CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Citigroup’s net income		$ 3,371	$ 4,606
Add: Citigroup’s other comprehensive income, net change, net of taxes
Unrealized gains and losses on debt securities	[1],[2]	100	836
Debt valuation adjustment (DVA)	[1],[3]	(563)	(325)
Cash flow hedges	[1]	492	361
Benefit plans liability adjustment	[1],[4]	77	(104)
CTA, net of hedges	[1]	(1,054)	841
Excluded component of fair value hedges	[1]	(2)	(20)
Long-duration insurance contracts	[1]	21	5
Citigroup’s total other comprehensive income (loss)	[1]	(929)	1,594
Total Citigroup comprehensive income (loss)		2,442	6,200
Add: Other comprehensive income (loss) attributable to noncontrolling interests		(13)	32
Add: Net income (loss) attributable to noncontrolling interests		36	45
Total comprehensive income		$ 2,465	$ 6,277

[1] See Note 19.

[2] See Note 13

[3] See Note 23.

[4] See Note 8.