DERIVATIVES ACTIVITIES (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Net investment hedge under ASC 815 (SFAS 133)
Derivatives
Derivative notionals	$ 4,198		$ 6,450
Hedging instruments under ASC 815 (SFAS 133)
Derivatives
Derivative notionals	275,550	[1],[2]	235,193	[1],[2]
Hedging instruments under ASC 815 (SFAS 133) | Interest rate contracts
Derivatives
Derivative notionals	172,774	[1],[2]	132,843	[1],[2]
Hedging instruments under ASC 815 (SFAS 133) | Interest rate contracts | Swaps
Derivatives
Derivative notionals	172,774	[1],[2]	132,823	[1],[2]
Hedging instruments under ASC 815 (SFAS 133) | Interest rate contracts | Futures and forwards
Derivatives
Derivative notionals			20	[1],[2]
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts
Derivatives
Derivative notionals	101,575	[1],[2]	102,255	[1],[2]
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts | Swaps
Derivatives
Derivative notionals	25,923	[1],[2]	22,402	[1],[2]
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contracts | Futures and forwards
Derivatives
Derivative notionals	75,176	[1],[2]	79,646	[1],[2]
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contract options | Written or Sold
Derivatives
Derivative notionals	238	[1],[2]	101	[1],[2]
Hedging instruments under ASC 815 (SFAS 133) | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	238	[1],[2]	106	[1],[2]
Hedging instruments under ASC 815 (SFAS 133) | Commodity and other contracts
Derivatives
Derivative notionals	1,201	[1],[2]
Hedging instruments under ASC 815 (SFAS 133) | Commodity and other contracts | Futures and forwards
Derivatives
Derivative notionals	1,201	[1],[2]
Hedging instruments under ASC 815 (SFAS 133) | Credit derivatives
Derivatives
Derivative notionals			95	[1],[2],[3]
Hedging instruments under ASC 815 (SFAS 133) | Credit derivatives | Purchased
Derivatives
Derivative notionals			95	[1],[2],[3]
Other derivative instruments, Trading derivatives
Derivatives
Derivative notionals	61,531,844		59,871,634
Other derivative instruments, Trading derivatives | Interest rate contracts
Derivatives
Derivative notionals	48,004,125		49,083,760
Other derivative instruments, Trading derivatives | Interest rate contracts | Swaps
Derivatives
Derivative notionals	34,796,574		36,370,196
Other derivative instruments, Trading derivatives | Interest rate contracts | Futures and forwards
Derivatives
Derivative notionals	6,579,341		6,129,742
Other derivative instruments, Trading derivatives | Interest rate contract options | Written or Sold
Derivatives
Derivative notionals	3,349,604		3,342,832
Other derivative instruments, Trading derivatives | Interest rate contract options | Purchased
Derivatives
Derivative notionals	3,278,606		3,240,990
Other derivative instruments, Trading derivatives | Foreign exchange contracts
Derivatives
Derivative notionals	9,813,062		7,348,108
Other derivative instruments, Trading derivatives | Foreign exchange contracts | Swaps
Derivatives
Derivative notionals	4,405,719		3,298,500
Other derivative instruments, Trading derivatives | Foreign exchange contracts | Futures and forwards
Derivatives
Derivative notionals	2,240,032		1,982,303
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Written or Sold
Derivatives
Derivative notionals	1,573,970		1,037,433
Other derivative instruments, Trading derivatives | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals	1,593,341		1,029,872
Other derivative instruments, Trading derivatives | Equity contracts
Derivatives
Derivative notionals	855,916		723,695
Other derivative instruments, Trading derivatives | Equity contracts | Swaps
Derivatives
Derivative notionals	122,190		100,019
Other derivative instruments, Trading derivatives | Equity contracts | Futures and forwards
Derivatives
Derivative notionals	26,459		23,161
Other derivative instruments, Trading derivatives | Equity contract options | Written or Sold
Derivatives
Derivative notionals	374,468		333,945
Other derivative instruments, Trading derivatives | Equity contract options | Purchased
Derivatives
Derivative notionals	332,799		266,570
Other derivative instruments, Trading derivatives | Commodity and other contracts
Derivatives
Derivative notionals	495,504		377,485
