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Basis of Presentation and Summary of Significant Accounting Policies - Oil, Natural Gas and NGL Transportation and Other Expenses Restated Table (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Summary of Significant Accounting Policies [Table] [Line Items] |  |
Oil, natural gas and NGL | $ 474 | $ 517
Severance and ad valorem taxes | 189 | 134
Previously reported |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |
Oil, natural gas and NGL | 539 | 562
Severance and ad valorem taxes | 124 | 89
Restatement adjustment |  |
Summary of Significant Accounting Policies [Table] [Line Items] |  |
Oil, natural gas and NGL | (65) | (45)
Severance and ad valorem taxes | $ 65 | $ 45

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- Definition [Line Items] for Summary of Significant Accounting Policies [Table] [Table] + References No definition available. + Details
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- Definition Exploration costs from oil and gas producing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 + Details
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