CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Citigroup’s net income		$ 4,306	$ 7,942
Add: Citigroup’s other comprehensive income
Net change in unrealized gains and losses on debt securities, net of taxes	[1]	(4,277)	(1,785)
Net change in debt valuation adjustment (DVA), net of taxes	[1],[2]	793	(42)
Net change in cash flow hedges, net of taxes	[1]	(1,541)	(556)
Benefit plans liability adjustment, net of taxes	[1]	171	714
Net change in foreign currency translation adjustment, net of taxes and hedges	[1]	(14)	(1,274)
Net change in excluded component of fair value hedges, net of taxes	[1]	48	(10)
Citigroup’s total other comprehensive income (loss)	[1]	(4,820)	(2,953)
Total Citigroup comprehensive income (loss)		(514)	4,989
Add: Other comprehensive loss attributable to noncontrolling interests		(29)	(58)
Add: Net income (loss) attributable to noncontrolling interests		17	33
Total comprehensive income		$ (526)	$ 4,964

[1] See Note 17.

[2] See Note 20.