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Financial Instruments Gain (Loss) Recognized on Derivatives Not Designated as Hedging Table (Details) (Not Designated as Hedging Instrument [Member], Net Gain from Investment Activities [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Derivative [Line Items] |  |  |  |  |  |  |  |
Gain (Loss) Recognized in Income, Derivatives Not Designated as Hedging | $ 5 | [1] | $ 7 | [1] | $ (438) | [1] | $ 39 | [1]
Equity Contract [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Gain (Loss) Recognized in Income, Derivatives Not Designated as Hedging | (59) | [1] | 1 | [1] | (461) | [1] | 10 | [1]
Foreign Exchange Contract [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Gain (Loss) Recognized in Income, Derivatives Not Designated as Hedging | 66 | [1] | (2) | [1] | 25 | [1] | (13) | [1]
Credit Risk Contract [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Gain (Loss) Recognized in Income, Derivatives Not Designated as Hedging | 0 | [1] | (6) | [1] | 0 | [1] | 19 | [1]
Futures Index Spread [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Gain (Loss) Recognized in Income, Derivatives Not Designated as Hedging | 0 | [1] | 14 | [1] | 0 | [1] | 23 | [1]
Commodity contracts [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Gain (Loss) Recognized in Income, Derivatives Not Designated as Hedging | $ (2) | [1] | $ 0 | [1] | $ (2) | [1] | $ 0 | [1]
[1] | Gains (losses) recognized on derivatives are classified in net gain from investment activities in our consolidated statements of operations.

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- Definition Net gain (loss) from the increase (decrease) in fair value of derivative instrument not designated as hedging instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Details
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