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Financial Instruments Narrative (Details) bbl in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) bbl | Dec. 31, 2017 USD ($) bbl
Derivative [Line Items] |  |
Debt designated as net investment in foreign operations | $ | $ 901 | $ 884
Investment Segment |  |
Derivative [Line Items] |  |
Fair value derivative instruments with credit risk related contingent features in a liability position | $ | $ 0 | $ 17
Not designated as hedging instrument | Commodity contracts | Energy Segment |  |
Derivative [Line Items] |  |
Volume of derivatives (barrels) | bbl | 2.9 | 14.3
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 | 5.8

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- Definition Fair value of credit risk derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5708775-113959 + Details
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- Definition Fair value of all derivative liabilities designated as hedges of net investment in foreign operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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