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Segments - Non current assets by country (Details) $ in Millions | 12 Months Ended
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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.

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