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Shareholders' equity and dividends - narrative (Details) |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 23, 2020 NOK (kr) | Jul. 23, 2020 USD ($) | May 14, 2020 | Dec. 31, 2020 NOK (kr) $ / shares shares | Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 NOK (kr) shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 shares
Total number of shares issued | shares |  |  |  | 3,257,687,707 |  |  |  | 3,257,687,707 | 3,338,661,219 | 3,338,661,219 |
Dividends declared per share | $ / shares |  |  |  | $ 0.12 |  |  |  |  |  |  |
Increase (decrease) through treasury share transactions, equity |  |  |  |  |  | $ (890,000,000) | $ (500,000,000) |  |  |  |
United States Dollar (USD) [Member] |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  |  | $ 1,163,987,792 |  | $ 1,184,547,766 |
Dividends declared per share | $ / shares |  |  |  |  |  | $ 0.56 | $ 1.04 |  |  |  |
Norwegian kroner (NOK) [Member] |  |  |  |  |  |  |  |  |  |  |
Share capital | kr |  |  |  | $ 8,144,219,267.5 |  |  |  |  | kr 8,346,653,047.5 |  |
Nominal value per share | $ / shares |  |  |  |  |  |  |  | $ 2.5 |  | $ 2.5 |
Treasury shares employees [member] |  |  |  |  |  |  |  |  |  |  |
Treasury shares purchased |  |  |  |  |  | $ 68,000,000 | $ 68,000,000 |  |  |  |
Share buyback programme [member] |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding | shares |  |  |  | 0 |  |  |  | 0 | 23,578,410 | 23,578,410 | 0
Agreement to buy treasury shares |  |  |  |  | $ 5,000,000,000 |  |  |  |  |  |
Short-term obligation settled | kr 9,100,000,000 | $ 900,000,000 |  |  |  |  |  |  |  |  |
Share buyback programme [member] | Norwegian State [Member] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest divested |  |  | 67.00% |  |  |  |  |  |  |  |
Share buyback programme [member] | Share-based Payment Arrangement, Tranche One [member] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) through treasury share transactions, equity |  |  |  |  | (500,000,000) |  |  |  |  |  |
Agreement to buy treasury shares |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |
Share buyback programme [member] | Share Based Payment Arrangement Tranche Two [member] |  |  |  |  |  |  |  |  |  |  |
Cancellation of agreement to buy back shares | kr |  |  |  | $ 675,000,000 |  |  |  |  |  |  |

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