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Subsequent Events (Details) $ / shares in Units, $ in Millions |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 30, 2018 USD ($) $ / shares shares | Oct. 29, 2018 USD ($) a well | Sep. 30, 2018 | Sep. 30, 2017 USD ($)
Senior notes [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Debt redemption, percent of principal amount of notes to be redeemed |  |  | 100.00% |
Debt redemption, percent of aggregate amount of notes to be redeemed |  |  | 35.00% |
8.00% Senior Secured Second Lien Notes Due 2022 [Member] | Senior notes [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Interest rate, stated percentage |  |  | 8.00% | 8.00%
Debt instrument, repurchased face amount |  |  |  | $ 260
Subsequent Event [Member] | Disposal group, disposed of by sale, not discontinued operations [Member] | Utica Shale [Member] |  |  |  |
Subsequent Event [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 |  |
Subsequent Event [Member] | Commercial Shale [Member] | Disposal group, disposed of by sale, not discontinued operations [Member] | Utica Shale [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Area of land, net (in acres) | a |  | 320,000 |  |
Subsequent Event [Member] | Wildhorse Resource Development Corporation [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Consideration paid | $ 3,977 |  |  |
Debt assumed | $ 930 |  |  |
Subsequent Event [Member] | Wildhorse Resource Development Corporation [Member] | Acquisition Scenario One [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of shares issued per share acquired | shares | 5.989 |  |  |
Subsequent Event [Member] | Wildhorse Resource Development Corporation [Member] | Acquisition Scenario Two [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of shares issued per share acquired | shares | 5.336 |  |  |
Value issued per share acquired (in USD per share) | $ / shares | $ 3.00 |  |  |
Subsequent Event [Member] | 8.00% Senior Secured Second Lien Notes Due 2022 [Member] | Senior notes [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Debt instrument, repurchased face amount |  | $ 1,416 |  |
Debt redemption, percent of principal amount of notes to be redeemed |  | 100.00% |  |
Debt redemption, percent of aggregate amount of notes to be redeemed |  | 100.00% |  |

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