RETIREMENT BENEFITS (Details 5) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Defined Contribution Plans
Maximum percentage contribution by employer of employees eligible pay			6.00%	6.00%
Maximum compensation to be eligible for fixed contribution from employer			$ 100,000
Percentage of fixed contribution by employer, for eligible employees whose compensation is $100,000 or less			2.00%
Pretax expense associated with Citigroup 401(k) plan	101,000,000	98,000,000	204,000,000	202,000,000
Postemployment Plans
Postemployment Plans
Benefits earned during the period	0	6,000,000	0	13,000,000
Interest cost on benefit obligation	1,000,000	3,000,000	2,000,000	6,000,000
Amortization of unrecognized
Prior service cost (benefit)	(8,000,000)	2,000,000	(15,000,000)	4,000,000
Net actuarial loss	3,000,000	3,000,000	7,000,000	6,000,000
Total service related expense	(4,000,000)	14,000,000	(6,000,000)	29,000,000
Non-service related expense (benefit)	8,000,000	6,000,000	17,000,000	13,000,000
Total net (benefit) expense	$ 4,000,000	$ 20,000,000	$ 11,000,000	$ 42,000,000