DEBT (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Trust Preferred Securities
Liquidation value	$ 4,731
Junior subordinated debentures owned by the Trust, proceeds received from the Trust at the date of issuance	4,781
Citigroup Capital III
Trust Preferred Securities
Securities issued (in shares)	194,053
Liquidation value	194
Coupon rate (as a percent)	7.625%
Common shares issued to parent	6,003
Junior subordinated debentures owned by the Trust, proceeds received from the Trust at the date of issuance	200
Citigroup Capital IX
Trust Preferred Securities
Securities issued (in shares)	33,874,813
Liquidation value	847
Coupon rate (as a percent)	6.00%
Common shares issued to parent	1,047,675
Junior subordinated debentures owned by the Trust, proceeds received from the Trust at the date of issuance	873
Citigroup Capital XI
Trust Preferred Securities
Securities issued (in shares)	18,387,128
Liquidation value	460
Coupon rate (as a percent)	6.00%
Common shares issued to parent	568,675
Junior subordinated debentures owned by the Trust, proceeds received from the Trust at the date of issuance	474
Citigroup Capital XIII
Trust Preferred Securities
Securities issued (in shares)	89,840,000
Liquidation value	2,246
Coupon rate (as a percent)	7.875%
Common shares issued to parent	1,000
Junior subordinated debentures owned by the Trust, proceeds received from the Trust at the date of issuance	2,246
Citigroup Capital XVII
Trust Preferred Securities
Securities issued (in shares)	28,047,927
Liquidation value	701
Coupon rate (as a percent)	6.35%
Common shares issued to parent	20,000
Junior subordinated debentures owned by the Trust, proceeds received from the Trust at the date of issuance	702
Citigroup Capital XVIII
Trust Preferred Securities
Securities issued (in shares)	99,901
Liquidation value	165
Coupon rate (as a percent)	6.829%
Common shares issued to parent	50
Junior subordinated debentures owned by the Trust, proceeds received from the Trust at the date of issuance	165
Adam Capital Trust III
Trust Preferred Securities
Securities issued (in shares)	17,500
Liquidation value	18
Description of coupon rate basis	three months LIBOR
Coupon rate, basis spread (as a percent)	3.35%
Common shares issued to parent	542
Junior subordinated debentures owned by the Trust, proceeds received from the Trust at the date of issuance	18
Adam Statutory Trust III
Trust Preferred Securities
Securities issued (in shares)	25,000
Liquidation value	25
Description of coupon rate basis	three months LIBOR
Coupon rate, basis spread (as a percent)	3.25%
Common shares issued to parent	774
Junior subordinated debentures owned by the Trust, proceeds received from the Trust at the date of issuance	26
Adam Statutory Trust IV
Trust Preferred Securities
Securities issued (in shares)	40,000
Liquidation value	40
Description of coupon rate basis	three months LIBOR
Coupon rate, basis spread (as a percent)	2.95%
Common shares issued to parent	1,238
Junior subordinated debentures owned by the Trust, proceeds received from the Trust at the date of issuance	41
Adam Statutory Trust V
Trust Preferred Securities
Securities issued (in shares)	35,000
Liquidation value	35
Description of coupon rate basis	three months LIBOR
Coupon rate, basis spread (as a percent)	2.79%
Common shares issued to parent	1,083
Junior subordinated debentures owned by the Trust, proceeds received from the Trust at the date of issuance	$ 36