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, 2018				$ 18,460		$ 107,953	$ 151,347	$ (44,370)		$ (37,170)	$ 854
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				0
Adjustment to opening balance, net of taxes at Dec. 31, 2018	[1]						151
Adjusted balance, beginning of period at Dec. 31, 2018							151,498
Increase (Decrease) in Stockholders' Equity
Redemption of preferred stock				(480)
Employee benefit plans						(382)		564	[2]
Preferred stock issuance costs						0
Common dividends	[3]						(1,075)
Preferred dividends		$ (262)					(262)
Other						11	(12)				0
Treasury stock acquired	[4]							(4,055)
Citigroup's total other comprehensive income (loss)										862	(13)
Transactions between Citigroup and the noncontrolling-interest shareholders											(99)
Net income before attribution of noncontrolling interests		4,735					4,710				25
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
Balance, beginning of period at Dec. 31, 2019		193,946		17,980		107,871	165,369	(61,660)		(36,318)	704
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				1,500
Adjustment to opening balance, net of taxes at Dec. 31, 2019	[1]						(3,076)
Adjusted balance, beginning of period at Dec. 31, 2019							162,293
Increase (Decrease) in Stockholders' Equity
Redemption of preferred stock				(1,500)
Employee benefit plans						(292)		438	[2]
Preferred stock issuance costs						2
Common dividends	[3]						(1,081)
Preferred dividends		(291)					(291)
Other						0	(5)				10
Treasury stock acquired	[4]							(2,925)
Citigroup's total other comprehensive income (loss)										3,797	(51)
Transactions between Citigroup and the noncontrolling-interest shareholders											(6)
Net income before attribution of noncontrolling interests		2,516					2,522				(6)
Distributions paid to noncontrolling-interest shareholders											0
Net change in noncontrolling interests											(53)
Balance, end of period at Mar. 31, 2020		$ 192,982	$ 192,331	$ 17,980	$ 174,351	$ 107,581	$ 163,438	$ (64,147)		$ (32,521)	$ 651

[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] Common dividends declared were $0.51 per share in the first quarter of 2020 and $0.45 per share in the first quarter of 2019.

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