CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Citigroup’s net income		$ 3,872	$ 3,998	$ 7,962	$ 7,499
Add: Citigroup's other comprehensive income
Net change in unrealized gains and losses on investment securities, net of taxes	[1]	(27)	927	193	2,961
Net change in debt valuation adjustment (DVA), net of taxes	[1]	(84)	12	(144)	205
Net change in cash flow hedges, net of taxes		117	151	115	468
Benefit plans liability adjustment, net of taxes		(135)	(27)	(147)	(492)
Net change in foreign currency translation adjustment, net of taxes and hedges		643	(552)	1,961	102
Citigroup’s total other comprehensive income		514	511	1,978	3,244
Citigroup’s total comprehensive income		4,386	4,509	9,940	10,743
Add: Other comprehensive income attributable to noncontrolling interests		39	(50)	70	(23)
Add: Net income attributable to noncontrolling interests		32	26	42	31
Total comprehensive income		$ 4,457	$ 4,485	$ 10,052	$ 10,751

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