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Financial Instruments Gain (Loss) Recognized on Derivatives Not Designated as Hedging Table (Details) - Investment Segment - Net gain (loss) from investment activities - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |  |
Derivative gain (loss) recognized in income | $ (2,502) | $ 798 | $ (1,969)
Equity Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative gain (loss) recognized in income | (2,152) | 603 | (1,815)
Credit Risk Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative gain (loss) recognized in income | (342) | 129 | (42)
Commodity Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative gain (loss) recognized in income | $ (8) | $ 66 | $ (112)

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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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- 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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