| **Fair Value Measurements and Disclosures - Narrative (Details) - USD ($) $ in Millions**        | 3 Months Ended | 9 Months Ended |        |        |        |        |
|--------------------------------------------------------------------------------------------------|----------------|----------------|--------|--------|--------|--------|
||
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]** |           |           |   |   |   |   |   |   |   |   |
| Equity owned (units)                                                                             | 0              |           |   |   | 0      |   |   |   |   | 21,692,198 |
| Asset Impairments                                                                                | $ 0            |           |   | $ 0    | $ 168  | $ 0    |   |   |   |   |
| CONE Gathering LLC                                                                               |           |           |   |   |   |   |   |   |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]** |           |           |   |   |   |   |   |   |   |   |
| Shares sold (in shares)                                                                          | 14,200,000     | 7,500,000      |   |   |   |   |   |   |   |   |
| Ownership                                                                                        | 22.30%         |           |   |   | 22.30% |   |   | 34.10% | 50.00% |   |
| Disposal Group, Disposed of by Sale, Not Discontinued Operations | Tamar and Dalit Fields        |           |           |   |   |   |   |   |   |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]** |           |           |   |   |   |   |   |   |   |   |
| Discount percent                                                                                 |           |           |   |   |   |   | 15.00% |   |   |   |
| Disposal Group, Disposed of by Sale, Not Discontinued Operations | Gulf of Mexico Assets         |           |           |   |   |   |   |   |   |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]** |           |           |   |   |   |   |   |   |   |   |
| Asset Impairments                                                                                |           |           | $ 168  |   | $ 168  |   |   |   |   |   |
| CNX Midstream Partners                                                                           |           |           |   |   |   |   |   |   |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]** |           |           |   |   |   |   |   |   |   |   |
| Equity owned (units)                                                                             |           |           |   |   |   |   |   | 21,700,000 |   |   |

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| - Definition
Balance held at close of period in number of shares.
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