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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 | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net gain (loss) from investment activities |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [1] | $ (495) | $ (2,502) | $ 798
Equity Contract [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [1] | (1,583) | (2,152) | 603
Credit Risk Contract [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [1] | $ 1,088 | (342) | 129
Commodity Contract [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) on derivatives not designated as hedging instruments recognized in income | [1] |  | $ (8) | $ 66
[1] | Gains (losses) recognized on derivatives are classified in net gain (loss) from investment activities in our 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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