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Revenues and other income - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of additional information |  |  |
Gain on sale of assets and businesses | € 152 | € 454 | € 3,288
Recovery of cost share of right-of-use assets pertaining to partners of non-incorporated joint operations | 368 |  |
Zohr project |  |  |
Disclosure of additional information |  |  |
Gain on sale of assets and businesses |  | € 428 | € 1,281
Proportion of ownership interest sold |  | 10.00% | 40.00%
Area 4 Mozambique |  |  |
Disclosure of additional information |  |  |
Gain on sale of assets and businesses |  |  | € 1,985
Proportion of ownership interest sold |  |  | 25.00%
Exploration & Production |  |  |
Disclosure of additional information |  |  |
Gain on sale of assets and businesses | € 146 |  |

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