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Financial Instruments Gain (Loss) Recognized on Derivatives Not Designated as Hedging Table (Details) - Net gain from investment activities - Not designated as hedging instrument - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [1] | $ (128) | $ (265) | $ 78 | $ (868)
Equity contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [1] | (147) | (262) | (89) | (835)
Credit contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [1] | 0 | 8 | 53 | (17)
Commodity contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [1] | 19 | (11) | 114 | (16)
Investment Segment |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [1] | $ (139) | $ (265) | $ 8 | $ (880)
[1] | Gains (losses) recognized on derivatives are classified in net gain (loss) from investment activities in our condensed consolidated statements of operations for our Investment segment and are included in other income (loss), net for all other segments. Gains (losses) recognized on derivatives for our Investment segment were $(139) million and $(265) million for the three months ended June 30, 2018 and 2017, respectively, and $8 million and $(880) million for the six months ended June 30, 2018 and 2017, respectively. Gains recognized on derivatives for our other segments were $11 million and zero for the three months ended June 30, 2018 and 2017, respectively, and $70 million and $12 million for the six months ended June 30, 2018 and 2017, respectively.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + 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=84234895&loc=SL5624171-113959 + Details
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