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Oil and Natural Gas Property Transactions - Narrative (Details) MMcf in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 29, 2018 USD ($) a well day $ / BTU | Sep. 30, 2018 USD ($) well | Sep. 30, 2017 USD ($) well MMcf | Sep. 30, 2018 USD ($) a well | Sep. 30, 2017 USD ($) a well MMcf
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from divestitures of proved and unproved properties |  |  |  | $ 395,000,000 | $ 1,193,000,000
Mid-Continent [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Productive gas wells, number of wells, net | well |  | 3,200 |  | 3,200 |
Proceeds from divestitures of proved and unproved properties |  |  |  | $ 491,000,000 |
Number of net acres | a |  |  |  | 238,500 |
Other properties [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from divestitures of proved and unproved properties |  | $ 8,000,000 | $ 248,000,000 | $ 31,000,000 | $ 331,000,000
Haynesville Shale [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Productive gas wells, number of wells, net | well |  |  | 576 |  | 576
Proceeds from divestitures of proved and unproved properties |  |  |  |  | $ 915,000,000
Number of net acres | a |  |  |  |  | 119,500
Haynesville Shale [Member] | Natural gas [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proved developed reserves (volume) | MMcf |  |  | 80 |  | 80
Subsequent Event [Member] | Utica Shale [Member] | Disposal group, disposed of by sale, not discontinued operations [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Area of land, gross (in acres) | a | 1,500,000 |  |  |  |
Area of land, net (in acres) | a | 900,000 |  |  |  |
Productive gas wells, number of wells, net | well | 920 |  |  |  |
Consideration received | $ 1,900,000,000 |  |  |  |
Subsequent Event [Member] | Utica Shale [Member] | Disposal group, disposed of by sale, not discontinued operations [Member] | Commercial Shale [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Area of land, net (in acres) | a | 320,000 |  |  |  |
Subsequent Event [Member] | Future natural gas prices [Member] | Utica Shale [Member] | Disposal group, disposed of by sale, not discontinued operations [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration received | $ 100,000,000 |  |  |  |
Period of trading days | day | 20 |  |  |  |
Consecutive trading days | day | 30 |  |  |  |
Subsequent Event [Member] | 2022 NYMEX Natural Gas [Member] | Future natural gas prices [Member] | Utica Shale [Member] | Disposal group, disposed of by sale, not discontinued operations [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration received | $ 50,000,000 |  |  |  |
Subsequent Event [Member] | 2022 NYMEX Natural Gas [Member] | Future Natural Gas Prices Twenty Twenty Two [Member] | Utica Shale [Member] | Disposal group, disposed of by sale, not discontinued operations [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Average Sales Prices | $ / BTU | 3.00 |  |  |  |
Subsequent Event [Member] | 2022 NYMEX Natural Gas [Member] | Future Natural Gas Prices Twenty Twenty Three [Member] | Utica Shale [Member] | Disposal group, disposed of by sale, not discontinued operations [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Average Sales Prices | $ / BTU | 3.25 |  |  |  |

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