Rosebank Acquisition (Details) - Rosebank project $ in Millions	Oct. 06, 2016 USD ($)
Rosebank Acquisition
Interest purchased (as a percent)	30.00%
Consideration paid	$ 50
Contingent liabilities related to joint ventures
Rosebank Acquisition
Contingent liability	$ 165

The fair value, at acquisition date, of cash transferred as consideration in a business combination. [Refer: Business combinations [member]]

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The amount of contingent liabilities recognised as of the acquisition date in a business combination. [Refer: Contingent liabilities [member]; Business combinations [member]]

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The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]]

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