CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Millions		Total	Citigroup stockholders' equity	Preferred stock at aggregate liquidation value	Citigroup common stockholders' equity	Common stock and additional paid-in capital	Retained earnings	Treasury stock, at cost	Accumulated other comprehensive income (loss)	Noncontrolling interest	Comprehensive income (loss)
Balance, beginning of year at Dec. 31, 2009				$ 312					$ (18,937)
Increase (Decrease) in Stockholders' Equity
Net change in cash flow hedges, net of taxes									223
Accumulated other comprehensive income-net change in foreign currency translation adjustment, net of tax									(279)
Pension liability adjustment, net of taxes									(48)
Net change in Accumulated other comprehensive income (loss) before attribution of noncontrolling interest									1,078
Balance, end of period at Mar. 31, 2010
Balance, beginning of year at Dec. 31, 2009				312		98,428	68,998	(4,543)	(18,937)	2,273
Balance as Previously Reported at Dec. 31, 2009							77,440
Increase (Decrease) in Stockholders' Equity
Adjustment to opening balance, net of taxes	[1]						(8,442)
Citigroup's net income		7,185					7,125			60	7,185
Employee benefit plans						(913)
Conversion of ADIA Upper Decs Equity Units Purchase Contract to common stock						1,875
Common dividends	[2]						7
Issuance of shares pursuant to employee benefit plans								2,774
Treasury stock acquired	[3]							(5)
Accumulated other comprehensive income-net change in unrealized gains and losses on investment securities, net of tax									2,088	6
Net change in cash flow hedges, net of taxes									(2)
Accumulated other comprehensive income-net change in foreign currency translation adjustment, net of tax									(2,315)	(105)
Pension liability adjustment, net of taxes	[4]								(4)
Initial origination of a noncontrolling interest										286
Transactions between noncontrolling-interest shareholders and the related consolidated subsidiary										(26)
Net income attributable to noncontrolling-interest shareholders		(60)								60
Dividends paid to noncontrolling-interest shareholders										(54)
Other						(84)		2		84
Net change in Accumulated other comprehensive income (loss) before attribution of noncontrolling interest									(233)		(332)
Net change in noncontrolling interests										251
Total comprehensive income before attribution of noncontrolling interest											6,853
Comprehensive income (loss) attributable to the noncontrolling interests											(39)
Comprehensive income attributable to Citigroup											6,892
Balance, end of period at Jun. 30, 2010		157,330	154,806	312	154,494	99,306	76,130	(1,772)	(19,170)	2,524
Balance, beginning of year at Mar. 31, 2010
Increase (Decrease) in Stockholders' Equity
Citigroup's net income		2,725
Net change in cash flow hedges, net of taxes									(225)
Accumulated other comprehensive income-net change in foreign currency translation adjustment, net of tax									(2,036)
Pension liability adjustment, net of taxes									44
Net income attributable to noncontrolling-interest shareholders		(28)
Net change in Accumulated other comprehensive income (loss) before attribution of noncontrolling interest									(1,311)
Balance, end of period at Jun. 30, 2010		157,330	154,806	312	154,494				(19,170)
Balance, beginning of year at Dec. 31, 2010				312					(16,277)
Increase (Decrease) in Stockholders' Equity
Net change in cash flow hedges, net of taxes									152
Accumulated other comprehensive income-net change in foreign currency translation adjustment, net of tax									1,364
Pension liability adjustment, net of taxes									37
Net change in Accumulated other comprehensive income (loss) before attribution of noncontrolling interest									2,293
Balance, end of period at Mar. 31, 2011
Balance, beginning of year at Dec. 31, 2010		165,789		312		101,316	79,559	(1,442)	(16,277)	2,321
Balance as Previously Reported at Dec. 31, 2010							79,559
Increase (Decrease) in Stockholders' Equity
Citigroup's net income		6,474					6,340			134	6,474
Employee benefit plans						314
Conversion of ADIA Upper Decs Equity Units Purchase Contract to common stock						1,875
Common dividends	[2]						(29)
Preferred dividends							(13)
Issuance of shares pursuant to employee benefit plans								355
Accumulated other comprehensive income-net change in unrealized gains and losses on investment securities, net of tax									1,792	3
Net change in cash flow hedges, net of taxes									83
Accumulated other comprehensive income-net change in foreign currency translation adjustment, net of tax									2,140	50
Pension liability adjustment, net of taxes	[4]								40
Initial origination of a noncontrolling interest										28
Transactions between Citigroup and the noncontrolling-interest shareholders										(261)
Net income attributable to noncontrolling-interest shareholders		(134)								134
Other						(1)				6
Net change in Accumulated other comprehensive income (loss) before attribution of noncontrolling interest									4,055		4,108
Net change in noncontrolling interests										(40)
Total comprehensive income before attribution of noncontrolling interest											10,582
Comprehensive income (loss) attributable to the noncontrolling interests											187
Comprehensive income attributable to Citigroup											10,395
Balance, end of period at Jun. 30, 2011		178,645	176,364	312	176,052	103,504	85,857	(1,087)	(12,222)	2,281
Balance, beginning of year at Mar. 31, 2011
Increase (Decrease) in Stockholders' Equity
Citigroup's net income		3,403
Net change in cash flow hedges, net of taxes									(69)
Accumulated other comprehensive income-net change in foreign currency translation adjustment, net of tax									776
Pension liability adjustment, net of taxes									3
Net income attributable to noncontrolling-interest shareholders		(62)
Net change in Accumulated other comprehensive income (loss) before attribution of noncontrolling interest									1,762
Balance, end of period at Jun. 30, 2011		$ 178,645	$ 176,364	$ 312	$ 176,052				$ (12,222)

[1] The adjustment to the opening balance for Retained earnings in 2010 represents the cumulative effect of initially adopting ASC 810, Consolidation (SFAS 167).

[2] Common dividends in 2010 represent a reversal of dividends accrued on forfeitures of previously issued but unvested employee stock awards related to employees who have left Citigroup.

[3] All open market repurchases were transacted under an existing authorized share repurchase plan and relate to customer fails/errors.

[4] Reflects adjustments to the funded status of pension and postretirement plans, which is the difference between the fair value of the plan assets and the projected benefit obligation. See Note 8 to the Consolidated Financial Statements.