| **Concentration of Risk (Details)**                                                                        | 12 Months Ended      |        |        |        |        |     |        |
|------------------------------------------------------------------------------------------------------------|----------------------|--------|--------|--------|--------|-----|--------|
||
| **Concentration Risk [Line Items]**                                                                        |                 |   |   |   |   |     |   |  |   |  |
| Percentage of crude oil sales (in hundredths)                                                              |                 | 34.00% | 39.00% | 24.00% | 17.00% | [1] | 17.00% | [1] | 17.00% | [1] |
| Percentage of total oil, gas & NGL sales (in hundredths)                                               |                 | 25.00% | 31.00% | 16.00% | 13.00% | [1] | 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
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