Derivative Instruments (Details) (USD $) In Billions	Sep. 30, 2011	Dec. 31, 2010
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	$ 77,008	$ 78,905
Swap [Member] | Equity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	128	116
Swap [Member] | Commodity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	378	349
Swap [Member] | Interest rate contract
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	41,857	46,299
Spot futures and forwards [Member] | Foreign exchange
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	5,137	3,893
Spot futures and forwards [Member] | Commodity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	213	170
Written options [Member] | Foreign exchange
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	736	674
Written options [Member] | Equity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	573	430
Written options [Member] | Commodity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	323	264
Written options [Member] | Interest rate contract
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	4,115	4,075
Future and forwards [Member] | Equity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	38	49
Future and forwards [Member] | Interest rate contract
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	8,573	9,298
Purchased options [Member] | Foreign exchange
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	723	649
Purchased options [Member] | Equity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	524	377
Purchased options [Member] | Commodity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	316	254
Purchased options [Member] | Interest rate contract
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	4,285	3,968
Cross-currency swaps [Member] | Foreign exchange
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	2,891	2,568
Foreign exchange
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	9,487	7,784
Equity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	1,263	972
Credit derivatives
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	6,198	5,472
Commodity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	1,230	1,037
Interest rate contract
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	$ 58,830	$ 63,640