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

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