| **Concentration of Risk (Details)**                                                                        | 12 Months Ended      |        |        |        |        |     |
|------------------------------------------------------------------------------------------------------------|----------------------|--------|--------|--------|--------|-----|
||
| **Concentration Risk [Line Items]**                                                                        |                 |   |   |   |   |     |   |  |
| Percentage of crude oil sales (in hundredths)                                                              |                 | 39.00% | 24.00% | 17.00% | 17.00% | [1] | 17.00% | [1] |
| Percentage of total oil, gas & NGL sales (in hundredths)                                               |                 | 31.00% | 16.00% | 11.00% | 14.00% | [1] | 12.00% | [1] |
| **Concentration of credit risk [Abstract]**                                                                |                 |   |   |   |   |     |   |  |
| Short term deposits original maturities at time of purchase, description                                   | three months or less |   |   |   |   |     |   |  |
| Accounts receivables, majority of accounts payment terms, description                                      | 30 days or less |   |   |   |   |     |   |  |
|                                                                                                            |
| [1]Includes sales to both Shell Trading (US) Company and Shell International Trading and Shipping Limited. |

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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For an entity that discloses a concentration risk in relation to crude oil sales, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.
+ References
No definition available.
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| - Definition
For an entity that discloses a concentration risk in relation to total oil and gas sales, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.
+ References
No definition available.
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| - Definition
Further narrative disclosure of claims held for amounts due a company. Examples include trade accounts receivables, notes receivables, loans receivables, etc.
+ References
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| - Definition
Description of the characteristics of contracts treated as deposits for which assets are recorded as of the balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6387650&loc=d3e9420-108338Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 98-7 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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