20. Impairment (Details 1) - Property, plant and equipment and intangible assets [member] - Number	Jun. 30, 2020	Dec. 31, 2019
Disclosure of information for individual asset or cash-generating unit with significant amount of property plant and equipment and intangible assets [line items]
Average Brent (US$/bbl)	50.00%	65.00%
Average Brazilian Real (excluding inflation ) - Real /U.S. dollar exchange rate	4	4
2020 [member]
Disclosure of information for individual asset or cash-generating unit with significant amount of property plant and equipment and intangible assets [line items]
Average Brent (US$/bbl)		65.00%
Average Brazilian Real (excluding inflation ) - Real /U.S. dollar exchange rate		4
2021 [member]
Disclosure of information for individual asset or cash-generating unit with significant amount of property plant and equipment and intangible assets [line items]
Average Brent (US$/bbl)	25.00%	65.00%
Average Brazilian Real (excluding inflation ) - Real /U.S. dollar exchange rate	5	4
2022 [member]
Disclosure of information for individual asset or cash-generating unit with significant amount of property plant and equipment and intangible assets [line items]
Average Brent (US$/bbl)	30.00%	65.00%
Average Brazilian Real (excluding inflation ) - Real /U.S. dollar exchange rate	5	4
2023 [member]
Disclosure of information for individual asset or cash-generating unit with significant amount of property plant and equipment and intangible assets [line items]
Average Brent (US$/bbl)		65.00%
Average Brazilian Real (excluding inflation ) - Real /U.S. dollar exchange rate		4
2024 [member]
Disclosure of information for individual asset or cash-generating unit with significant amount of property plant and equipment and intangible assets [line items]
Average Brent (US$/bbl)	40.00%	65.00%
Average Brazilian Real (excluding inflation ) - Real /U.S. dollar exchange rate	4	4
2023 [member]
Disclosure of information for individual asset or cash-generating unit with significant amount of property plant and equipment and intangible assets [line items]
Average Brent (US$/bbl)	35.00%
Average Brazilian Real (excluding inflation ) - Real /U.S. dollar exchange rate	5
2025 [member]
Disclosure of information for individual asset or cash-generating unit with significant amount of property plant and equipment and intangible assets [line items]
Average Brent (US$/bbl)	45.00%
Average Brazilian Real (excluding inflation ) - Real /U.S. dollar exchange rate	4

The amount by which value that has been assigned to a key assumption must change in order for a unit's recoverable amount to be equal to its carrying amount. [Refer: Carrying amount [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2020-01-01
-Paragraph 134
-Subparagraph f
-Clause iii
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-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2020-01-01
-Paragraph 135
-Subparagraph e
-Clause iii
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- Definition

The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2020-01-01
-Paragraph 134
-Subparagraph d
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_134_d_iv&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ References

No definition available.

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