CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Citigroup’s net income	$ 12,682	$ 9,228	$ 14,845
Net changes, net of taxes in Citigroup’s other comprehensive income (loss)
Unrealized gains and losses on AFS debt securities	907	2,254	(5,384)
Debt valuation adjustment (DVA)	(412)	(1,551)	2,029
Cash flow hedges	1,186	1,116	(2,623)
Benefit plans liability adjustment	423	(295)	97
Currency translation adjustments (CTA), net of hedges	(5,162)	752	(2,471)
Excluded component of fair value hedges	(12)	(48)	55
Long-duration insurance contracts	18	7	0
Citigroup’s total other comprehensive income (loss)	(3,052)	2,235	(8,297)
Total Citigroup comprehensive income	9,630	11,463	6,548
Add: Other comprehensive income (loss) attributable to noncontrolling interests	(61)	84	(58)
Add: Net income (loss) attributable to noncontrolling interests	151	153	89
Total comprehensive income	$ 9,720	$ 11,700	$ 6,579