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		Citigroup's accumulated other comprehensive income (loss) Cumulative Effect, Period of Adoption, Adjusted Balance	Noncontrolling interests
Balance, beginning of period at Dec. 31, 2021				$ 18,995		$ 108,034	$ 184,948	$ 0		$ 184,948	$ (71,240)		$ (38,765)	$ 0		$ (38,765)	$ 700
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				0
Employee benefit plans						206					502	[2]
Other						1	1										1
Net income before attribution of noncontrolling interests		$ 8,891					8,853										38
Common dividends	[3]						(2,024)
Preferred dividends		(517)					(517)
Treasury stock acquired	[4]										(3,250)
Transactions between Citigroup and noncontrolling-interest shareholders																	(34)
Distributions paid to noncontrolling-interest shareholders																	(11)
Citigroup’s total other comprehensive income													(6,730)				(82)
Net change in noncontrolling interests																	(88)
Balance, end of period at Jun. 30, 2022		199,626	$ 199,014	18,995	$ 180,019	108,241	191,261				(73,988)		(45,495)				612
Balance, beginning of period at Mar. 31, 2022				18,995		108,081	187,962	0		187,962	(73,744)		(43,585)	0	[1]	(43,585)	644
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				0
Employee benefit plans						160					6	[2]
Other						0	0										2
Net income before attribution of noncontrolling interests		4,568					4,547										21
Common dividends	[3]						(1,010)
Preferred dividends		(238)					(238)
Treasury stock acquired	[4]										(250)
Transactions between Citigroup and noncontrolling-interest shareholders																	(1)
Distributions paid to noncontrolling-interest shareholders																	(1)
Citigroup’s total other comprehensive income													(1,910)				(53)
Net change in noncontrolling interests																	(32)
Balance, end of period at Jun. 30, 2022		199,626	199,014	18,995	180,019	108,241	191,261				(73,988)		(45,495)				612
Balance, beginning of period at Dec. 31, 2022		201,838		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
Employee benefit plans						126					720	[2]
Other						(5)	0										8
Net income before attribution of noncontrolling interests		7,602					7,521										81
Common dividends	[3]						(2,004)
Preferred dividends		(565)					(565)
Treasury stock acquired	[4]										(1,000)
Transactions between Citigroup and 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	$ 0		$ 198,353	(73,262)		(45,441)	$ 0	[1]	$ (45,441)	724
Increase (Decrease) in Stockholders' Equity
Issuance of new preferred stock				0
Employee benefit plans						210					15	[2]
Other						0	0										(1)
Net income before attribution of noncontrolling interests		2,951					2,915										36
Common dividends	[3]						(1,004)
Preferred dividends		(288)					(288)
Treasury stock acquired	[4]										(1,000)
Transactions between Citigroup and 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

[1] See Note 1 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 for each of the first and second quarters of 2023 and 2022.

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