CONDENSED CONSOLIDATING FINANCIAL STATEMENTS OF CASH FLOWS (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities of continuing operations	$ 5,498	$ 1,039
Cash flows from investing activities of continuing operations
Change in loans	(3,858)	5,624
Proceeds from sales of loans	1,043	1,824
Purchases of investments	(62,929)	(105,554)
Proceeds from sales of investments	31,006	35,185
Proceeds from maturities of investments	29,165	47,361
Other investing activities	(28,846)	(1,432)
Net cash used in investing activities of continuing operations	(34,419)	(16,992)
Cash flows from financing activities of continuing operations
Dividends paid	(34)	(4)
Treasury stock acquired	(4)
Proceeds / (repayments) from issuance of long-term debt-third-party, net	(15,443)	(5,999)
Change in deposits	40,076	20,908
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	1,920	(1,068)
Other financing activities	(187)	1,655
Net cash provided by financing activities of continuing operations	26,328	15,492
Effect of exchange rate changes on cash and due from banks	397	331
Change in cash and due from banks	(2,196)	(130)
Cash and due from banks at beginning of period	28,701	27,972
Cash and due from banks at end of period	26,505	27,842
Cash paid during the year for:
Income taxes	916	874
Interest	4,602	4,608
Non-cash investing activities
Transfers to repossessed assets	137	432
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	2,666	(2,678)
Cash flows from investing activities of continuing operations
Purchases of investments	(5,131)	(10,662)
Proceeds from sales of investments	1,662	1,549
Proceeds from maturities of investments	3,508	8,796
Changes in investments and advances-intercompany	4,426	(550)
Net cash used in investing activities of continuing operations	4,465	(867)
Cash flows from financing activities of continuing operations
Dividends paid	(34)	(4)
Treasury stock acquired	(4)
Proceeds / (repayments) from issuance of long-term debt-third-party, net	(4,036)	(3,259)
Net change in short-term borrowings and other advances-intercompany	(2,364)	5,146
Other financing activities	(184)	1,655
Net cash provided by financing activities of continuing operations	(6,622)	3,538
Change in cash and due from banks	509	(7)
Cash and due from banks at beginning of period	3	11
Cash and due from banks at end of period	512	4
Cash paid during the year for:
Income taxes	(230)	72
Interest	2,013	2,276
Citigroup Global Markets Holdings Inc. (CGMHI)
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities of continuing operations	(515)	1,890
Cash flows from investing activities of continuing operations
Proceeds from sales of loans	2
Proceeds from sales of investments	20
Changes in investments and advances-intercompany	563	(667)
Other investing activities	927	16,111
Net cash used in investing activities of continuing operations	1,512	15,444
Cash flows from financing activities of continuing operations
Proceeds / (repayments) from issuance of long-term debt-third-party, net	(1,204)	(119)
Proceeds / (repayments) from issuance of long-term debt-intercompany, net	(1,343)	7,907
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	473	38
Net change in short-term borrowings and other advances-intercompany	1,405	(24,208)
Capital contributions from parent		(525)
Net cash provided by financing activities of continuing operations	(669)	(16,907)
Change in cash and due from banks	328	427
Cash and due from banks at beginning of period	4,200	5,220
Cash and due from banks at end of period	4,528	5,647
Cash paid during the year for:
Income taxes	11	53
Interest	1,583	948
Non-cash investing activities
Transfers to repossessed assets	76	39
Citigroup Funding Inc. (CFI)
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities of continuing operations	428	413
Cash flows from investing activities of continuing operations
Change in loans	2,118	21,605
Net cash used in investing activities of continuing operations	2,118	21,605
Cash flows from financing activities of continuing operations
Proceeds / (repayments) from issuance of long-term debt-third-party, net	(1,897)	1,786
Proceeds / (repayments) from issuance of long-term debt-intercompany, net	478
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	(220)	(769)
Net change in short-term borrowings and other advances-intercompany	(903)	(23,035)
Other financing activities	(4)
Net cash provided by financing activities of continuing operations	(2,546)	(22,018)
Cash paid during the year for:
Income taxes	50	(121)
Interest	324	138
CitiFinancial Credit Company (CCC)
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities of continuing operations	(34)	329
Cash flows from investing activities of continuing operations
Change in loans	454	907
Proceeds from sales of loans	2
Purchases of investments	(155)	(140)
Proceeds from sales of investments	429	27
Proceeds from maturities of investments	55	93
Changes in investments and advances-intercompany	(109)	42
