CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income before attribution of noncontrolling interests		$ 3,857	$ 4,296	$ 11,387	$ 13,972
Add: Citigroup’s other comprehensive income (loss)
Net change in unrealized gains and losses on investment securities, net of taxes		(432)	511	2,529	167
Net change in debt valuation adjustment (DVA), net of taxes	[1]	(200)	0	5	0
Net change in cash flow hedges, net of taxes		(83)	189	385	367
Benefit plans liability adjustment, net of taxes		12	(360)	(480)	128
Net change in foreign currency translation adjustment, net of taxes and hedges		(375)	(2,493)	(273)	(4,703)
Citigroup’s total other comprehensive income (loss)		(1,078)	(2,153)	2,166	(4,041)
Total comprehensive income before attribution of noncontrolling interests		2,779	2,143	13,553	9,931
Less: Net income attributable to noncontrolling interests		17	5	48	65
Citigroup’s comprehensive income		$ 2,762	$ 2,138	$ 13,505	$ 9,866

[1] See Note 1 to the Consolidated Financial Statements for additional details.