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, 2017				$ 19,253		$ 108,039	$ 138,425		$ (30,309)		$ (34,668)	$ 932
Adjustment to opening balance, net of taxes at Dec. 31, 2017	[1]						(84)				(3)
Adjusted balance, beginning of period at Dec. 31, 2017							138,341				(34,671)
Increase (Decrease) in Stockholders' Equity
Redemption of preferred stock				(97)
Employee benefit plans						(405)			469	[2]
Other						(4)	0	[3]				(2)
Citigroup’s net income		$ 4,642					4,620					22
Common dividends	[4]						(826)
Preferred dividends		(272)					(272)
Treasury stock acquired	[5]								(2,275)
Citigroup's total other comprehensive income (loss)											52	14
Transactions between Citigroup and the noncontrolling-interest shareholders												(15)
Distributions paid to noncontrolling-interest shareholders												0
Net change in noncontrolling interests												19
Balance, end of period at Mar. 31, 2018		202,866	$ 201,915	19,156	$ 182,759	107,630	141,863		(32,115)		(34,619)	951
Balance, beginning of period at Dec. 31, 2018		197,074		18,460		107,953	151,347		(44,370)		(37,170)	854
Adjustment to opening balance, net of taxes at Dec. 31, 2018	[1]						151				0
Adjusted balance, beginning of period at Dec. 31, 2018							151,498				(37,170)
Increase (Decrease) in Stockholders' Equity
Redemption of preferred stock				(480)
Employee benefit plans						(382)			564	[2]
Other						11	(12)	[3]				0
Citigroup’s net income		4,735					4,710					25
Common dividends	[4]						(1,075)
Preferred dividends		(262)					(262)
Treasury stock acquired	[5]								(4,055)
Citigroup's total other comprehensive income (loss)											862	(13)
Transactions between Citigroup and the noncontrolling-interest shareholders												(99)
Distributions paid to noncontrolling-interest shareholders												(4)
Net change in noncontrolling interests												(91)
Balance, end of period at Mar. 31, 2019		$ 197,015	$ 196,252	$ 17,980	$ 178,272	$ 107,582	$ 154,859		$ (47,861)		$ (36,308)	$ 763

[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 $0.45 per share in the first quarter of 2019 and $0.32 for the first quarter of 2018.

[5] rimarily consists of open market purchases under Citi’s Board of Directors-approved common stock repurchase program.