CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Citigroup’s net income		$ 4,644	$ 3,146	$ 18,779	$ 6,738
Add: Citigroup’s other comprehensive income
Net change in unrealized gains and losses on debt securities, net of taxes	[1]	(279)	(282)	(2,538)	3,683
Net change in debt valuation adjustment (DVA), net of taxes	[1],[2]	(82)	(307)	(186)	601
Net change in cash flow hedges, net of taxes	[1]	(201)	(235)	(930)	1,736
Benefit plans liability adjustment, net of taxes	[1]	135	246	936	(117)
Net change in foreign currency translation adjustment, net of taxes and hedges	[1]	(1,312)	897	(2,063)	(2,651)
Net change in excluded component of fair value hedges, net of taxes	[1]	8	(39)	(12)	1
Citigroup’s total other comprehensive income (loss)	[1]	(1,731)	280	(4,793)	3,253
Total Citigroup comprehensive income (loss)		2,913	3,426	13,986	9,991
Add: Other comprehensive income (loss) attributable to noncontrolling interests		(31)	19	(71)	7
Add: Net income (loss) attributable to noncontrolling interests		24	24	67	18
Total comprehensive income		$ 2,906	$ 3,469	$ 13,982	$ 10,016

[1] See Note 17 to the Consolidated Financial Statements.

[2] See Note 20 to the Consolidated Financial Statements.