CONDENSED CONSOLIDATING FINANCIAL STATEMENTS OF CASH FLOWS (Details 3) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities	$ 4,845	$ 41,601
Cash flows from investing activities of continuing operations
Change in loans	(1,336)	55,314
Proceeds from sales and securitizations of loans	4,483	3,752
Purchases of investments	(171,093)	(200,847)
Proceeds from sales of investments	83,415	78,983
Proceeds from maturities of investments	87,315	95,806
Other investing activities	5,471	7,270
Net cash provided by investing activities of continuing operations	8,255	40,278
Cash flows from financing activities of continuing operations
Dividends paid	(42)
Treasury stock acquired		(5)
Proceeds/(Repayments) from issuance of long-term debt-third-party, net	(33,048)	(28,612)
Change in deposits	21,355	(21,952)
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	(6,801)	(33,227)
Other financing activities	1,652	1,151
Net cash used in financing activities of continuing operations	(16,884)	(82,645)
Effect of exchange rate changes on cash and due from banks	909	(48)
Net cash provided by (used in) discontinued operations	2,669	51
Change in cash and due from banks	(206)	(763)
Cash and due from banks at beginning of period	27,972	25,472
Cash and due from banks at end of period	27,766	24,709
Cash paid during the year for:
Income taxes	1,916	2,769
Interest	10,121	12,101
Non-cash investing activities
Transfers to OREO and other repossessed assets	751	1,498
Citigroup Parent Company
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities	1,209	3,845
Cash flows from investing activities of continuing operations
Purchases of investments	(13,820)	(2,796)
Proceeds from sales of investments	2,878	874
Proceeds from maturities of investments	15,701	5,079
Changes in investments and advances-intercompany	6,949	2,643
Business acquisitions	(10)	(20)
Net cash provided by investing activities of continuing operations	11,698	5,780
Cash flows from financing activities of continuing operations
Dividends paid	(42)
Treasury stock acquired		(5)
Proceeds/(Repayments) from issuance of long-term debt-third-party, net	(11,083)	(6,821)
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party		11
Net change in short-term borrowings and other advances-intercompany	(3,350)	(3,960)
Other financing activities	1,652	1,151
Net cash used in financing activities of continuing operations	(12,823)	(9,624)
Change in cash and due from banks	84	1
Cash and due from banks at beginning of period	11	5
Cash and due from banks at end of period	95	6
Cash paid during the year for:
Income taxes	9	(308)
Interest	4,747	4,703
Citigroup Global Markets Holdings Inc. (CGMHI)
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities	9,414	20,709
Cash flows from investing activities of continuing operations
Change in loans		32
Proceeds from sales and securitizations of loans	3	68
Purchases of investments		(4)
Proceeds from sales of investments	19	32
Changes in investments and advances-intercompany	(405)	3,475
Other investing activities	12,814	588
Net cash provided by investing activities of continuing operations	12,431	4,191
Cash flows from financing activities of continuing operations
Dividends paid-intercompany		(5,500)
Proceeds/(Repayments) from issuance of long-term debt-third-party, net	(1,225)	(2,065)
Proceeds/(Repayments) from issuance of long-term debt-intercompany, net	6,444	(3,882)
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	260	(1,205)
Net change in short-term borrowings and other advances-intercompany	(25,833)	(12,368)
Capital contributions from parent	(775)
Net cash used in financing activities of continuing operations	(21,129)	(25,020)
Change in cash and due from banks	716	(120)
Cash and due from banks at beginning of period	5,220	4,947
Cash and due from banks at end of period	5,936	4,827
Cash paid during the year for:
Income taxes	146	117
Interest	1,134	2,430
Non-cash investing activities
Transfers to OREO and other repossessed assets	39	193
Citigroup Funding Inc. (CFI)
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities	714	1,277
Cash flows from investing activities of continuing operations
Change in loans	27,657	47,497
Net cash provided by investing activities of continuing operations	27,657	47,497
Cash flows from financing activities of continuing operations
Dividends paid-intercompany		(1,500)
Proceeds/(Repayments) from issuance of long-term debt-third-party, net	(3,355)	(3,773)
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	(617)	1,734
Net change in short-term borrowings and other advances-intercompany	(24,327)	(45,235)
Net cash used in financing activities of continuing operations	(28,299)	(48,774)
Change in cash and due from banks	72
Cash and due from banks at beginning of period		1
Cash and due from banks at end of period	72	1
Cash paid during the year for:
Income taxes	(171)	259
Interest	324	642
CitiFinancial Credit Company (CCC)
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities	1,124	(3,652)
Cash flows from investing activities of continuing operations
Change in loans	1,372	7,382
Proceeds from sales and securitizations of loans	2	126
Purchases of investments	(246)	(342)
