CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Citigroup’s net income	$ 3,752	$ 3,238	$ 11,835	$ 9,826
Net changes, net of taxes in Citigroup’s other comprehensive income (loss)
Unrealized gains and losses on AFS debt securities	450	1,335	1,243	1,397
Debt valuation adjustment (DVA)	(1,021)	(150)	(584)	(457)
Cash flow hedges	25	(144)	104	633
Benefit plans liability adjustment	26	49	(37)	305
Currency translation adjustments (CTA), net of hedges	135	416	2,950	(2,272)
Excluded component of fair value hedges	11	(9)	18	(8)
Long-duration insurance contracts	(10)	(17)	(12)	5
Citigroup’s total other comprehensive income (loss)	(384)	1,480	3,682	(397)
Citigroup’s total comprehensive income	3,368	4,718	15,517	9,429
Add: Other comprehensive income (loss) attributable to noncontrolling interests	5	40	112	7
Add: Net income (loss) attributable to noncontrolling interests	38	35	95	117
Total comprehensive income	$ 3,411	$ 4,793	$ 15,724	$ 9,553