CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - 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	[2]						(349)	[1]			0
Adjusted balance, beginning of period at Dec. 31, 2014							117,852				(23,216)
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				4,750
Employee benefit plans						325			405	[3]
Preferred stock issuance expense						(19)
Other						(24)						2
Net income		$ 13,972					13,907					65
Common dividends	[4]						(334)
Preferred dividends		(504)					(504)
Tax benefit							0
Treasury stock acquired	[5]								(3,802)
Other comprehensive income (loss)											(4,041)	(67)
Transactions between noncontrolling-interest shareholders and the related consolidated subsidiary												0
Transactions between Citigroup and the noncontrolling-interest shareholders												(144)
Dividends paid to noncontrolling-interest shareholders												(78)
Net change in noncontrolling interests												(222)
Balance, end of period at Sep. 30, 2015		222,137	$ 220,848	15,218	$ 205,630	108,292	130,921		(6,326)		(27,257)	1,289
Balance, beginning of period at Jun. 30, 2015											(25,104)
Increase (Decrease) in Stockholders' Equity
Net income		4,296
Preferred dividends		(174)
Other comprehensive income (loss)											(2,153)
Balance, end of period at Sep. 30, 2015		222,137	220,848	15,218	205,630	108,292	130,921		(6,326)		(27,257)	1,289
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	[2]						15	[1]			(15)
Adjusted balance, beginning of period at Dec. 31, 2015							133,856				(29,359)
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				2,535
Employee benefit plans						(371)			775	[3]
Preferred stock issuance expense						(37)
Other						(5)						(33)
Net income		11,387					11,339					48
Common dividends	[4]						(760)
Preferred dividends		(757)					(757)
Tax benefit							0
Treasury stock acquired	[5]								(5,167)
Other comprehensive income (loss)											2,166	(13)
Transactions between noncontrolling-interest shareholders and the related consolidated subsidiary												(11)
Transactions between Citigroup and the noncontrolling-interest shareholders												(69)
Dividends paid to noncontrolling-interest shareholders												(42)
Net change in noncontrolling interests												(120)
Balance, end of period at Sep. 30, 2016		232,690	231,575	19,253	212,322	107,906	143,678		(12,069)		(27,193)	1,115
Balance, beginning of period at Jun. 30, 2016											(26,115)
Increase (Decrease) in Stockholders' Equity
Net income		3,857
Preferred dividends		(225)
Other comprehensive income (loss)											(1,078)
Balance, end of period at Sep. 30, 2016		$ 232,690	$ 231,575	$ 19,253	$ 212,322	$ 107,906	$ 143,678		$ (12,069)		$ (27,193)	$ 1,115

[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 in Citi’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015 for additional information.

[2] See Note 1 to the Consolidated Financial Statements for additional details.

[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 and second quarters and $0.16 per share in the third quarter of 2016 and $0.01 per share in the first quarter and $0.05 per share in the second and third quarters of 2015.

[5] For the nine months ended September 30, 2016 and 2015, primarily consists of open market purchases under Citi’s Board of Directors-approved common stock repurchase program.