Financial Instruments Gain (Loss) Recognized on Derivatives Not Designated as Hedging Table (Details) (Not Designated as Hedging Instrument [Member], Net gain (loss) from investment activities [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Derivative [Line Items]
Gain (Loss) Recognized in Income	$ (628)	[1]	$ (440)	[1]
Equity contracts
Derivative [Line Items]
Gain (Loss) Recognized in Income	(645)	[1]	(399)	[1]
Foreign exchange contracts
Derivative [Line Items]
Gain (Loss) Recognized in Income	68	[1]	(41)	[1]
Commodity contracts
Derivative [Line Items]
Gain (Loss) Recognized in Income	$ (51)	[1]	$ 0	[1]

[1] ) Gains (losses) recognized on derivatives are classified in net gain from investment activities in our consolidated statements of operations for our Investment segment and are included in other income (loss), net for all other segment