Net cash used in investing activities of continuing operations	676	929
Cash flows from financing activities of continuing operations
Proceeds / (repayments) from issuance of long-term debt-third-party, net	750	(153)
Proceeds / (repayments) from issuance of long-term debt-intercompany, net	921	(2,476)
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	(750)
Net change in short-term borrowings and other advances-intercompany	(1,599)	1,590
Net cash provided by financing activities of continuing operations	(678)	(1,039)
Change in cash and due from banks	(36)	219
Cash and due from banks at beginning of period	372	323
Cash and due from banks at end of period	336	542
Cash paid during the year for:
Income taxes	12
Interest	438	706
Non-cash investing activities
Transfers to repossessed assets	27	212
Associates
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities of continuing operations	1,061	219
Cash flows from investing activities of continuing operations
Change in loans	504	1,365
Proceeds from sales of loans	2
Purchases of investments	(155)	(140)
Proceeds from sales of investments	429	27
Proceeds from maturities of investments	55	93
Changes in investments and advances-intercompany	(1,696)	(2,986)
Net cash used in investing activities of continuing operations	(861)	(1,641)
Cash flows from financing activities of continuing operations
Proceeds / (repayments) from issuance of long-term debt-third-party, net	(10)	(90)
Proceeds / (repayments) from issuance of long-term debt-intercompany, net	1,504	(95)
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	(811)	89
Net change in short-term borrowings and other advances-intercompany	(920)	1,808
Net cash provided by financing activities of continuing operations	(237)	1,712
Change in cash and due from banks	(37)	290
Cash and due from banks at beginning of period	429	398
Cash and due from banks at end of period	392	688
Cash paid during the year for:
Income taxes	28	39
Interest	300	117
Non-cash investing activities
Transfers to repossessed assets	37	227
Other Citigroup Subsidiaries and eliminations
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities of continuing operations	1,858	1,195
Cash flows from investing activities of continuing operations
Change in loans	(6,480)	(17,346)
Proceeds from sales of loans	1,039	1,824
Purchases of investments	(57,643)	(94,752)
Proceeds from sales of investments	28,895	33,609
Proceeds from maturities of investments	25,602	38,472
Changes in investments and advances-intercompany	(3,293)	4,203
Other investing activities	(29,773)	(17,543)
Net cash used in investing activities of continuing operations	(41,653)	(51,533)
Cash flows from financing activities of continuing operations
Proceeds / (repayments) from issuance of long-term debt-third-party, net	(8,296)	(4,317)
Proceeds / (repayments) from issuance of long-term debt-intercompany, net	(639)	(7,812)
Change in deposits	40,076	20,908
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	2,478	(426)
Net change in short-term borrowings and other advances-intercompany	2,782	40,289
Capital contributions from parent		525
Other financing activities	1
Net cash provided by financing activities of continuing operations	36,402	49,167
Effect of exchange rate changes on cash and due from banks	397	331
Change in cash and due from banks	(2,996)	(840)
Cash and due from banks at beginning of period	24,069	22,343
Cash and due from banks at end of period	21,073	21,503
Cash paid during the year for:
Income taxes	1,057	831
Interest	382	1,129
Non-cash investing activities
Transfers to repossessed assets	24	166
Transfers to trading accounting assets from investments (held-to-maturity)		12,700
Consolidating adjustments
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities of continuing operations	34	(329)
Cash flows from investing activities of continuing operations
Change in loans	(454)	(907)
Proceeds from sales of loans	(2)
Purchases of investments	155	140
Proceeds from sales of investments	(429)	(27)
Proceeds from maturities of investments	(55)	(93)
Changes in investments and advances-intercompany	109	(42)
Net cash used in investing activities of continuing operations	(676)	(929)
Cash flows from financing activities of continuing operations
Proceeds / (repayments) from issuance of long-term debt-third-party, net	(750)	153
Proceeds / (repayments) from issuance of long-term debt-intercompany, net	(921)	2,476
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	750
Net change in short-term borrowings and other advances-intercompany	1,599	(1,590)
Net cash provided by financing activities of continuing operations	678	1,039
Change in cash and due from banks	36	(219)
Cash and due from banks at beginning of period	(372)	(323)
Cash and due from banks at end of period	(336)	(542)
Cash paid during the year for:
Income taxes	(12)
Interest	(438)	(706)
Non-cash investing activities
Transfers to repossessed assets	$ (27)	$ (212)