Cash Instruments (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		18 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	$ 618,804		$ 618,804		$ 618,804	$ 643,833	$ 638,513
Total financial liabilities at fair value	381,656		381,656		381,656	389,468	377,677
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Market Making Revenue	241	59	662	187
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Other Principal Transactions Revenue	612	409	1,380	960
Fair Value, Assets Measured on Recurring Basis, Gain (Loss) Included in Interest Income	222	340	400	667
Fair Value, Investments Entities That Calculate Net Asset Value Per Share, Investment Redemption Amount In Certain Hedge Funds	270		530		1,590
Cash Instruments [Member]
Cash Instruments (Textuals) [Abstract]
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date	723	408	1,730	1,030
Level 2 [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	492,118		492,118		492,118	512,909	502,293
Total financial liabilities at fair value	300,929		300,929		300,929	304,217	318,764
Level 2 [Member] | CDOs backed by real estate assets [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	317		317		317		489
Level 2 [Member] | CDOs and CLOs backed by corporate and other debt obligations assets [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	616		616		616		284
Level 2 [Member] | Cash Instruments [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	115,185		115,185		115,185		135,374
Total financial liabilities at fair value	10,694		10,694		10,694		9,645
Level 3 [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	42,824		42,824		42,824	46,023	47,095
Total financial liabilities at fair value	22,564		22,564		22,564	24,759	25,679
Level 3 [Member] | CDOs backed by real estate assets [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	404		404		404		446
Level 3 [Member] | CDOs and CLOs backed by corporate and other debt obligations assets [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	1,500		1,500		1,500		1,760
Level 3 [Member] | Private equity investments [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	13,520		13,520		13,520		12,670
Level 3 [Member] | Real Estate Investments [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	1,470		1,470		1,470		1,580
Level 3 [Member] | Convertible Debt Securities [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	425		425		425		600
Level 3 [Member] | Cash Instruments [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	33,901		33,901		33,901		35,749
Total financial liabilities at fair value	$ 385		$ 385		$ 385		$ 642