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Segments - Non current assets by country (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Countries
Dec. 31, 2019
USD ($)
Dec. 31, 2018
Disclosure of geographical areas [line items]      
Non-current assets [1] $ 76,082 $ 82,133  
Minimum [member]      
Disclosure of geographical areas [line items]      
Number of countries with operating units | Countries 30    
Norway [member]      
Disclosure of geographical areas [line items]      
Non-current assets $ 42,192 $ 40,292  
Percentage of entity's revenue 80.00% 75.00% 75.00%
USA [member]      
Disclosure of geographical areas [line items]      
Non-current assets $ 13,172 $ 17,776  
Percentage of entity's revenue 14.00% 18.00% 18.00%
Brazil [member]      
Disclosure of geographical areas [line items]      
Non-current assets $ 8,203 $ 8,724  
UK [member]      
Disclosure of geographical areas [line items]      
Non-current assets 4,398 5,657  
Azerbaijan [member]      
Disclosure of geographical areas [line items]      
Non-current assets 1,683 1,598  
Canada [member]      
Disclosure of geographical areas [line items]      
Non-current assets 1,527 1,672  
Russia [member]      
Disclosure of geographical areas [line items]      
Non-current assets 973 447  
Denmark [member]      
Disclosure of geographical areas [line items]      
Non-current assets 953 984  
Algeria [member]      
Disclosure of geographical areas [line items]      
Non-current assets 808 915  
Angola [member]      
Disclosure of geographical areas [line items]      
Non-current assets 725 1,564  
Other countries [Member]      
Disclosure of geographical areas [line items]      
Non-current assets $ 1,447 $ 2,504  
[1]

1) Excluding deferred tax assets, pension assets and non-current financial assets.