SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details 8) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Variable Interest Entity
Significant unconsolidated VIE assets	$ 577,828	$ 604,858
Maximum exposure	50,618	58,473
Citicorp | Commercial and other real estate | Asset-based financing
Variable Interest Entity
Significant unconsolidated VIE assets	3,300
Maximum exposure	1,300
Citi Holdings | Commercial and other real estate | Asset-based financing
Variable Interest Entity
Significant unconsolidated VIE assets	5,000
Maximum exposure	600
Citicorp | Hedge funds and equities | Asset-based financing
Variable Interest Entity
Significant unconsolidated VIE assets	6,200
Maximum exposure	2,400
Citi Holdings | Corporate loans | Asset-based financing
Variable Interest Entity
Significant unconsolidated VIE assets	5,000
Maximum exposure	4,200
Citicorp | Airplanes, ships and other assets | Asset-based financing
Variable Interest Entity
Significant unconsolidated VIE assets	7,000
Maximum exposure	5,700
Citi Holdings | Airplanes, ships and other assets | Asset-based financing
Variable Interest Entity
Significant unconsolidated VIE assets	2,900
Maximum exposure	1,000
Citicorp
Variable Interest Entity
Significant unconsolidated VIE assets	348,503	322,728
Maximum exposure	39,871	41,851
Citicorp | Asset-based financing
Variable Interest Entity
Significant unconsolidated VIE assets	16,500
Maximum exposure	9,400
Citi Holdings
Variable Interest Entity
Significant unconsolidated VIE assets	229,325	282,130
Maximum exposure	10,747	16,622
Citi Holdings | Asset-based financing
Variable Interest Entity
Significant unconsolidated VIE assets	12,900
Maximum exposure	$ 5,800