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Acquisitions and disposals- Acquisitions (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2020
Bandurria Sur [Member] | SPM Argentina SA [member] |  |  |
Acquisitions [line items] |  |  |
Ownership interest in joint venture | 49.00% |  |
SPM Argentina S.A [Member] | Shell [Member] |  |  |
Acquisitions [line items] |  |  |
Percentage of share acquired | 50.00% |  |
SPM Argentina S.A [Member] | E&P International [member] |  |  |
Acquisitions [line items] |  |  |
Percentage of share acquired | 50.00% |  |
Total purchase price | $ 185 |  |
Bandurria Sur acquisition [Member] | E&P International [member] |  |  |
Acquisitions [line items] |  |  |
Total purchase price |  | $ 44 | $ 44
Bandurria Sur acquisition [Member] | E&P International [member] | Minimum (%) [member] |  |  |
Acquisitions [line items] |  |  |
Ownership interest in joint venture |  | 5.50% |
Bandurria Sur acquisition [Member] | E&P International [member] | Maximum (%) [member] |  |  |
Acquisitions [line items] |  |  |
Ownership interest in joint venture |  |  | 30.00%

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