DEBT (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2014
Trust Preferred Securities
Liquidation value	$ 2,602	[1]
Junior subordinated debentures owned by the Trust, amount	2,608
Citigroup Capital III
Trust Preferred Securities
Securities issued (in shares)	194,053
Liquidation value	194	[1]
Coupon rate (as a percent)	7.625%	[2]
Common shares issued to parent (in shares)	6,003
Junior subordinated debentures owned by the Trust, amount	200
Citigroup Capital XIII
Trust Preferred Securities
Securities issued (in shares)	89,840,000
Liquidation value	2,246	[1]
Coupon rate (as a percent)	7.875%	[2]
Common shares issued to parent (in shares)	1,000
Junior subordinated debentures owned by the Trust, amount	2,246
Citigroup Capital XVIII
Trust Preferred Securities
Securities issued (in shares)	99,901
Liquidation value	162	[1]
Coupon rate (as a percent)	6.829%	[2]
Common shares issued to parent (in shares)	50
Junior subordinated debentures owned by the Trust, amount	$ 162

[1] Represents the notional value received by investors from the trusts at the time of issuance.

[2] In each case, the coupon rate on the subordinated debentures is the same as that on the trust preferred securities.