Critical Judgments and Accounting Estimates - Narrative (Details) - Oil and natural gas reserves [member]	Dec. 31, 2019
Egypt [member]
Average Sales Prices of Oil and Gas [Line Items]
Discount rate used in current measurement of fair value less costs of disposal	15.00%
Canada [member]
Average Sales Prices of Oil and Gas [Line Items]
Discount rate used in current measurement of fair value less costs of disposal	10.00%

The discount rate used in the current measurement of fair value less costs of disposal.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2019-01-01
-Paragraph 130
-Subparagraph f
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_130_f_iii&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_DiscountRateUsedInCurrentMeasurementOfFairValueLessCostsOfDisposal
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant