| **Acquisitions, Divestitures and Merger - Narrative (Details)**                                                                   |               |               |                 |               |               |                 | 1 Months Ended | 3 Months Ended | 5 Months Ended | 12 Months Ended |                 |                 |
|-----------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|-----------------|---------------|---------------|-----------------|----------------|----------------|----------------|-----------------|-----------------|-----------------|
||
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Sales Proceeds                                                                                                                    |          |          |            |          |          |            |           |           |           |            | $ 2,073,000,000 | $ 1,241,000,000 | $ 151,000,000 |   |   |
| Loss on Marcellus Shale Upstream Divestiture                                                                                      |          |          |            |          |          |            |           |           |           |            | 2,379,000,000   | $ 0             | 0 |   |   |
| Exit costs                                                                                                                        |          |          |            |          |          |            |           |           |           |            | 41,000,000      |            |   |   |   |
| Commitment to third party for assumption of retained capacity                                                                     |          |          |            |          |          |            |           |           |           |            | $ 52,000,000    |            |   |   |   |
| Ownership interest sold                                                                                                           |          |          |            |          |          |            |           |           | 35.00%         |            | 35.00%          | 35.00%          |   |   |   |
| Asset retirement obligation                                                                                                       |          |          |            |          |          |            |           |           | $ 935,000,000  | $ 989,000,000   | $ 875,000,000   | $ 935,000,000   | 989,000,000 |   |   |
| Gain (loss) on disposition of assets                                                                                              |          |          |            |          |          |            |           |           |           |            | 326,000,000     | 238,000,000     | 0 |   |   |
| Cash paid                                                                                                                         |          |          |            |          |          |            |           |           |           |            | 616,000,000     | 0               | 0 |   |   |
| Equity Method Investments                                                                                                         |          |          |            |          |          |            |           |           | 400,000,000    | 453,000,000     | $ 305,000,000   | $ 400,000,000   | 453,000,000 |   |   |
| Stock issued (shares) | shares                                                                                                    |          |          |            |          |          |            |           |           |           |            | 54,087,136      | 0               |   |   |   |
| Proceeds from issuance of common limited partners units                                                                           |          |          |            |          |          |            |           |           |           |            | $ 312,000,000   | $ 299,000,000   | 0 |   |   |
| Proceeds from debt                                                                                                                |          |          |            |          |          |            |           |           |           |            | 325,000,000     | 0               | 0 |   |   |
| Gain (loss) on divestitures                                                                                                       |          |          |            |          |          |            |           |           |           |            | 326,000,000     | 238,000,000     | 0 |   |   |
| Severance, consulting, investment, advistory, legal and other related merger-related fees                                         |          |          |            |          |          |            |           |           |           |            | 100,000,000     | 0               | $ 0 |   |   |
| Revenue since acquisition                                                                                                         |          |          |            |          |          |            |           |           |           | 181,000,000     |            | 457,000,000     |   |   |   |
| Pre-tax loss since acquisition                                                                                                    |          |          |            |          |          |            |           |           |           | 120,000,000     |            | 20,000,000      |   |   |   |
| Purchase price allocation adjustment                                                                                              |          |          |            |          |          |            |           |           |           | $ 163,000,000   |            | $ 25,000,000    |   |   |   |
| Marcellus Shale                                                                                                                   |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Total consideration value                                                                                                         |          |          | $ 1,200,000,000 |          |          |            |           |           |           |            |            |            |   |   |   |
| Sales Proceeds                                                                                                                    |          |          | 1,000,000,000   |          |          |            |           |           |           |            |            |            |   |   |   |
| Consideration adjustment                                                                                                          |          |          | $ 100,000,000   |          |          |            |           |           |           |            |            |            |   |   |   |
| Additional consideration, number of payments, divestiture | payment                                                               |          |          | 3               |          |          |            |           |           |           |            |            |            |   |   |   |
| Additional consideration, Individual payment amounts                                                                              |          |          | $ 33,300,000    |          |          |            |           |           |           |            |            |            |   |   |   |
| Minimum Appalachia Dominion, South Point index price for contingent consideration to be required ($ per MMBtu) | $ / MMBTU        |          |          | 3.30            |          |          |            |           |           |           |            |            |            |   |   |   |
| Loss on Marcellus Shale Upstream Divestiture                                                                                      |          |          |            |          |          |            |           |           |           |            | 2,400,000,000   |            |   |   |   |
| Loss on sale of property, after tax                                                                                               |          |          |            |          |          |            |           |           |           |            | $ 1,500,000,000 |            |   |   |   |
| Asset consideration                                                                                                               |          |          | $ 3,400,000,000 |          |          |            |           |           |           |            |            |            |   |   |   |
| Natural gas production per day | MMcf / d                                                                                         |          |          |            |          |          |            |           |           |           |            | 204             |            |   |   |   |
| Southwest Royalties                                                                                                               |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Equity method investment, amount sold                                                                                             |          |          |            |          |          |            |           |           |           |            | $ 102,000,000   |            |   |   |   |
| Asset retirement obligation                                                                                                       |          |          |            |          |          |            |           |           |           |            | 42,000,000      |            |   |   |   |
| Onshore US                                                                                                                        |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Proceeds from divestiture of businesses                                                                                           |          |          |            |          |          |            |           |           |           |            | 671,000,000     |            |   |   |   |
| Proceeds expected from divestiture                                                                                                |          |          |            |          |          |            |           |           |           |            | 40,000,000      |            |   |   |   |
| DJ Basin (Onshore US)                                                                                                             |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Proceeds from divestiture of businesses                                                                                           |          |          |            |          |          |            |           |           |           |            | 568,000,000     |            |   |   |   |
| Mineral and Royalty Assets                                                                                                        |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Sales Proceeds                                                                                                                    |          |          |            |          |          |            |           |           |           |            | 335,000,000     |            |   |   |   |
| Gain (loss) on disposition of assets                                                                                              |          |          |            |          |          |            |           |           |           |            | $ 334,000,000   |            |   |   |   |
| Mineral and royalty assets, area | a                                                                                              |          |          |            |          |          |            |           |           |           |            | 140,000         |            |   |   |   |
| CONE Gathering LLC                                                                                                                |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Ownership percentage                                                                                                              |          |          |            |          |          |            |           |           |           |            | 50.00%          |            |   |   |   |
| Equity Method Investments                                                                                                         |          |          |            |          |          |            |           |           |           |            | $ 181,000,000   |            |   |   |   |
| CONSOL Carried Cost Obligation                                                                                                    |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Cash remitted                                                                                                                     |          |          |            |          |          |            |           |           | 213,000,000    |            |            |            |   |   |   |
| Wells Ranch Development Area                                                                                                      |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Land exchanged (acres) | a                                                                                                        |          |          |            |          |          |            |           |           |           |            |            | 11,700          |   |   |   |
| Bronco Development Area                                                                                                           |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Land sold (acres) | a                                                                                                             |          |          |            |          |          |            |           |           |           |            |            | 13,500          |   |   |   |
| Tamar Field, Offshore Israel                                                                                                      |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Total consideration value                                                                                                         |          |          |            |          |          |            |           |           | $ 431,000,000  |            |            | $ 431,000,000   |   |   |   |
| Sales Proceeds                                                                                                                    |          |          |            |          |          |            |           |           |           |            |            | $ 316,000,000   |   |   |   |
| Ownership interest sold                                                                                                           |          |          |            |          |          |            |           |           | 3.50%          |            |            | 3.50%           |   |   |   |
| Gain (loss) on divestitures                                                                                                       |          |          |            |          |          |            |           |           |           |            |            | $ 261,000,000   |   |   |   |
| Ownership percentage required per agreement                                                                                       |          |          |            |          |          |            |           |           | 25.00%         |            |            | 25.00%          |   |   |   |
| Delaware Basin                                                                                                                    |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Number of wells | well                                                                                                            |          |          |            |          |          |            |           | 7              |           |            |            |            |   |   |   |
| Consideration transferred                                                                                                         |          |          |            |          |          |            |           | $ 301,000,000  |           |            |            |            |   |   |   |
| Proceeds allocated to undeveloped leasehold cost                                                                                  |          |          |            |          |          |            |           | 246,000,000    |           |            |            |            |   |   |   |
| Cash paid                                                                                                                         |          |          |            |          |          |            |           |           | $ 30,000,000   |            |            |            |   |   |   |
| Rosetta Resources, Inc                                                                                                            |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Stock issued (shares) | shares                                                                                                    |          |          |            |          |          | 41,000,000      |           |           |           |            |            |            |   |   |   |
