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Significant accounting policies, estimates and judgements - Additional information (Details) | 12 Months Ended
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Dec. 31, 2019
Significant accounting policies, estimates and judgements |
Period of capitalisation of costs directly associated with exploration well after drilling is completed | 12 months
Number of days past due for financial asset to be considered in default | 180 days
Recovery rate for exposures arising from intragroup transactions | 100.00%
Minimum |
Significant accounting policies, estimates and judgements |
Term of development projects | 1 year
Maximum |
Significant accounting policies, estimates and judgements |
Term of development projects | 4 years

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