Other derivative instruments, Trading derivatives | Commodity and other contracts | Swaps
Derivatives
Derivative notionals	161,538		81,112
Other derivative instruments, Trading derivatives | Commodity and other contracts | Futures and forwards
Derivatives
Derivative notionals	105,036		98,265
Other derivative instruments, Trading derivatives | Commodity and other contract options | Written or Sold
Derivatives
Derivative notionals	117,188		100,482
Other derivative instruments, Trading derivatives | Commodity and other contract options | Purchased
Derivatives
Derivative notionals	111,742		97,626
Other derivative instruments, Trading derivatives | Credit derivatives
Derivatives
Derivative notionals	2,363,237	[3]	2,338,586	[3]
Other derivative instruments, Trading derivatives | Credit derivatives | Written or Sold
Derivatives
Derivative notionals	1,161,986	[3]	1,143,363	[3]
Other derivative instruments, Trading derivatives | Credit derivatives | Purchased
Derivatives
Derivative notionals	1,201,251	[3]	1,195,223	[3]
Other derivative instruments, Management hedges
Derivatives
Derivative notionals	165,479	[4]	215,026	[4]
Other derivative instruments, Management hedges | Interest rate contracts
Derivatives
Derivative notionals	115,018	[4]	160,972	[4]
Other derivative instruments, Management hedges | Interest rate contracts | Swaps
Derivatives
Derivative notionals	68,093	[4]	93,286	[4]
Other derivative instruments, Management hedges | Interest rate contracts | Futures and forwards
Derivatives
Derivative notionals	38,233	[4]	61,398	[4]
Other derivative instruments, Management hedges | Interest rate contract options | Written or Sold
Derivatives
Derivative notionals	4,132	[4]	3,103	[4]
Other derivative instruments, Management hedges | Interest rate contract options | Purchased
Derivatives
Derivative notionals	4,560	[4]	3,185	[4]
Other derivative instruments, Management hedges | Foreign exchange contracts
Derivatives
Derivative notionals	35,033	[4]	34,310	[4]
Other derivative instruments, Management hedges | Foreign exchange contracts | Swaps
Derivatives
Derivative notionals	24,214	[4]	20,013	[4]
Other derivative instruments, Management hedges | Foreign exchange contracts | Futures and forwards
Derivatives
Derivative notionals	10,819	[4]	14,226	[4]
Other derivative instruments, Management hedges | Foreign exchange contract options | Purchased
Derivatives
Derivative notionals			71	[4]
Other derivative instruments, Management hedges | Credit derivatives
Derivatives
Derivative notionals	15,428	[3],[4]	19,744	[3],[4]
Other derivative instruments, Management hedges | Credit derivatives | Purchased
Derivatives
Derivative notionals	$ 15,428	[3],[4]	$ 19,744	[3],[4]

[1] The notional amounts presented in this table do not include hedge accounting relationships under ASC 815 where Citigroup is hedging the foreign currency risk of a net investment in a foreign operation by issuing a foreign-currency-denominated debt instrument. The notional amount of such debt was $4,198 million and $6,450 million at September 30, 2014 and December 31, 2013, respectively.

[2] Derivatives in hedge accounting relationships accounted for under ASC 815 are recorded in either Other assets/Other liabilities or Trading account assets/Trading account liabilities on the Consolidated Balance Sheet.

[3] Credit derivatives are arrangements designed to allow one party (protection buyer) to transfer the credit risk of a “reference asset” to another party (protection seller). These arrangements allow a protection seller to assume the credit risk associated with the reference asset without directly purchasing that asset. The Company has entered into credit derivative positions for purposes such as risk management, yield enhancement, reduction of credit concentrations and diversification of overall risk.

[4] Management hedges represent derivative instruments used in certain economic hedging relationships that are identified for management purposes, but for which hedge accounting is not applied. These derivatives are recorded in either Other assets/Other liabilities or Trading account assets/Trading account liabilities on the Consolidated Balance Sheet.