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, 2015				$ 16,718		$ 108,319	$ 133,841		$ (7,677)		$ (29,344)	$ 1,235
Adjustment to opening balance, net of taxes at Dec. 31, 2015	[1]						15				(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	[2]
Preferred stock issuance expense						(31)
Other						(7)	0	[3]				(1)
Net income		$ 3,506					3,501					5
Common dividends	[4]						(149)
Preferred dividends		(210)					(210)
Tax benefit							0
Treasury stock acquired	[5]								(1,312)
Other comprehensive income (loss)											2,733	27
Transactions between Citigroup and the noncontrolling-interest shareholders												(27)
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
Balance, beginning of period at Dec. 31, 2016		226,143		19,253		108,073	146,477		(16,302)		(32,381)	1,023
Adjustment to opening balance, net of taxes at Dec. 31, 2016	[1]						0				0
Adjusted balance, beginning of period at Dec. 31, 2016							146,477				(32,381)
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				0
Employee benefit plans						(426)			507	[2]
Preferred stock issuance expense						0
Other						(3)	(90)	[3]				(42)
Net income		4,100					4,090					10
Common dividends	[4]						(445)
Preferred dividends		(301)					(301)
Tax benefit
Treasury stock acquired	[5]								(1,784)
Other comprehensive income (loss)											1,464	31
Transactions between Citigroup and the noncontrolling-interest shareholders												(1)
Net change in noncontrolling interests												(2)
Balance, end of period at Mar. 31, 2017		$ 229,153	$ 228,132	$ 19,253	$ 208,879	$ 107,644	$ 149,731		$ (17,579)		$ (30,917)	$ 1,021

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

[2] 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.

[3] Includes the impact of ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. See Note 1 to the Consolidated Financial Statements.

[4] Common dividends declared were $0.16 per share in the first quarter of 2017 and $0.05 per share in the first quarter of 2016.

[5] For the three months ended March 31, 2017 and 2016, primarily consists of open market purchases under Citi’s Board of Directors-approved common stock repurchase program.