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Shareholders' equity and dividends - narrative (Details) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 08, 2022 USD ($) $ / shares $ / bbl | Sep. 08, 2021 USD ($) | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2021 NOK (kr) shares | Dec. 31, 2021 USD ($) $ / shares shares | Oct. 31, 2021 USD ($) | Jul. 31, 2021 USD ($) | Dec. 31, 2020 NOK (kr) shares | Dec. 31, 2020 USD ($) $ / shares shares
Total number of shares issued | shares |  |  |  |  |  | 3,257,687,707 | 3,257,687,707 |  |  | 3,257,687,707 | 3,257,687,707
Dividends declared per share | $ / shares |  |  | $ 0.6300 | $ 0.5600 |  |  |  |  |  |  |
Increase (decrease) through treasury share transactions, equity |  |  | $ (429,000,000) | $ (890,000,000) | $ (500,000,000) |  |  |  |  |  |
Proposal of dividend declaration [member] |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share | $ / shares | $ 0.20 |  |  |  |  |  |  |  |  |  |
Extraordinary dividend per share | $ / shares | $ 0.20 |  |  |  |  |  |  |  |  |  |
Minimum [member] | Share buy-back programme 2022 [member] |  |  |  |  |  |  |  |  |  |  |
Percent of debt to capital employed | 15.00% |  |  |  |  |  |  |  |  |  |
Minimum [member] | Share buy-back programme 2022 [member] | Brent Blend oil price [member] |  |  |  |  |  |  |  |  |  |  |
Estimated crude oil or Gas price per unit | $ / bbl | 50 |  |  |  |  |  |  |  |  |  |
Maximum [member] | Share buy-back programme 2022 [member] |  |  |  |  |  |  |  |  |  |  |
Percent of debt to capital employed | 30.00% |  |  |  |  |  |  |  |  |  |
Maximum [member] | Share buy-back programme 2022 [member] | Brent Blend oil price [member] |  |  |  |  |  |  |  |  |  |  |
Estimated crude oil or Gas price per unit | $ / bbl | 60 |  |  |  |  |  |  |  |  |  |
Norwegian State [Member] | Share buy-back programme 2022 [member] |  |  |  |  |  |  |  |  |  |  |
Agreement to buy treasury shares | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |
Norwegian State [Member] | Maximum [member] | Share buy-back programme 2022 [member] |  |  |  |  |  |  |  |  |  |  |
Agreement to buy treasury shares | $ 5,000,000,000.0 |  |  |  |  |  |  |  |  |  |
United States Dollar (USD) [Member] |  |  |  |  |  |  |  |  |  |  |
Share capital |  |  |  |  |  |  | $ 1,163,987,792 |  |  |  | $ 1,163,987,792
Norwegian kroner (NOK) [Member] |  |  |  |  |  |  |  |  |  |  |
Share capital | kr |  |  |  |  |  | kr 8,144,219,267.50 |  |  |  | kr 8,144,219,267.50 |
Nominal value per share | $ / shares |  |  |  |  |  |  | $ 2.50 |  |  |  | $ 2.50
Treasury shares employees [member] |  |  |  |  |  |  |  |  |  |  |
Treasury shares purchased |  |  | 75,000,000 | $ 68,000,000 |  |  |  |  |  |  |
Share buyback programme [member] |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding | shares |  |  |  |  | 23,578,410 | 13,460,292 | 13,460,292 |  |  | 0 | 0
Share buyback programme [member] | Third Party [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) through treasury share transactions, equity |  |  | $ 429,000,000 |  |  |  |  |  |  |  |
Share buyback programme [member] | Share-based Payment Arrangement, Tranche One [member] |  |  |  |  |  |  |  |  |  |  |
Agreement to buy treasury shares |  |  |  |  |  |  | $ 600,000,000 |  | $ 300,000,000 |  |
Share buyback programme [member] | Share-based Payment Arrangement, Tranche One [member] | Norwegian State [Member] |  |  |  |  |  |  |  |  |  |  |
Agreement to buy treasury shares |  |  |  |  |  |  |  | $ 201,000,000 |  |  |
Share buyback programme [member] | Share-based Payment Arrangement, Tranche One [member] | Third Party [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury shares purchased |  | $ 99,000,000 |  |  |  |  |  |  |  |  |
Share buyback programme [member] | Share-based Payment Arrangement, Tranche One [member] | Third Party [Member] | Maximum [member] |  |  |  |  |  |  |  |  |  |  |
Agreement to buy treasury shares |  |  |  |  |  |  |  | 99,000,000 |  |  |
Share buyback programme [member] | Share Based Payment Arrangement Tranche Two [member] | Minimum [member] |  |  |  |  |  |  |  |  |  |  |
Agreement to buy treasury shares |  |  |  |  |  |  |  | 300,000,000 |  |  |
Share buyback programme [member] | Share Based Payment Arrangement Tranche Two [member] | Maximum [member] |  |  |  |  |  |  |  |  |  |  |
Agreement to buy treasury shares |  |  |  |  |  |  |  | 1,000,000,000.0 |  |  |
Share buyback programme [member] | Share Based Payment Arrangement Tranche Two [member] | Norwegian State [Member] |  |  |  |  |  |  |  |  |  |  |
Agreement to buy treasury shares |  |  |  |  |  |  |  | 670,000,000 |  |  |
Share buyback programme [member] | Share Based Payment Arrangement Tranche Two [member] | Third Party [Member] |  |  |  |  |  |  |  |  |  |  |
Treasury shares purchased |  | 232,000,000 |  |  |  |  |  |  |  |  |
Short-term obligation settled |  | 222,000,000 |  |  |  |  |  |  |  |  |
Share buyback programme [member] | Share Based Payment Arrangement Tranche Two [member] | Third Party [Member] | Maximum [member] |  |  |  |  |  |  |  |  |  |  |
Agreement to buy treasury shares |  | $ 330,000,000 |  |  |  |  |  | $ 330,000,000 |  |  |

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