CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Citigroup’s net income	$ 4,064	$ 3,371
Add: Citigroup’s other comprehensive income, net change, net of taxes
Unrealized gains and losses on AFS debt securities	515	100
Debt valuation adjustment (DVA)	779	(563)
Cash flow hedges	7	492
Benefit plans liability adjustment	(26)	77
Currency translation adjustments (CTA), net of hedges	849	(1,054)
Excluded component of fair value hedges	7	(2)
Long-duration insurance contracts	(1)	21
Citigroup’s total other comprehensive income (loss)	2,130	(929)
Citigroup’s total comprehensive income	6,194	2,442
Add: Other comprehensive income (loss) attributable to noncontrolling interests	49	(13)
Add: Net income (loss) attributable to noncontrolling interests	43	36
Total comprehensive income	$ 6,286	$ 2,465