| Standard label: | Exploration Abandonment and Impairment Expense |
| Name: | us-gaap:ExplorationAbandonmentAndImpairmentExpense |
| Documentation: | The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ExplorationAbandonmentAndImpairmentExpense |
| Label | Role | Language |
| Exploration Abandonment and Impairment Expense | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 28 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 230 |
| FASB Accounting Standards Codification 932 360 40 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 932 |
| FASB Accounting Standards Codification 932 360 40 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 932 |
| FASB Accounting Standards Codification 932 360 40 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 932 |
| FASB Accounting Standards Codification 932 360 35 11 | http://fasb.org/us-gaap/role/ref/legacyRef | 932 |
| Part Of Roll Up: |
| us-gaap:TangibleAssetImpairmentCharges |