CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income before attribution of noncontrolling interests		$ 3,506	$ 4,812
Add: Citigroup’s other comprehensive income (loss)
Net change in unrealized gains and losses on investment securities, net of taxes		2,034	591
Net change in debt valuation adjustment (DVA), net of taxes	[1]	193	0
Net change in cash flow hedges, net of taxes		317	86
Benefit plans liability adjustment, net of taxes		(465)	(90)
Net change in foreign currency translation adjustment, net of taxes and hedges		654	(2,062)
Citigroup’s total other comprehensive income (loss)		2,733	(1,475)
Total comprehensive income before attribution of noncontrolling interests		6,239	3,337
Less: Net income attributable to noncontrolling interests		5	42
Citigroup’s comprehensive income		$ 6,234	$ 3,295

[1] Effective January 1, 2016, Citigroup early adopted only the provisions of the amendment in ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-01): Recognition and Measurement of Financial Assets and Financial Liabilities, related to the presentation of DVA on fair value option liabilities. Accordingly, beginning in the first quarter 2016, the portion of the change in fair value of these liabilities related to changes in Citigroup’s own credit spreads (DVA) is reflected as a component of Accumulated other comprehensive income (AOCI).