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Financial Instruments Narrative (Details) bbl in Millions, $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) bbl | Dec. 31, 2018 USD ($) bbl
Investment Segment |  |
Derivative [Line Items] |  |
Fair value derivative instruments with credit risk related contingent features in a liability position | $ | $ 56 | $ 0
Not designated as hedging instrument | Commodity contracts not considered probable of settlement [Member] | Energy Segment |  |
Derivative [Line Items] |  |
Volume of derivatives (barrels) | bbl | 4 | 2

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- Definition Fair value of credit risk derivative liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5708775-113959 + 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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- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
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- Details
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- Details
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- Details
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