CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME
Net income before attribution of noncontrolling interests	$ 3,898		$ 3,057
Citigroup's other comprehensive income (loss)
Net change in unrealized gains and losses on investment securities, net of taxes	169		(774)
Net change in cash flow hedges, net of taxes	125		220
Net change in foreign currency translation adjustment, net of taxes and hedges	(711)		1,697
Pension liability adjustment, net of taxes	254	[1]	(90)	[1]
Citigroup's total other comprehensive income (loss)	(163)		1,053
Other comprehensive income (loss) attributable to noncontrolling interests
Net change in unrealized gains and losses on investment securities, net of taxes	(16)		9
Net change in foreign currency translation adjustment, net of taxes	(35)		55
Total other comprehensive income (loss) attributable to noncontrolling interests	(51)		64
Total comprehensive income before attribution of noncontrolling interests	3,684		4,174
Total comprehensive income attributable to noncontrolling interests	39		190
Citigroup's comprehensive income	$ 3,645		$ 3,984

[1] Primarily reflects adjustments based on the year-end actuarial valuations of the Company's pension and postretirement plans and amortization of amounts previously recognized in Other comprehensive income.