CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Millions, unless otherwise specified		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	Citigroup accumulated other comprehensive income (loss)	Noncontrolling interest
Balance, beginning of year at Dec. 31, 2010 (Previously Reported)							$ 79,559
Balance, beginning of year at Dec. 31, 2010				312		101,316	79,559	(1,442)	(16,277)	2,321
Increase (Decrease) in Stockholders' Equity
Citigroup's net income (loss)		3,071					2,999
Employee benefit plans						(157)
ADIA Upper DECs Equity Units Purchase Contract						1,875
Preferred dividends		(4)					(4)
Issuance of shares pursuant to employee benefit plans								564
Accumulated other comprehensive income-net change in unrealized gains and losses on investment securities, net of tax									740	(2)
Net change in cash flow hedges, net of taxes									152
Accumulated other comprehensive income (loss)-net change in foreign currency translation adjustment, net of tax									1,364	31
Pension liability adjustment, net of taxes	[1]								37
Transactions between Citigroup and the noncontrolling-interest shareholders										(92)
Net income attributable to noncontrolling interests		72								72
Other						(1)				26
Accumulated other comprehensive income (loss)									2,293
Net change in noncontrolling interests										35
Balance, end of period at Mar. 31, 2011		173,393	171,037	312	170,725	103,033	82,554	(878)	(13,984)	2,356
Balance, beginning of year at Dec. 31, 2011 (Previously Reported)							90,520
Balance, beginning of year (Scenario, Adjustment)	[2]						(107)
Balance, beginning of year at Dec. 31, 2011		179,573	177,806	312	177,494	105,833	90,413	(1,071)	(17,788)	1,767
Increase (Decrease) in Stockholders' Equity
Citigroup's net income (loss)		3,057					2,931
Employee benefit plans						(19)
Common dividends	[3]						(30)
Preferred dividends		(4)					(4)
Issuance of shares pursuant to employee benefit plans								192
Treasury stock acquired	[4]							(4)
Accumulated other comprehensive income-net change in unrealized gains and losses on investment securities, net of tax									(774)	9
Net change in cash flow hedges, net of taxes									220
Accumulated other comprehensive income (loss)-net change in foreign currency translation adjustment, net of tax									1,697	55
Pension liability adjustment, net of taxes	[1]								(90)
Transactions between Citigroup and the noncontrolling-interest shareholders										(53)
Net income attributable to noncontrolling interests		126								126
Dividends paid to noncontrolling-interest shareholders										(4)
Other						2				3
Accumulated other comprehensive income (loss)									1,053
Net change in noncontrolling interests										136
Balance, end of period at Mar. 31, 2012		$ 183,723	$ 181,820	$ 312	$ 181,508	$ 105,816	$ 93,310	$ (883)	$ (16,735)	$ 1,903

[1] 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.

[2] The adjustment to the opening balance for Retained earnings in 2012 represents the cumulative effect of adopting ASU 2010-26, Financial Services - Insurance (Topic 944): Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts. See Note 1 to the Consolidated Financial Statements.

[3] Common dividends declared were $0.01 per share in the first quarter of 2012.

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