| Number of businesses acquired | business                                                                                          |          |          |            |          |          | 2               |           |           |           |            |            |            |   |   |   |
| Merger-related costs incurred                                                                                                     |          |          |            |          |          | $ 81,000,000    |           |           |           |            |            |            |   |   |   |
| Severance, consulting, investment, advistory, legal and other related merger-related fees                                         |          |          |            |          |          | 66,000,000      |           |           |           |            |            |            |   |   |   |
| Noncash share-based compensation expense                                                                                          |          |          |            |          |          | $ 15,000,000    |           |           |           |            |            |            |   |   |   |
| Common Stock | Rosetta Resources, Inc                                                                                             |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Business combination, stock exchange ratio                                                                                        |          |          |            |          |          | 0.542           |           |           |           |            |            |            |   |   |   |
| Delaware Basin Area | Rosetta Resources, Inc                                                                                      |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Gas and oil area acquired | a                                                                                                     |          |          |            |          |          | 45,000          |           |           |           |            |            |            |   |   |   |
| Midland Basin | Rosetta Resources, Inc                                                                                            |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Gas and oil area acquired | a                                                                                                     |          |          |            |          |          | 9,000           |           |           |           |            |            |            |   |   |   |
| Long-term debt, fair value                                                                                                        |          |          |            |          |          | $ 2,000,000,000 |           |           |           |            |            |            |   |   |   |
| Eagle Ford Shale | Rosetta Resources, Inc                                                                                         |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Gas and oil area acquired | a                                                                                                     |          |          |            |          |          | 50,000          |           |           |           |            |            |            |   |   |   |
| Delaware Basin | Rosetta Resources, Inc                                                                                           |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Gas and oil area acquired | a                                                                                                     |          |          |            |          |          | 54,000          |           |           |           |            |            |            |   |   |   |
| Noble Midstream Partners LP | Blanco River DevCo                                                                                  |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Ownership interest acquired                                                                                                       |          |          |            | 15.00%        |          |            |           |           |           |            |            |            |   |   |   |
| Ownership interest acquired, step acquisition                                                                                     |          |          |            | 40.00%        |          |            |           |           |           |            |            |            |   |   |   |
| Noble Midstream Partners LP | Colorado River DevCo                                                                                |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Ownership interest acquired                                                                                                       |          |          |            | 20.00%        |          |            |           |           |           |            |            |            |   |   |   |
| Noble Midstream Partners LP | Blanco River and Colorado River DevCos                                                              |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Consideration transferred                                                                                                         |          |          |            | $ 270,000,000 |          |            |           |           |           |            |            |            |   |   |   |
| Noble Midstream Partners LP | Advantage Pipeline                                                                                  |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Consideration transferred                                                                                                         |          |          |            |          | $ 133,000,000 |            |           |           |           |            |            |            |   |   |   |
| Ownership percentage                                                                                                              |          |          |            |          | 50.00%        |            |           |           |           |            |            |            |   |   |   |
| Length of pipeline | mi                                                                                                           |          |          |            |          | 70            |            |           |           |           |            |            |            |   |   |   |
| Shipping capacity per day (bbls/day) | bbl / d                                                                                    |          |          |            |          | 150           |            |           |           |           |            |            |            |   |   |   |
| Storage capacity (bbls) | bbl                                                                                                     |          |          |            |          | 490           |            |           |           |           |            |            |            |   |   |   |
| Noble Midstream Partners LP | Black Diamond Gathering LLC                                                                         |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Ownership interest                                                                                                                |          |          |            |          |          |            |           |           |           |            | 54.40%          |            |   |   |   |
| Subsequent Event | Southwest Royalties                                                                                            |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Proceeds from divestiture of businesses                                                                                           |          |          |            |          |          |            | $ 60,000,000   |           |           |            |            |            |   |   |   |
| Subsequent Event | CONE Gathering LLC                                                                                             |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Proceeds from divestiture of businesses                                                                                           |          |          |            |          |          |            | $ 308,000,000  |           |           |            |            |            |   |   |   |
