| Financial Instruments, Owned, at Fair Value | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Financial Instruments, Owned, at Fair Value, Total | en-US | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |