CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Citigroup’s net income		$ 4,799	$ 4,490	$ 9,509	$ 9,110
Add: Citigroup's other comprehensive income
Net change in unrealized gains and losses on debt securities, net of taxes	[1]	703	(498)	1,838	(1,556)
Net change in debt valuation adjustment (DVA), net of taxes	[1]	3	318	(568)	446
Net change in cash flow hedges, net of taxes		517	(101)	803	(323)
Benefit plans liability adjustment, net of taxes		(253)	301	(317)	389
Net change in foreign currency translation adjustment, net of taxes and hedges		91	(2,867)	149	(1,747)
Net change in excluded component of fair value hedges, net of taxes		44	(28)	62	(32)
Citigroup’s total other comprehensive income		1,105	(2,875)	1,967	(2,823)
Citigroup’s total comprehensive income		5,904	1,615	11,476	6,287
Add: Other comprehensive income (loss) attributable to noncontrolling interests		20	(57)	7	(43)
Add: Net income attributable to noncontrolling interests		10	26	35	48
Total comprehensive income		$ 5,934	$ 1,584	$ 11,518	$ 6,292

[1] See Note 1 to the Consolidated Financial Statements in Citi’s 2018 Annual Report on Form 10-K.