Derivative Instruments (Details) (USD $) In Billions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	$ 72,383.0	$ 71,156.0
Interest rate contract
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	54,463.0	54,460.0
Credit derivatives
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	6,198.0	5,774.0
Foreign exchange
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	9,195.0	8,787.0
Equity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	1,294.0	1,022.0
Commodity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	1,233.0	1,113.0
Swap [Member] | Interest rate contract
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	34,730.0	38,704.0
Swap [Member] | Equity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	161.0	119.0
Swap [Member] | Commodity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	336.0	341.0
Future and forwards [Member] | Interest rate contract
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	11,852.0	7,888.0
Future and forwards [Member] | Equity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	53.0	38.0
Cross-currency swaps [Member] | Foreign exchange
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	3,393.0	2,931.0
Spot futures and forwards [Member] | Foreign exchange
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	4,447.0	4,512.0
Spot futures and forwards [Member] | Commodity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	228.0	188.0
Written options [Member] | Interest rate contract
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	3,884.0	3,842.0
Written options [Member] | Foreign exchange
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	674.0	674.0
Written options [Member] | Equity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	561.0	460.0
Written options [Member] | Commodity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	340.0	310.0
Purchased options [Member] | Interest rate contract
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	3,997.0	4,026.0
Purchased options [Member] | Foreign exchange
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	681.0	670.0
Purchased options [Member] | Equity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	519.0	405.0
Purchased options [Member] | Commodity
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	329.0	274.0
Chief Investment Office [Member] | Synthetic Credit Derivatives [Member] | Credit derivatives
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	$ 12.0