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Derivative financial instruments (Details 1) - Cash flow hedge derivatives [Member]	12 Months Ended
	Dec. 31, 2018 USD ($) bbl
Disclosure Of Derivative Financial Instruments [Line Items]
Nominal Amount of the hedging instrument | bbl	3,599
Change in fair value (effective hedge)	$ 398
Over the Counter [Member]
Disclosure Of Derivative Financial Instruments [Line Items]
Nominal Amount of the hedging instrument | bbl	3,528
Change in fair value (effective hedge)	$ 404
Change in fair value (ineffective hedge)	$ 2
Futures contract [member]
Disclosure Of Derivative Financial Instruments [Line Items]
Nominal Amount of the hedging instrument | bbl	71
Change in fair value (effective hedge)	$ (6)
Change in fair value (ineffective hedge)	$ (2)

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Disclosure of derivative financial instruments

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The gains (losses) recognised in other comprehensive income on cash flow hedges, net of tax. [Refer: Cash flow hedges [member]]

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The gains (losses) on the ineffective portion of cash flow hedges recognised in profit or loss. [Refer: Cash flow hedges [member]]

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The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]]

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