CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income before attribution of noncontrolling interests	$ 4,812		$ 3,989
Add: Citigroup’s other comprehensive income (loss)
Net change in unrealized gains and losses on investment securities, net of taxes	591		428
Net change in cash flow hedges, net of taxes	86		118
Benefit plans liability adjustment, net of taxes	(90)	[1]	(33)	[1]
Net change in foreign currency translation adjustment, net of taxes and hedges	(2,062)		(526)
Citigroup’s total other comprehensive income (loss)	(1,475)		(13)
Total comprehensive income before attribution of noncontrolling interests	3,337		3,976
Less: Net income attributable to noncontrolling interests	42		45
Citigroup’s comprehensive income	$ 3,295		$ 3,931

[1] Reflects adjustments based on the actuarial valuations of the Company’s significant pension and postretirement plans, including changes in the mortality assumptions at March 31, 2015, and amortization of amounts previously recognized in Accumulated other comprehensive income (loss). See Note 8 to the Consolidated Financial Statements.