CONDENSED CONSOLIDATING FINANCIAL STATEMENTS OF CASH FLOWS (Details 3) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities of continuing operations	$ 7,564	$ 30,820
Cash flows from investing activities of continuing operations
Change in loans	(13,555)	(6,389)
Proceeds from sales of loans	4,874	8,941
Purchases of investments	(188,566)	(254,411)
Proceeds from sales of investments	114,234	159,154
Proceeds from maturities of investments	80,193	112,409
Other investing activities	(15,243)	192
Net cash (used in) provided by investing activities of continuing operations	(18,063)	19,896
Cash flows from financing activities of continuing operations
Dividends paid	(104)	(69)
Treasury stock acquired	(4)	(1)
Proceeds / (repayments) from issuance of long-term debt-third-party, net	(57,927)	(49,791)
Change in deposits	78,708	6,326
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	(5,027)	(13,872)
Other financing activities	(194)	3,522
Net cash provided by (used in) financing activities of continuing operations	15,452	(53,885)
Effect of exchange rate changes on cash and due from banks	148	1,478
Net cash provided by (used in) discontinued operations		2,669
Change in cash and due from banks	5,101	978
Cash and due from banks at beginning of period	28,701	27,972
Cash and due from banks at end of period	33,802	28,950
Cash paid during the year for:
Income taxes	2,582	2,617
Interest	15,185	15,382
Non-cash investing activities
Transfers to repossessed assets	391	1,038
Transfers to trading accounting assets from investments (held-to-maturity)		12,700
Citigroup Parent Company
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities of continuing operations	(26,455)	(9,397)
Cash flows from investing activities of continuing operations
Purchases of investments	(5,701)	(31,805)
Proceeds from sales of investments	37,056	3,079
Proceeds from maturities of investments	4,190	20,292
Changes in investments and advances-intercompany	16,380	31,088
Business acquisitions		(10)
Other investing activities	1
Net cash (used in) provided by investing activities of continuing operations	51,926	22,644
Cash flows from financing activities of continuing operations
Dividends paid	(104)	(75)
Treasury stock acquired	(4)	(1)
Proceeds / (repayments) from issuance of long-term debt-third-party, net	(27,224)	(13,602)
Net change in short-term borrowings and other advances-intercompany	2,089	(3,100)
Other financing activities	(194)	3,522
Net cash provided by (used in) financing activities of continuing operations	(25,437)	(13,256)
Change in cash and due from banks	34	(9)
Cash and due from banks at beginning of period	3	11
Cash and due from banks at end of period	37	2
Cash paid during the year for:
Income taxes	40	115
Interest	5,981	6,899
Citigroup Funding Inc. (CFI)
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities of continuing operations	452	2,189
Cash flows from investing activities of continuing operations
Change in loans	14,822	31,465
Net cash (used in) provided by investing activities of continuing operations	14,822	31,465
Cash flows from financing activities of continuing operations
Proceeds / (repayments) from issuance of long-term debt-third-party, net	(7,978)	(4,161)
Proceeds / (repayments) from issuance of long-term debt-intercompany, net	1,930	32
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	(6,329)	(1,007)
Net change in short-term borrowings and other advances-intercompany	(2,888)	(28,441)
Other financing activities	67	(77)
Net cash provided by (used in) financing activities of continuing operations	(15,198)	(33,654)
Change in cash and due from banks	76
Cash and due from banks at end of period	76
Cash paid during the year for:
Income taxes	56	(326)
Interest	861	464
Other Citigroup Subsidiaries and eliminations
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities of continuing operations	33,567	38,028
Cash flows from investing activities of continuing operations
Change in loans	(28,377)	(37,854)
Proceeds from sales of loans	4,874	8,941
Purchases of investments	(182,865)	(222,606)
Proceeds from sales of investments	77,178	156,075
Proceeds from maturities of investments	76,003	92,117
Changes in investments and advances-intercompany	(16,380)	(31,088)
Business acquisitions		10
Other investing activities	(15,244)	192
Net cash (used in) provided by investing activities of continuing operations	(84,811)	(34,213)
Cash flows from financing activities of continuing operations
Dividends paid		6
Proceeds / (repayments) from issuance of long-term debt-third-party, net	(22,725)	(32,028)
Proceeds / (repayments) from issuance of long-term debt-intercompany, net	(1,930)	(32)
Change in deposits	78,708	6,326
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	1,302	(12,865)
Net change in short-term borrowings and other advances-intercompany	799	31,541
Other financing activities	(67)	77
Net cash provided by (used in) financing activities of continuing operations	56,087	(6,975)
Effect of exchange rate changes on cash and due from banks	148	1,478
Net cash provided by (used in) discontinued operations		2,669
Change in cash and due from banks	4,991	987
Cash and due from banks at beginning of period	28,698	27,961
Cash and due from banks at end of period	33,689	28,948
Cash paid during the year for:
Income taxes	2,486	2,828
Interest	8,343	8,019
Non-cash investing activities
Transfers to repossessed assets	391	1,038
Transfers to trading accounting assets from investments (held-to-maturity)		$ 12,700