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SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Costs Not Subject to Amortization) (Details) $ in Billions | 12 Months Ended
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Dec. 31, 2016 USD ($)
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |
Reclassification to Well, Facilities, and Equipment Based on Determination of Proved Reserves | $ 4.9
Unproved properties [Member] |
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items] |
Proceeds from sales | $ 1.6

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- Definition The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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