LOANS (Details 6) (USD $)	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013	Dec. 31, 2013
Loans receivable
Loans sold and/or reclassified to held-for-sale				$ 3,800,000,000		$ 10,200,000,000
Loans at fair value	4,804,000,000			4,804,000,000			5,029,000,000
Loans, net of unearned income	667,504,000,000			667,504,000,000			665,472,000,000
Corporate
Loans receivable
Loans sold and/or reclassified to held-for-sale	1,400,000,000		1,200,000,000	2,500,000,000		2,200,000,000
Number of days past due for reversal of accrued interest and charging to earnings				90 days		90 days
Loans, equal to 30- 89 days past due and accruing	401,000,000	[1]		401,000,000	[1]		311,000,000	[1]
Loans, greater than or equal to 90 days past due and accruing	214,000,000	[1]		214,000,000	[1]		183,000,000	[1]
Loans, total Past due and accruing	615,000,000			615,000,000			494,000,000
Loans, total non-accrual	1,218,000,000	[2]		1,218,000,000	[2]		1,908,000,000	[2]
Loans, total current	276,568,000,000	[3]		276,568,000,000	[3]		265,167,000,000	[3]
Loans at fair value	4,758,000,000	[4]		4,758,000,000	[4]		4,072,000,000	[4]
Loans, net of unearned income	283,159,000,000	[4]		283,159,000,000	[4]		271,641,000,000	[4]
Number of days past due, non-accrual status				90 days			90 days
Loans less than this number of days past due are considered current				30 days			30 days
Corporate | Commercial and industrial
Loans receivable
Loans, equal to 30- 89 days past due and accruing	229,000,000	[1]		229,000,000	[1]		72,000,000	[1]
Loans, greater than or equal to 90 days past due and accruing	1,000,000	[1]		1,000,000	[1]		5,000,000	[1]
Loans, total Past due and accruing	230,000,000			230,000,000			77,000,000
Loans, total non-accrual	618,000,000	[2]		618,000,000	[2]		769,000,000	[2]
Loans, total current	116,070,000,000	[3]		116,070,000,000	[3]		112,985,000,000	[3]
Loans, net of unearned income	116,918,000,000	[4]		116,918,000,000	[4]		113,831,000,000	[4]
Corporate | Financial institutions
Loans receivable
Loans, equal to 30- 89 days past due and accruing	0	[1]		0	[1]		0	[1]
Loans, greater than or equal to 90 days past due and accruing	0	[1]		0	[1]
Loans, total Past due and accruing	0			0			0
Loans, total non-accrual	257,000,000	[2]		257,000,000	[2]		365,000,000	[2]
Loans, total current	67,475,000,000	[3]		67,475,000,000	[3]		61,704,000,000	[3]
Loans, net of unearned income	67,732,000,000	[4]		67,732,000,000	[4]		62,069,000,000	[4]
Corporate | Mortgage and real estate
Loans receivable
Loans, equal to 30- 89 days past due and accruing	111,000,000	[1]		111,000,000	[1]		183,000,000	[1]
Loans, greater than or equal to 90 days past due and accruing	185,000,000	[1]		185,000,000	[1]		175,000,000	[1]
Loans, total Past due and accruing	296,000,000			296,000,000			358,000,000
Loans, total non-accrual	242,000,000	[2]		242,000,000	[2]		515,000,000	[2]
Loans, total current	37,084,000,000	[3]		37,084,000,000	[3]		34,027,000,000	[3]
Loans, net of unearned income	37,622,000,000	[4]		37,622,000,000	[4]		34,900,000,000	[4]
Corporate | Leases
Loans receivable
Loans, equal to 30- 89 days past due and accruing	9,000,000	[1]		9,000,000	[1]		9,000,000	[1]
Loans, greater than or equal to 90 days past due and accruing	0	[1]		0	[1]		1,000,000	[1]
Loans, total Past due and accruing	9,000,000			9,000,000			10,000,000
Loans, total non-accrual	49,000,000	[2]		49,000,000	[2]		189,000,000	[2]
Loans, total current	2,038,000,000	[3]		2,038,000,000	[3]		1,975,000,000	[3]
Loans, net of unearned income	2,096,000,000	[4]		2,096,000,000	[4]		2,174,000,000	[4]
Corporate | Other
Loans receivable
Loans, equal to 30- 89 days past due and accruing	52,000,000	[1]		52,000,000	[1]		47,000,000	[1]
Loans, greater than or equal to 90 days past due and accruing	28,000,000	[1]		28,000,000	[1]		2,000,000	[1]
Loans, total Past due and accruing	80,000,000			80,000,000			49,000,000
Loans, total non-accrual	52,000,000	[2]		52,000,000	[2]		70,000,000	[2]
Loans, total current	53,901,000,000	[3]		53,901,000,000	[3]		54,476,000,000	[3]
Loans, net of unearned income	$ 54,033,000,000	[4]		$ 54,033,000,000	[4]		$ 54,595,000,000	[4]

[1] Corporate loans that are 90 days past due are generally classified as non-accrual. Corporate loans are considered past due when principal or interest is contractually due but unpaid.

[2] Citi generally does not manage corporate loans on a delinquency basis. Non-accrual loans generally include those loans that are ≥ 90 days past due or those loans for which Citi believes, based on actual experience and a forward-looking assessment of the collectability of the loan in full, that the payment of interest or principal is doubtful.

[3] Corporate loans are past due when principal or interest is contractually due but unpaid. Loans less than 30 days past due are presented as current.

[4] Total loans include loans at fair value, which are not included in the various delinquency columns.