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Segments - Non current assets by country (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Countries
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disclosure of geographical areas [line items]      
Non-current assets [1] $ 82,133 $ 77,797 $ 74,809
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 $ 40,292 $ 34,952 $ 34,588
Percentage of entity's revenue 75.00% 75.00% 74.00%
USA [member]      
Disclosure of geographical areas [line items]      
Non-current assets $ 17,776 $ 19,409 $ 19,267
Percentage of entity's revenue 18.00% 18.00% 17.00%
Brazil [member]      
Disclosure of geographical areas [line items]      
Non-current assets $ 8,724 $ 7,861 $ 4,584
UK [member]      
Disclosure of geographical areas [line items]      
Non-current assets 5,657 4,588 4,222
Canada [member]      
Disclosure of geographical areas [line items]      
Non-current assets 1,672 1,546 1,715
Azerbaijan [member]      
Disclosure of geographical areas [line items]      
Non-current assets 1,598 1,452 1,472
Angola [member]      
Disclosure of geographical areas [line items]      
Non-current assets 1,564 1,874 2,888
Denmark [member]      
Disclosure of geographical areas [line items]      
Non-current assets 984 407 266
Tanzania [member]      
Disclosure of geographical areas [line items]      
Non-current assets 964 957 960
Algeria [member]      
Disclosure of geographical areas [line items]      
Non-current assets 915 986 1,114
Other countries [Member]      
Disclosure of geographical areas [line items]      
Non-current assets $ 1,986 $ 3,764 $ 3,732
[1]

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