CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Federal funds sold and securities borrowed or purchased under agreements to resell, at fair value	$ 164,166	$ 160,589
Trading account assets, pledged to creditors	123,218	105,458
Investments, pledged to creditors	27,680	21,423
Investments, at fair value	283,098	294,463
Loans at fair value	4,868	5,287
Other assets, at fair value	10,521	13,299
Federal funds purchased and securities loaned or sold under agreements to repurchase, at fair value	120,512	116,689
Short-term borrowings, at fair value	4,493	818
Long-term debt, at fair value	27,157	29,764
Other liabilities, at fair value	2,665	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)	171,720	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)	3,062,092,531	3,043,153,204
Treasury stock, shares (in shares)	21,066,042	14,269,301
U.S.
Interest-bearing deposits, at fair value	895	889
Outside of U.S.
Interest-bearing deposits, at fair value	616	558
Consumer
Loans at fair value	1,041	1,231
Corporate
Loans at fair value	3,827	4,056
Consolidated VIEs
Long-term debt, at fair value	1,114	1,330
Consolidated VIEs | Consumer
Loans at fair value	995	1,191
Consolidated VIEs | Corporate
Loans at fair value	$ 137	$ 157