| Subsequent Event | Gulf of Mexico                                                                                                 |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Total consideration value                                                                                                         |          |          |            |          |          |            |           |           |           |            |            |            |   | $ 480,000,000 |   |
| Asset consideration                                                                                                               |          |          |            |          |          |            |           |           |           |            |            |            |   | 750,000,000 |   |
| Obligations divested                                                                                                              |          |          |            |          |          |            |           |           |           |            |            |            |   | $ 230,000,000 |   |
| Subsequent Event | Noble Midstream Partners LP | Saddle Butte                                                                     |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Length of pipeline | mi                                                                                                           | 160           |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Shipping capacity per day (bbls/day) | bbl / d                                                                                    | 300           |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Storage capacity (bbls) | bbl                                                                                                     | 210           |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Gas and oil area acquired | a                                                                                                     | 141,000       |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Subsequent Event | Black Diamond Gathering LLC | Saddle Butte                                                                     |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Cash paid                                                                                                                         | $ 638,500,000 |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Tamar and Dalit Fields | Subsequent Event                                                                                         |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Ownership interest in equity method investments                                                                                   |          | 25.00%        |            |          |          |            |           |           |           |            |            |            |   |   | 32.50% |
| CNX Midstream Partners                                                                                                            |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Investment, net book value                                                                                                        |          |          |            |          |          |            |           |           |           |            | $ 70,000,000    |            |   |   |   |
| Owned (shares) | shares                                                                                                           |          |          |            |          |          |            |           |           |           |            | 21,700,000      |            |   |   |   |
| Ownership                                                                                                                         |          |          |            |          |          |            |           |           |           |            | 33.50%          |            |   |   |   |
| Advantage Joint Venture                                                                                                           |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Payments to acquire interest in joint venture                                                                                     |          |          |            |          | $ 67,000,000  |            |           |           |           |            |            |            |   |   |   |
| Disposal Group, Disposed of by Sale, Not Discontinued Operations | Producing and Undeveloped Net Acres in the DJ Basin            |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Sales Proceeds                                                                                                                    |          |          |            |          |          |            |           |           |           |            |            | $ 486,000,000   |   |   |   |
| Land sold (acres) | a                                                                                                             |          |          |            |          |          |            |           |           |           |            |            | 33,100          |   |   |   |
| Consideration expected                                                                                                            |          |          |            |          |          |            |           |           | 505,000,000    |            |            | $ 505,000,000   |   |   |   |
| Disposal Group, Disposed of by Sale, Not Discontinued Operations | Bowdoin Property                                               |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Sales Proceeds                                                                                                                    |          |          |            |          |          |            |           |           |           |            |            | 152,000,000     |   |   |   |
| Gain (loss) on divestitures                                                                                                       |          |          |            |          |          |            |           |           |           |            |            | (23,000,000)    |   |   |   |
| Disposal Group, Disposed of by Sale, Not Discontinued Operations | Alon A And Alon C                                              |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Total consideration value                                                                                                         |          |          |            |          |          |            |           |           | 73,000,000     |            |            | 73,000,000      |   |   |   |
| Consideration adjustment                                                                                                          |          |          |            |          |          |            |           |           |           |            |            | 6,000,000       |   |   |   |
| Asset consideration                                                                                                               |          |          |            |          |          |            |           |           | $ 67,000,000   |            |            | $ 67,000,000    |   |   |   |
| Ownership interest sold                                                                                                           |          |          |            |          |          |            |           |           | 47.00%         |            |            | 47.00%          |   |   |   |
| Disposal Group, Disposed of by Sale, Not Discontinued Operations | Cyprus Block 12                                                |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Proceeds from divestiture of businesses                                                                                           |          |          |            |          |          |            |           | $ 40,000,000   |           |            |            | $ 131,000,000   |   |   |   |
| Disposal Group, Disposed of by Sale, Not Discontinued Operations | Subsequent Event | Tamar and Dalit Fields                      |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Ownership interest sold                                                                                                           |          | 7.50%         |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Proceeds from sale of ownership interest                                                                                          |          | $ 560,000,000 |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Shares received in divestiture of interest in equity method investment (in shares) | shares                                       |          | 38,500,000    |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Disposal Group, Held-for-sale, Not Discontinued Operations | Tamar and Dalit Fields                                               |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Investment, net book value                                                                                                        |          |          |            |          |          |            |           |           |           |            | $ 293,000,000   |            |   |   |   |
