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	[2]	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						126					720	[3]
Other						(5)	0										8
Net income before attribution of noncontrolling interests		$ 7,602					7,521										81
Common dividends	[4]						(2,004)
Preferred dividends		(565)					(565)
Treasury stock acquired	[5]										(1,000)
Transactions between Citigroup and the noncontrolling-interest shareholders																	1
Distributions paid to noncontrolling-interest shareholders																	(82)
Citigroup’s total other comprehensive income													1,170				46
Net change in noncontrolling interests																	54
Balance, end of period at Jun. 30, 2023		209,422	$ 208,719	20,245	$ 188,474	108,610	199,976				(74,247)		(45,865)				703
Balance, beginning of period at Mar. 31, 2023				20,245		108,400	198,353			198,353	(73,262)		(45,441)			(45,441)	724
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				0
Redemption of preferred stock				0
Employee benefit plans						210					15	[3]
Other						0	0										(1)
Net income before attribution of noncontrolling interests		2,951					2,915										36
Common dividends	[4]						(1,004)
Preferred dividends		(288)					(288)
Treasury stock acquired	[5]										(1,000)
Transactions between Citigroup and the noncontrolling-interest shareholders																	1
Distributions paid to noncontrolling-interest shareholders																	(71)
Citigroup’s total other comprehensive income													(424)				14
Net change in noncontrolling interests																	(21)
Balance, end of period at Jun. 30, 2023		209,422	208,719	20,245	188,474	108,610	199,976				(74,247)		(45,865)				703
Balance, beginning of period at Dec. 31, 2023		206,251		17,600		108,986	198,905			198,905	(75,238)		(44,800)			(44,800)	798
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				2,300
Redemption of preferred stock				(1,800)
Employee benefit plans						(137)					896	[3]
Other						(33)	(5)										0
Net income before attribution of noncontrolling interests		6,670					6,588										82
Common dividends	[4]						(2,054)
Preferred dividends		(521)					(521)
Treasury stock acquired	[5]										(500)
Transactions between Citigroup and the noncontrolling-interest shareholders																	(9)
Distributions paid to noncontrolling-interest shareholders																	(4)
Citigroup’s total other comprehensive income													(1,877)				(33)
Net change in noncontrolling interests																	36
Balance, end of period at Jun. 30, 2024		209,144	208,310	18,100	190,210	108,816	202,913				(74,842)		(46,677)				834
Balance, beginning of period at Mar. 31, 2024				17,600		108,623	200,956			$ 200,956	(74,865)		(45,729)			$ (45,729)	813
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				1,750
Redemption of preferred stock				(1,250)
Employee benefit plans						235					23	[3]
Other						(42)	6										(1)
Net income before attribution of noncontrolling interests		3,263					3,217										46
Common dividends	[4]						(1,024)
Preferred dividends		(242)					(242)
Treasury stock acquired	[5]										0
Transactions between Citigroup and the noncontrolling-interest shareholders																	0
Distributions paid to noncontrolling-interest shareholders																	(4)
Citigroup’s total other comprehensive income													(948)				(20)
Net change in noncontrolling interests																	21
Balance, end of period at Jun. 30, 2024		$ 209,144	$ 208,310	$ 18,100	$ 190,210	$ 108,816	$ 202,913				$ (74,842)		$ (46,677)				$ 834

[1] See “Accounting Changes” in Note 1 to the Consolidated Financial Statements in Citi’s 2023 Form 10-K.

[2] See Note 1 to the Consolidated Financial Statements in Citi’s 2023 Form 10-K.

[3] 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.

[4] Common dividends declared were $0.53 per share for both 1Q24 and 2Q24, and $0.51 per share for both 1Q23 and 2Q23.

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