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Asset Acquisitions, Dispositions and Other (Details) - USD ($) $ in Millions | 1 Months Ended
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Sep. 30, 2016 | Aug. 31, 2016
Asset Acquisition, Disposition and Other Transactions [Line Items] |  |
Crude oil supply agreements termination costs |  | $ 160
Libya operations |  |
Asset Acquisition, Disposition and Other Transactions [Line Items] |  |
Impairment charges | $ 112 |
South Texas Eagle Ford non-operated properties | Disposed of by sale |  |
Asset Acquisition, Disposition and Other Transactions [Line Items] |  |
Sale consideration | 63 |
Pre-tax gain on disposal | $ 59 |

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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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