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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 | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
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] | $ (1,113) | $ (213) | $ 1,161 | $ (1,392) |
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] | (1,697) | (150) | (229) | (1,251) |
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] | 584 | (68) | 1,390 | (132) |
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] |  | 5 |  | (9) |
Energy Segment | Cost of goods sold |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income |  | $ 20 | $ 4 | $ 65 | $ 20 | [1]
[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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