DISCONTINUED OPERATIONS (Details) (USD $)	3 Months Ended		9 Months Ended			1 Months Ended	3 Months Ended		9 Months Ended		0 Months Ended	3 Months Ended		9 Months Ended		0 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Feb. 28, 2013 Citi Capital Advisors Business	Sep. 30, 2013 Citi Capital Advisors Business	Sep. 30, 2012 Citi Capital Advisors Business	Sep. 30, 2013 Citi Capital Advisors Business item	Sep. 30, 2012 Citi Capital Advisors Business	Apr. 28, 2011 Egg Banking PLC	Sep. 30, 2013 Egg Banking PLC	Sep. 30, 2012 Egg Banking PLC	Sep. 30, 2013 Egg Banking PLC	Sep. 30, 2012 Egg Banking PLC	May 14, 2013 Brazil Creditcard	Sep. 30, 2013 Brazil Creditcard	Sep. 30, 2012 Brazil Creditcard	Sep. 30, 2013 Brazil Creditcard	Sep. 30, 2012 Brazil Creditcard	Sep. 30, 2013 German retail banking operations
Discontinued operations
Amount to be received on sale of discontinued operation																$ 1,240,000,000
Gain on sale of discontinued operations	6,000,000		62,000,000	(1,000,000)			6,000,000		62,000,000		126,000,000				(1,000,000)	250,000,000
Assets
Deposits at interest with banks																	82,000,000		82,000,000
Loans (net allowance of $359)																	2,699,000,000		2,699,000,000
Goodwill and intangible assets																	267,000,000		267,000,000
Other assets																	272,000,000		272,000,000
Total assets	3,320,000,000		3,320,000,000		36,000,000						2,700,000,000						3,320,000,000		3,320,000,000
Allowances on loans																	359,000,000		359,000,000
Results of Discontinued Operations
Total revenues, net of interest expense	231,000,000	259,000,000	811,000,000	800,000,000			8,000,000	11,000,000	73,000,000	11,000,000					1,000,000		223,000,000	248,000,000	738,000,000	788,000,000
Income (loss) from discontinued operations	33,000,000	(1,000,000)	(19,000,000)	27,000,000			(21,000,000)	(45,000,000)	(152,000,000)	(45,000,000)		(9,000,000)	(1,000,000)	(37,000,000)	(4,000,000)		36,000,000	45,000,000	143,000,000	76,000,000	27,000,000
Gain (loss) on sale	6,000,000		62,000,000	(1,000,000)			6,000,000		62,000,000		126,000,000				(1,000,000)	250,000,000
Income tax (Benefits)	(53,000,000)	(9,000,000)	(46,000,000)	(1,000,000)			(5,000,000)	(16,000,000)	(28,000,000)	(16,000,000)		(3,000,000)	(1,000,000)	(13,000,000)	(2,000,000)		12,000,000	6,000,000	49,000,000	12,000,000	(57,000,000)
Income from discontinued operations, net of taxes	92,000,000	8,000,000	89,000,000	27,000,000			(10,000,000)	(29,000,000)	(62,000,000)	(29,000,000)		(6,000,000)		(24,000,000)	(3,000,000)		24,000,000	39,000,000	94,000,000	64,000,000	85,000,000
Number of transactions									2
Number of management companies resulting from the sale of business									2
Ownership interest (as a percent)						24.90%
Liabilities
Total liabilities	$ 2,039,000,000		$ 2,039,000,000								$ 39,000,000