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		Citigroup's accumulated other comprehensive income (loss)	Noncontrolling interests
Balance, beginning of period at Dec. 31, 2014				$ 10,468		$ 108,010	$ 118,201		$ (2,929)		$ (23,216)	$ 1,511
Adjustment to opening balance, net of taxes at Dec. 31, 2014							(349)	[1],[2]			0
Adjusted balance, beginning of period at Dec. 31, 2014							117,852				(23,216)
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				1,500
Employee benefit plans						176			(49)	[3]
Preferred stock issuance expense						(6)
Other						(25)						27
Net income attributable to noncontrolling-interest shareholders		$ 4,812					4,770					42
Common dividends	[4]						(31)
Preferred dividends		(128)					(128)
Treasury stock acquired	[5]								(297)
Other comprehensive income (loss)											(1,475)	(56)
Transactions between Citigroup and the noncontrolling-interest shareholders												(118)
Dividends paid to noncontrolling-interest shareholders												(3)
Net change in noncontrolling interests												(108)
Balance, end of period at Mar. 31, 2015		216,023	$ 214,620	11,968	$ 202,652	108,155	122,463		(3,275)		(24,691)	1,403
Balance, beginning of period at Dec. 31, 2015		223,092		16,718		108,319	133,841		(7,677)		(29,344)	1,235
Adjustment to opening balance, net of taxes at Dec. 31, 2015							15	[1],[2]			(15)
Adjusted balance, beginning of period at Dec. 31, 2015							133,856				(29,359)
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				1,035
Employee benefit plans						(660)			765	[3]
Preferred stock issuance expense						(31)
Other						(7)						(1)
Net income attributable to noncontrolling-interest shareholders		3,506					3,501					5
Common dividends	[4]						(149)
Preferred dividends		(210)					(210)
Treasury stock acquired	[5]								(1,312)
Other comprehensive income (loss)											2,733	27
Transactions between Citigroup and the noncontrolling-interest shareholders												(27)
Dividends paid to noncontrolling-interest shareholders												0
Net change in noncontrolling interests												4
Balance, end of period at Mar. 31, 2016		$ 228,761	$ 227,522	$ 17,753	$ 209,769	$ 107,621	$ 136,998		$ (8,224)		$ (26,626)	$ 1,239

[1] Citi adopted ASU 2014-01 Investments-Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Affordable Housing, in the first quarter of 2015 on a retrospective basis. This adjustment to opening Retained earnings represents the impact to periods prior to January 1, 2013 and is shown as an adjustment to the opening balance since 2015 is the earliest period presented in this statement. See Note 1 to the Consolidated Financial Statements for additional information.

[2] Effective January 1, 2016, Citigroup early adopted the provisions of the amendment in ASU No. 2016-01, Financial Instruments—Overall (Subtopic 825-01): Recognition and Measurement of Financial Assets and Financial Liabilities, related to the presentation of DVA on fair value option liabilities. Accordingly, beginning in the first quarter 2016, the portion of the change in fair value of these liabilities related to changes in Citigroup’s own credit spreads (DVA) is reflected as a component of Accumulated other comprehensive income (AOCI). The cumulative effect of this change in accounting resulted in a reclassification from Retained earnings to AOCI of an accumulated after-tax loss of approximately $15 million at January 1, 2016.

[3] Includes treasury stock related to (i) certain activity on employee stock option program exercises where the employee delivers existing shares to cover the option exercise, or (ii) under Citi’s employee restricted or deferred stock programs where shares are withheld to satisfy tax requirements.

[4] Common dividends declared were $0.05 per share in the first quarter of 2016 and $0.01 per share in the first quarter of 2015.

[5] For the three months ended March 31, 2016 and 2015, primarily consists of open market purchases under Citi’s Board of Directors-approved common stock repurchase program.