CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Federal funds sold and securities borrowed or purchased under agreements to resell, at fair value	$ 175,015	$ 160,589
Trading account assets, pledged to creditors	107,023	105,458
Investments, pledged to creditors	27,824	21,423
Investments, at fair value	285,312	294,463
Loans at fair value	5,198	5,287
Other assets, at fair value	8,684	13,299
Federal funds purchased and securities loaned or sold under agreements to repurchase, at fair value	119,427	116,689
Short-term borrowings, at fair value	4,495	818
Long-term debt, at fair value	26,624	29,764
Other liabilities, at fair value	2,425	2,910
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, authorized shares (in shares)	30,000,000	30,000,000
Preferred stock, issued shares, at aggregate liquidation value (in shares)	209,720	102,038
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	6,000,000,000	6,000,000,000
Common stock, issued shares (in shares)	3,062,096,040	3,043,153,204
Treasury stock, shares (in shares)	29,095,963	14,269,301
U.S.
Interest-bearing deposits, at fair value	949	889
Outside of U.S.
Interest-bearing deposits, at fair value	698	558
Consumer
Loans at fair value	996	1,231
Corporate
Loans at fair value	4,202	4,056
Consolidated VIEs
Short-term borrowings, at fair value	97
Long-term debt, at fair value	961	1,330
Consolidated VIEs | Consumer
Loans at fair value	951	1,191
Consolidated VIEs | Corporate
Loans at fair value	$ 15	$ 157