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							(84)	[1]			(3)
Adjusted balance, beginning of period at Dec. 31, 2017							138,341				(34,671)
Increase (Decrease) in Stockholders' Equity
Redemption of preferred stock				(218)
Employee benefit plans						(285)			471	[2]
Other						1	0	[3]				(11)
Citigroup’s net income		$ 9,158					9,110					48
Common dividends	[4]						(1,650)
Preferred dividends		(590)					(590)
Treasury stock acquired	[5]								(4,575)
Citigroup's total other comprehensive income (loss)											(2,823)	(43)
Transactions between Citigroup and the noncontrolling-interest shareholders												(16)
Distributions paid to noncontrolling-interest shareholders												(36)
Net change in noncontrolling interests												(58)
Balance, end of period at Jun. 30, 2018		200,968	$ 200,094	19,035	$ 181,059	107,755	145,211		(34,413)		(37,494)	874
Balance, beginning of period at Mar. 31, 2018				19,156		107,630	141,863		(32,115)		(34,619)	951
Adjustment to opening balance, net of taxes at Mar. 31, 2018							0	[1]			0
Adjusted balance, beginning of period at Mar. 31, 2018							141,863				(34,619)
Increase (Decrease) in Stockholders' Equity
Redemption of preferred stock				(121)
Employee benefit plans						120			2	[2]
Other						5	0	[3]				(9)
Citigroup’s net income		4,516					4,490					26
Common dividends	[4]						(824)
Preferred dividends		(318)					(318)
Treasury stock acquired	[5]								(2,300)
Citigroup's total other comprehensive income (loss)											(2,875)	(57)
Transactions between Citigroup and the noncontrolling-interest shareholders												(1)
Distributions paid to noncontrolling-interest shareholders												(36)
Net change in noncontrolling interests												(77)
Balance, end of period at Jun. 30, 2018		200,968	200,094	19,035	181,059	107,755	145,211		(34,413)		(37,494)	874
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							151	[1]			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						(270)			573	[2]
Other						5	(12)	[3]				(9)
Citigroup’s net income		9,544					9,509					35
Common dividends	[4]						(2,116)
Preferred dividends		(558)					(558)
Treasury stock acquired	[5]								(7,630)
Citigroup's total other comprehensive income (loss)											1,967	7
Transactions between Citigroup and the noncontrolling-interest shareholders												(99)
Distributions paid to noncontrolling-interest shareholders												(37)
Net change in noncontrolling interests												(103)
Balance, end of period at Jun. 30, 2019		198,110	197,359	17,980	179,379	107,688	158,321		(51,427)		(35,203)	751
Balance, beginning of period at Mar. 31, 2019				17,980		107,582	154,859		(47,861)		(36,308)	763
Adjustment to opening balance, net of taxes at Mar. 31, 2019							0	[1]			0
Adjusted balance, beginning of period at Mar. 31, 2019							154,859				(36,308)
Increase (Decrease) in Stockholders' Equity
Redemption of preferred stock				0
Employee benefit plans						112			9	[2]
Other						(6)	0	[3]				(9)
Citigroup’s net income		4,809					4,799					10
Common dividends	[4]						(1,041)
Preferred dividends		(296)					(296)
Treasury stock acquired	[5]								(3,575)
Citigroup's total other comprehensive income (loss)											1,105	20
Transactions between Citigroup and the noncontrolling-interest shareholders												0
Distributions paid to noncontrolling-interest shareholders												(33)
Net change in noncontrolling interests												(12)
Balance, end of period at Jun. 30, 2019		$ 198,110	$ 197,359	$ 17,980	$ 179,379	$ 107,688	$ 158,321		$ (51,427)		$ (35,203)	$ 751

[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 and second quarters of 2019 and $0.32 for the first and second quarters of 2018.

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