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Subsequent event (Details) - Jul. 23, 2020
$ / shares in Units, kr in Billions, $ in Billions
NOK (kr)
USD ($)
$ / shares
Dividends declared [Member]    
Disclosure of non-adjusting events after reporting period [line items]    
Dividends declared   $ 0.09
Settlement of liabilities [Member] | Share buyback programme [Member]    
Disclosure of non-adjusting events after reporting period [line items]    
Repayment of liabilities kr 9.1 $ 0.9