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				2,750
Redemption of preferred stock				(2,250)
Employee benefit plans						296					729	[3]
Other						3	(16)										8
Net income before attribution of noncontrolling interests		$ 11,189					11,067										122
Common dividends	[4]						(3,042)
Preferred dividends		(898)					(898)
Treasury stock acquired	[5]										(1,500)
Transactions between Citigroup and the noncontrolling-interest shareholders																	(14)
Distributions paid to noncontrolling-interest shareholders																	(82)
Citigroup’s total other comprehensive income													858				9
Net change in noncontrolling interests																	43
Balance, end of period at Sep. 30, 2023		210,195	$ 209,503	19,495	$ 190,008	108,788	202,135				(74,738)		(46,177)				692
Balance, beginning of period at Jun. 30, 2023				20,245		108,610	199,976			199,976	(74,247)		(45,865)			(45,865)	703
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				1,500
Redemption of preferred stock				(2,250)
Employee benefit plans						170					9	[3]
Other						8	(16)										0
Net income before attribution of noncontrolling interests		3,587					3,546										41
Common dividends	[4]						(1,038)
Preferred dividends		(333)					(333)
Treasury stock acquired	[5]										(500)
Transactions between Citigroup and the noncontrolling-interest shareholders																	(15)
Distributions paid to noncontrolling-interest shareholders																	0
Citigroup’s total other comprehensive income													(312)				(37)
Net change in noncontrolling interests																	(11)
Balance, end of period at Sep. 30, 2023		210,195	209,503	19,495	190,008	108,788	202,135				(74,738)		(46,177)				692
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				3,800
Redemption of preferred stock				(5,050)
Employee benefit plans						37					898	[3]
Other						(23)	(20)										0
Net income before attribution of noncontrolling interests		9,943					9,826										117
Common dividends	[4]						(3,143)
Preferred dividends		(798)					(798)
Treasury stock acquired	[5]										(1,500)
Transactions between Citigroup and the noncontrolling-interest shareholders																	(9)
Distributions paid to noncontrolling-interest shareholders																	(94)
Citigroup’s total other comprehensive income													(397)				7
Net change in noncontrolling interests																	21
Balance, end of period at Sep. 30, 2024		209,902	209,083	16,350	192,733	109,000	204,770				(75,840)		(45,197)				819
Balance, beginning of period at Jun. 30, 2024				18,100		108,816	202,913			$ 202,913	(74,842)		(46,677)			$ (46,677)	834
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				1,500
Redemption of preferred stock				(3,250)
Employee benefit plans						174					2	[3]
Other						10	(15)										0
Net income before attribution of noncontrolling interests		3,273					3,238										35
Common dividends	[4]						(1,089)
Preferred dividends		(277)					(277)
Treasury stock acquired	[5]										(1,000)
Transactions between Citigroup and the noncontrolling-interest shareholders																	0
Distributions paid to noncontrolling-interest shareholders																	(90)
Citigroup’s total other comprehensive income													1,480				40
Net change in noncontrolling interests																	(15)
Balance, end of period at Sep. 30, 2024		$ 209,902	$ 209,083	$ 16,350	$ 192,733	$ 109,000	$ 204,770				$ (75,840)		$ (45,197)				$ 819

[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 $0.56 for 3Q24, $0.53 per share for both 1Q24 and 2Q24, $0.53 for 3Q23 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.