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Financial Instruments Gain (Loss) Recognized on Derivatives Not Designated as Hedging Table (Details) - Not designated as hedging instrument - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Investment Segment | Net gain from investment activities |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [1] | $ (262) | $ (539) | $ (1,654) | $ (531)
Investment Segment | Net gain from investment activities | Equity contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [1] | (213) | (564) | (1,464) | (653)
Investment Segment | Net gain from investment activities | Credit contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [1] | (52) | 12 | (184) | 65
Investment Segment | Net gain from investment activities | Commodity contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [1] | 3 | 13 | (6) | 57
Energy Segment | Cost of goods sold |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [1] | $ 18 | $ 5 | $ 38 | $ 75
[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.

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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