CONSOLIDATED BALANCE SHEET (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Cash and due from banks (including segregated cash and other deposits)	$ 31,150	$ 36,453
Deposits with banks	143,227	102,134
Federal funds sold and securities borrowed or purchased under agreements to resell (including $167,748 and $160,589 as of March 31, 2013 and December 31, 2012, respectively, at fair value)	270,426	261,311
Brokerage receivables	25,235	22,490
Trading account assets	308,321	320,929
Investments	304,859	312,326
Loans, net of unearned income
Loans, net of unearned income	646,364	655,464
Allowance for loan losses	(23,727)	(25,455)
Total loans, net	622,637	630,009
Goodwill	25,474	25,673
Intangible assets (other than MSRs)	5,457	5,697
Mortgage servicing rights (MSRs)	2,203	1,942
Other assets	142,736	145,660
Assets of discontinued operations held for sale	9	36
Total assets	1,881,734	1,864,660
Liabilities
Non-interest-bearing deposits in U.S. offices	124,487	129,657
Interest-bearing deposits in U.S. offices (including $889 and $889 as of March 31, 2013 and December 31, 2012, respectively, at fair value)	260,221	247,716
Non-interest-bearing deposits in offices outside the U.S.	65,542	65,024
Interest-bearing deposits in offices outside the U.S. (including $667 and $558 as of March 31, 2013 and December 31, 2012, respectively, at fair value)	483,512	488,163
Total deposits	933,762	930,560
Federal funds purchased and securities loaned or sold under agreements to repurchase (including $124,854 and $116,689 as of March 31, 2013 and December 31, 2012, respectively, at fair value)	222,053	211,236
Brokerage payables	59,299	57,013
Trading account liabilities	120,226	115,549
Short-term borrowings	48,193	52,027
Long-term debt	234,326	239,463
Other liabilities	68,536	67,815
Liabilities of discontinued operations held for sale	0
Total liabilities	1,686,395	1,673,663
Stockholders' equity
Preferred stock ($1.00 par value; authorized shares: 30 million), issued shares: 125,038 as of March 31, 2013 and 102,038 as of December 31, 2012, at aggregate liquidation value	3,137	2,562
Common stock ($0.01 par value; authorized shares: 6 billion), issued shares: 3,062,087,203 as of March 31, 2013 and 3,043,153,204 as of December 31, 2012	31	30
Additional paid-in capital	106,661	106,391
Retained earnings	101,580	97,809
Treasury stock, at cost: March 31, 2013-19,202,603 shares and December 31, 2012-14,269,301 shares	(991)	(847)
Accumulated other comprehensive income (loss)	(17,059)	(16,896)
Total Citigroup stockholders' equity	193,359	189,049
Noncontrolling interest	1,980	1,948
Total equity	195,339	190,997
Total liabilities and equity	1,881,734	1,864,660
Consumer
Loans, net of unearned income
Loans, net of unearned income	395,176	408,671
Corporate
Loans, net of unearned income
Loans, net of unearned income	251,188	246,793
Consolidated VIEs
Assets
Cash and due from banks (including segregated cash and other deposits)	723	498
Trading account assets	1,915	481
Investments	11,551	10,751
Loans, net of unearned income
Loans, net of unearned income	81,952	117,620
Allowance for loan losses	(3,635)	(5,854)
Total loans, net	78,317	111,766
Other assets	1,267	674
Total assets	93,773	124,170
Liabilities
Short-term borrowings	15,822	15,637
Long-term debt	25,593	26,346
Other liabilities	2,235	1,224
Total liabilities	43,650	43,207
Consolidated VIEs | Consumer
Loans, net of unearned income
Loans, net of unearned income	58,938	93,936
Consolidated VIEs | Corporate
Loans, net of unearned income
Loans, net of unearned income	$ 23,014	$ 23,684