| Leaseholds and Leasehold Improvements | Marcellus Shale                                                                           |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Asset consideration                                                                                                               |          |          | $ 883,000,000   |          |          |            |           |           |           |            |            |            |   |   |   |
| Subsidiaries | Blanco River and Colorado River DevCos                                                                             |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]** |          |          |            |          |          |            |           |           |           |            |            |            |   |   |   |
| Consideration transferred                                                                                                         |          |          |            | 270,000,000   |          |            |           |           |           |            |            |            |   |   |   |
| Cash paid                                                                                                                         |          |          |            | $ 245,000,000 |          |            |           |           |           |            |            |            |   |   |   |
| Developed gas and oil area | a                                                                                                    |          |          |            | 111,000       |          |            |           |           |           |            |            |            |   |   |   |
| Stock issued (shares) | shares                                                                                                    |          |          |            | 562,430       |          |            |           |           |           |            |            |            |   |   |   |
| Proceeds from issuance of common limited partners units                                                                           |          |          |            | $ 138,000,000 |          |            |           |           |           |            |            |            |   |   |   |
| Proceeds from debt                                                                                                                |          |          |            | $ 90,000,000  |          |            |           |           |           |            |            |            |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                             |
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| - Definition
Business Combination, Acquisition Relate Costs Related To Noncash Share-based Compensation Expense
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Business Combination, Acquisition Related Costs Including Noncash Share-based Compensation Expense
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| - Definition
Business Combination, Gas And Oil Area Acquired
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Business Combination, Stock Exchange Ratio
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| - Definition
Commitment to Third Party for Assumption of Retained Capacity
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| - Definition
Disposal Group, Including Discontinued Operation, Cash Remitted
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| - Definition
Disposal Group, Including Discontinued Operation, Minimum Index Price For Contingent Payments to be Required
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| - Definition
Disposal Group, Including Discontinued Operation, Purchase and Sales Agreement, Land Sold
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| - Definition
Disposal Group, Including Discontinued Operations, Adjustment To Consideration
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No definition available.
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| - Definition
Disposal Group, Including Discontinued Operations, Adjustment To Consideration, Individual Payment Amounts
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| - Definition
Disposal Group, Including Discontinued Operations, Adjustment To Consideration, Number of Payments
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No definition available.
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| - Definition
Disposal Group, Including Discontinued Operations, Purchase And Sales Agreement, Land Exchanged
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No definition available.
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| - Definition
Disposal Group, Including Discontinued Operations, Purchase and Sale Agreement, Consideration Expected
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No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Disposal Group, Mineral and Royalty Assets, Area
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| - Definition
Disposal Group, Not Discontinued Operation, Percentage Sold
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| - Definition
Equity Investment, Ownership Percentage Required per Agreement
+ References
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| - Definition
Length Of Pipeline
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| - Definition
Natural Gas Production Per Day
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| - Definition
Number Of Wells
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| - Definition
Ownership Interest, Percentage
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No definition available.
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| - Definition
Proceeds Allocated to Undeveloped Leasehold Cost
+ References
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| - Definition
Proceeds Expected From Divestiture
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Shares Received in Divestiture of Interest in Equity Method Investment
+ References
No definition available.
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| - Definition
Shipping Capacity Per Day
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| - Definition
Storage Capacity
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount classified as assets attributable to disposal group held for sale or disposed of.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of equity interests issued or issuable to acquire entity.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of voting equity interests acquired at the acquisition date in the business combination.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net effect on income before taxes of the amortization and accretion of premiums, discounts and intangible assets in the year of acquisition, when the assets of the acquired institution exceed 10 percent of the consolidated assets at the end of the most recent period.
+ References
No definition available.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date.
+ References
No definition available.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the entity's equity method investment which has been sold.
+ References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Area spaced or assigned to productive wells in which a working interest is owned.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Balance held at close of period in number of shares.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sum of the carrying amounts as of the balance sheet date of all investments.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount classified as liabilities attributable to disposal group held for sale or disposed of.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.
+ References
No definition available.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.
+ References
No definition available.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of businesses acquired by the entity during the period.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from the issuance of common limited partners units during the period.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585
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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
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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