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Taxation - Earliest Open Tax Year (Details)	12 Months Ended
	Dec. 31, 2020
Angola
Income Tax Examination [Line Items]
Earliest Open Year	2015
Nigeria
Income Tax Examination [Line Items]
Earliest Open Year	2014
United States
Income Tax Examination [Line Items]
Earliest Open Year	2016
Norway
Income Tax Examination [Line Items]
Earliest Open Year	2016
Brazil
Income Tax Examination [Line Items]
Earliest Open Year	2008

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Tax year that remains open to examination under enacted tax laws, in CCYY format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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