Proceeds from sales of investments	36	109
Proceeds from maturities of investments	152	143
Changes in investments and advances-intercompany	58	(138)
Net cash provided by investing activities of continuing operations	1,374	7,280
Cash flows from financing activities of continuing operations
Proceeds/(Repayments) from issuance of long-term debt-third-party, net	(654)	(530)
Proceeds/(Repayments) from issuance of long-term debt-intercompany, net	(3,900)	(8,088)
Net change in short-term borrowings and other advances-intercompany	2,243	4,993
Net cash used in financing activities of continuing operations	(2,311)	(3,625)
Change in cash and due from banks	187	3
Cash and due from banks at beginning of period	323	343
Cash and due from banks at end of period	510	346
Cash paid during the year for:
Income taxes	2	(142)
Interest	906	1,145
Non-cash investing activities
Transfers to OREO and other repossessed assets	370	683
Associates
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities	297	(3,356)
Cash flows from investing activities of continuing operations
Change in loans	1,966	8,040
Proceeds from sales and securitizations of loans		126
Purchases of investments	(246)	(348)
Proceeds from sales of investments	36	220
Proceeds from maturities of investments	152	152
Changes in investments and advances-intercompany	(2,566)	(731)
Net cash provided by investing activities of continuing operations	(658)	7,459
Cash flows from financing activities of continuing operations
Proceeds/(Repayments) from issuance of long-term debt-third-party, net	(140)	(1,752)
Proceeds/(Repayments) from issuance of long-term debt-intercompany, net	(900)	(2,279)
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	13	277
Net change in short-term borrowings and other advances-intercompany	1,634	(377)
Net cash used in financing activities of continuing operations	607	(4,131)
Change in cash and due from banks	246	(28)
Cash and due from banks at beginning of period	398	464
Cash and due from banks at end of period	644	436
Cash paid during the year for:
Income taxes	72	181
Interest	810	781
Non-cash investing activities
Transfers to OREO and other repossessed assets	397	714
Other Citigroup Subsidiaries, eliminations
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities	(6,789)	19,126
Cash flows from investing activities of continuing operations
Change in loans	(30,959)	(255)
Proceeds from sales and securitizations of loans	4,480	3,558
Purchases of investments	(157,027)	(197,699)
Proceeds from sales of investments	80,482	77,857
Proceeds from maturities of investments	71,462	90,575
Changes in investments and advances-intercompany	(3,978)	(5,387)
Business acquisitions	10	20
Other investing activities	(7,343)	6,682
Net cash provided by investing activities of continuing operations	(42,873)	(24,649)
Cash flows from financing activities of continuing operations
Dividends paid-intercompany		7,000
Proceeds/(Repayments) from issuance of long-term debt-third-party, net	(17,245)	(14,201)
Proceeds/(Repayments) from issuance of long-term debt-intercompany, net	(5,544)	6,161
Change in deposits	21,355	(21,952)
Net change in short-term borrowings and other investment banking and brokerage borrowings-third-party	(6,457)	(34,044)
Net change in short-term borrowings and other advances-intercompany	51,876	61,940
Capital contributions from parent	775
Net cash used in financing activities of continuing operations	44,760	4,904
Effect of exchange rate changes on cash and due from banks	909	(48)
Net cash provided by (used in) discontinued operations	2,669	51
Change in cash and due from banks	(1,324)	(616)
Cash and due from banks at beginning of period	22,343	20,055
Cash and due from banks at end of period	21,019	19,439
Cash paid during the year for:
Income taxes	1,860	2,520
Interest	3,106	3,545
Non-cash investing activities
Transfers to OREO and other repossessed assets	315	591
Consolidating adjustments
Condensed Consolidating Statements of Cash Flows:
Net cash provided by (used in) operating activities	(1,124)	3,652
Cash flows from investing activities of continuing operations
Change in loans	(1,372)	(7,382)
Proceeds from sales and securitizations of loans	(2)	(126)
Purchases of investments	246	342
Proceeds from sales of investments	(36)	(109)
Proceeds from maturities of investments	(152)	(143)
Changes in investments and advances-intercompany	(58)	138
Net cash provided by investing activities of continuing operations	(1,374)	(7,280)
Cash flows from financing activities of continuing operations
Proceeds/(Repayments) from issuance of long-term debt-third-party, net	654	530
Proceeds/(Repayments) from issuance of long-term debt-intercompany, net	3,900	8,088
Net change in short-term borrowings and other advances-intercompany	(2,243)	(4,993)
Net cash used in financing activities of continuing operations	2,311	3,625
Change in cash and due from banks	(187)	(3)
Cash and due from banks at beginning of period	(323)	(343)
Cash and due from banks at end of period	(510)	(346)
Cash paid during the year for:
Income taxes	(2)	142
Interest	(906)	(1,145)
Non-cash investing activities
Transfers to OREO and other repossessed assets	$ (370)	$ (683)