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Taxation - Earliest Open Tax Year (Details) | 12 Months Ended
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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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- 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 + Details
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