CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions		Total	Citigroup stockholders' equity	Preferred stock at aggregate liquidation value	Total Citigroup common stockholders’ equity	Common stock and additional paid-in capital (APIC)	Retained earnings	Retained earnings Cumulative Effect, Period of Adoption, Adjustment	[1]	Retained earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury stock, at cost		Citigroup's accumulated other comprehensive income (loss)	Citigroup's accumulated other comprehensive income (loss) Cumulative Effect, Period of Adoption, Adjustment	[1]	Citigroup's accumulated other comprehensive income (loss) Cumulative Effect, Period of Adoption, Adjusted Balance	Noncontrolling interests
Balance, beginning of period at Dec. 31, 2022				$ 18,995		$ 108,489	$ 194,734	$ 290		$ 195,024	$ (73,967)		$ (47,062)	$ 27		$ (47,035)	$ 649
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				1,250
Redemption of preferred stock				0
Employee benefit plans						(84)					705	[2]
Preferred stock issuance costs (reclassifications to Retained earnings for redemptions)						0
Other (primarily preferred stock issuance costs related to new issuances)						(5)	0										9
Net income before attribution of noncontrolling interests		$ 4,651					4,606										45
Common dividends	[3]						(1,000)
Preferred dividends		(277)					(277)
Treasury stock acquired	[4]										0
Transactions between Citigroup and the noncontrolling-interest shareholders																	0
Distributions paid to noncontrolling-interest shareholders																	(11)
Citigroup’s total other comprehensive income													1,594				32
Net change in noncontrolling interests																	75
Balance, end of period at Mar. 31, 2023		209,019	$ 208,295	20,245	$ 188,050	108,400	198,353				(73,262)		(45,441)				724
Balance, beginning of period at Dec. 31, 2023		206,251		17,600		108,986	198,905	$ 0		$ 198,905	(75,238)		(44,800)	$ 0		$ (44,800)	798
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				550
Redemption of preferred stock				(550)
Employee benefit plans						(372)					873	[2]
Preferred stock issuance costs (reclassifications to Retained earnings for redemptions)						11
Other (primarily preferred stock issuance costs related to new issuances)						(2)	(11)										1
Net income before attribution of noncontrolling interests		3,407					3,371										36
Common dividends	[3]						(1,030)
Preferred dividends		(279)					(279)
Treasury stock acquired	[4]										(500)
Transactions between Citigroup and the noncontrolling-interest shareholders																	(9)
Distributions paid to noncontrolling-interest shareholders																	0
Citigroup’s total other comprehensive income													(929)				(13)
Net change in noncontrolling interests																	15
Balance, end of period at Mar. 31, 2024		$ 207,398	$ 206,585	$ 17,600	$ 188,985	$ 108,623	$ 200,956				$ (74,865)		$ (45,729)				$ 813

[1] See Note 1 for additional details.

[2] Includes treasury stock related to certain activity under Citi’s employee restricted or deferred stock programs where shares are withheld to satisfy employees’ tax requirements.

[3] Common dividends declared were $0.53 per share for 1Q24 and $0.51 per share for 1Q23.

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