Derivative Instruments - Notional Amount of Derivative Contracts (Details) (USD $) In Billions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Jul. 02, 2012
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	$ 63,662.0	$ 70,413.0
Interest rate contracts
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	48,085.0	54,705.0
Interest rate contracts | Swaps
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	29,734.0	35,221.0
Interest rate contracts | Futures and forwards
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	10,189.0	11,238.0
Interest rate contracts | Written options
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	3,903.0	4,059.0
Interest rate contracts | Purchased options
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	4,259.0	4,187.0
Credit derivatives
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	4,249.0	5,331.0
Foreign exchange contracts
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	9,585.0	8,572.0
Foreign exchange contracts | Cross-currency swaps
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	3,346.0	3,488.0
Foreign exchange contracts | Spot, futures and forwards
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	4,669.0	3,773.0
Foreign exchange contracts | Written options
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	790.0	659.0
Foreign exchange contracts | Purchased options
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	780.0	652.0
Equity contracts
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	1,063.0	1,042.0
Equity contracts | Swaps
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	206.0	187.0
Equity contracts | Futures and forwards
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	50.0	50.0
Equity contracts | Written options
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	432.0	425.0
Equity contracts | Purchased options
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	375.0	380.0
Commodity contracts
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	680.0	763.0
Commodity contracts | Swaps
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	126.0	124.0
Commodity contracts | Spot, futures and forwards
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	193.0	234.0
Commodity contracts | Written options
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	181.0	202.0
Commodity contracts | Purchased options
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts	180.0	203.0
Chief Investment Office | Credit derivatives | Synthetic credit derivatives
Notional amount of derivative contracts outstanding [Abstract]
Total derivative notional amounts			$ 12.0