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Commitments and Contingencies (Details) $ in Millions | 2 Months Ended | 3 Months Ended | 6 Months Ended | 7 Months Ended | 11 Months Ended | 17 Months Ended | 21 Months Ended | 27 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) bbl / d renewal MBbls | Mar. 31, 2018 USD ($) bbl / d renewal MBbls | Mar. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) bbl / d renewal MBbls | Mar. 31, 2018 USD ($) bbl / d renewal MBbls | Dec. 31, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2017 USD ($)
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
MVP Terminal construction costs | $ 40,543 | $ 40,543 |  | $ 40,543 | $ 40,543 |  |  |  |  | $ 40,010
Contributions to MVP |  | 55 | $ 117 |  |  |  |  |  |  |
Cost of undivided interest in pipeline |  | $ 85 | $ 72 |  |  |  |  |  |  |
Terminalling Agreement [Member] | MVP Terminalling, LLC (MVP) [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
Initial term of terminal agreement |  | 12 years |  |  |  |  |  |  |  |
Number of available automatic renewals | renewal | 2 | 2 |  | 2 | 2 |  |  |  |  |
Automatic renewal term of terminalling agreement |  | 5 years |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
Range of possible loss contingency | $ 0 | $ 0 |  | $ 0 | $ 0 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
Range of possible loss contingency | 200 | 200 |  | 200 | 200 |  |  |  |  |
MVP Terminal [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
Contributions to MVP |  | 42 |  |  | 123 |  |  |  |  |
MVP Terminal [Member] | Magellan Midstream Partners LP (Magellan) [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
Long-term liability recorded | 150 | 150 |  | 150 | 150 |  |  |  |  |
MVP Terminal [Member] | Construction in Progress [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
MVP Terminal construction costs | $ 271 | $ 271 |  | $ 271 | $ 271 |  |  |  |  |
MVP Terminal [Member] | Expected [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
Contributions to MVP |  |  |  |  |  |  |  |  | $ 420 |
MVP Terminal [Member] | Expected [Member] | Minimum [Member] | Construction in Progress [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
MVP Terminal construction costs |  |  |  |  |  |  |  |  | 840 |
MVP Terminal [Member] | Expected [Member] | Maximum [Member] | Construction in Progress [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
MVP Terminal construction costs |  |  |  |  |  |  |  |  | $ 1,400 |
Central Texas Pipeline [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
Undivided interest in project (percent) | 40.00% | 40.00% |  | 40.00% | 40.00% |  |  |  |  |
Pipeline capacity (in barrels per day) | bbl / d | 150,000 | 150,000 |  | 150,000 | 150,000 |  |  |  |  |
Cost of undivided interest in pipeline |  | $ 17 |  | $ 24 |  |  |  |  |  |
Central Texas Pipeline [Member] | Expected [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
Cost of undivided interest in pipeline |  |  |  |  |  |  |  | $ 170 |  |
Sunrise Pipeline System [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
Undivided interest in project (percent) | 20.00% | 20.00% |  | 20.00% | 20.00% |  |  |  |  |
Pipeline capacity (in barrels per day) | bbl / d | 500,000 | 500,000 |  | 500,000 | 500,000 |  |  |  |  |
Cost of undivided interest in pipeline | $ 68 |  |  |  |  |  |  |  |  |
Sunrise Pipeline System [Member] | Expected [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
Cost of undivided interest in pipeline |  |  |  |  |  | $ 101 | $ 135 |  |  |
Colorado City Storage Tanks [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
Approximate storage capacity of terminal (in barrels) | MBbls | 270 | 270 |  | 270 | 270 |  |  |  |  |
MVP Terminalling, LLC (MVP) [Member] |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |
Membership percentage in VIE (percent) |  |  |  |  | 50.00% |  |  |  |  |

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