013 Citi Capital Advisors Business	Dec. 31, 2013 Citi Capital Advisors Business item	Dec. 31, 2012 Citi Capital Advisors Business	Apr. 30, 2011 Egg Banking PLC	Dec. 31, 2013 Egg Banking PLC	Dec. 31, 2012 Egg Banking PLC	Dec. 31, 2011 Egg Banking PLC	Sep. 30, 2013 German retail banking operations	Dec. 31, 2013 German retail banking operations
Discontinued operations
Amount to be received on sale of discontinued operation												$ 1,240,000,000
After tax gain on sale of discontinued operations									268,000,000	(1,000,000)	155,000,000	325,000,000							126,000,000
After-tax benefit and the gain on sale												189,000,000
Results of Discontinued Operations
Total revenues, net of interest expense									1,086,000,000	1,106,000,000	1,374,000,000		1,012,000,000	1,045,000,000	1,022,000,000		74,000,000	60,000,000			1,000,000	340,000,000
Income (loss) from discontinued operations									(242,000,000)	(109,000,000)	(75,000,000)		(48,000,000)	110,000,000	(98,000,000)		(158,000,000)	(123,000,000)		(62,000,000)	(96,000,000)	24,000,000	27,000,000
Gain on sale									268,000,000	(1,000,000)	155,000,000	206,000,000	206,000,000				62,000,000				(1,000,000)	143,000,000
Income tax (Benefits)									(244,000,000)	(52,000,000)	12,000,000		(138,000,000)	19,000,000	(54,000,000)		(30,000,000)	(44,000,000)		(22,000,000)	(34,000,000)	58,000,000	(57,000,000)
Income (loss) from discontinued operations, net of taxes	181,000,000	92,000,000	30,000,000	(33,000,000)	(85,000,000)	8,000,000	7,000,000	12,000,000	270,000,000	(58,000,000)	68,000,000		296,000,000	91,000,000	(44,000,000)		(66,000,000)	(79,000,000)		(40,000,000)	(63,000,000)	109,000,000	85,000,000
Discontinued operations
Cash flows from operating activities									154,000,000	(209,000,000)	(118,000,000)		197,000,000	(205,000,000)	28,000,000		(43,000,000)	(4,000,000)				(146,000,000)
Cash flows from investing activities									(207,000,000)	199,000,000	2,783,000,000		(207,000,000)	195,000,000	(44,000,000)			4,000,000				2,827,000,000
Cash flows from financing activities									43,000,000	16,000,000	(12,000,000)			16,000,000			43,000,000					(12,000,000)
Net cash provided by (used in) discontinued operations									(10,000,000)	6,000,000	2,653,000,000		(10,000,000)	6,000,000	(16,000,000)							2,669,000,000
Number of transactions																	2
Number of management companies resulting from the sale of business																	2
Ownership interest (as a percent)																24.90%
Total assets					36,000,000					36,000,000		3,500,000,000							2,700,000,000
Liabilities
Total liabilities	0								0										39,000,000
Residual costs associated with banking operations, before tax																								26,000,000
Residual costs associated with banking operations, tax expense (benefit)																								54,000,000
After tax residual costs associated with banking operations																								$ 80,000,000