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's accumulated other comprehensive income (loss)	Noncontrolling interest
Balance, beginning of year (Prior Period Adjustment)							$ 79,559
Balance, beginning of year at Dec. 31, 2010		165,789		312		101,316	79,559	(1,442)	(16,277)	2,321
Increase (Decrease) in Stockholders' Equity
Citigroup's net income (loss)		6,340					6,340
Employee benefit plans						314
ADIA Upper DECs Equity Units Purchase Contract						1,875
Common dividends	[1]						(29)
Preferred dividends		(13)					(13)
Issuance of shares pursuant to employee benefit plans								355
Initial origination of a noncontrolling interest										28
Transactions between Citigroup and the noncontrolling-interest shareholders										(261)
Net income attributable to noncontrolling interests		134								134
Other						(1)				6
Net change in accumulated other comprehensive income (loss)									4,055
Total other comprehensive income (loss) attributable to noncontrolling interests		53								53
Net change in noncontrolling interests										(40)
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 (Prior Period Adjustment)	[2]						90,413
Balance, beginning of year at Dec. 31, 2011		179,573		312		105,833	90,520	(1,071)	(17,788)	1,767
Increase (Decrease) in Stockholders' Equity
Citigroup's net income (loss)		5,877					5,877
Employee benefit plans						154
Common dividends	[1]						(61)
Preferred dividends		(13)					(13)
Issuance of shares pursuant to employee benefit plans								216
Treasury stock acquired	[3]							(4)
Initial origination of a noncontrolling interest										88
Transactions between Citigroup and the noncontrolling-interest shareholders										(29)
Net income attributable to noncontrolling interests		166								166
Dividends paid to noncontrolling-interest shareholders										(4)
Other						4				(71)
Net change in accumulated other comprehensive income (loss)									39
Total other comprehensive income (loss) attributable to noncontrolling interests		11								11
Net change in noncontrolling interests										161
Balance, end of period at Jun. 30, 2012		$ 185,839	$ 183,911	$ 312	$ 183,599	$ 105,991	$ 96,216	$ (859)	$ (17,749)	$ 1,928

[1] Common dividends declared were as follows: $0.01 per share in the first and second quarters of 2012; $0.01 in the second quarter of 2011.

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