Cash Instruments (Details 3) (USD $) In Millions	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	$ 644,772	$ 641,556	$ 637,514
Total financial liabilities at fair value	388,492		381,604
Level 2 [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	554,884		566,535
Total financial liabilities at fair value	290,923		299,325
Level 2 [Member] | CDOs backed by real estate assets [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	210		212
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	786		368
Level 3 [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	47,007	45,843	45,377
Total financial liabilities at fair value	25,875		24,054
Level 3 [Member] | CDOs backed by real estate assets [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	684		565
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	1,450		1,070
Level 3 [Member] | Private equity investments [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	11,930		10,030
Level 3 [Member] | Real Estate Investments [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	1,170		874
Level 3 [Member] | Convertible Debt Securities [Member]
Cash Instruments (Textuals) [Abstract]
Total financial assets at fair value	348		156
Level 3 [Member] | CDOs and CLOs backed by corporate obligations liabilities [Member]
Cash Instruments (Textuals) [Abstract]
Total financial liabilities at fair value	$ 14		$ 35