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Intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Intangible Assets Explanatory [Line Items] |
Disclosure of detailed information about intangible assets [text block] |
(€ million) |  | Exploration rights |  |  | Industrial patents and intellectual property rights |  |  | Other intangible assets |  |  | Intangible assets with finite useful lives |  |  | Goodwill |  |  | Total |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount – beginning of the year |  |  | 995 |  |  |  | 240 |  |  |  | 486 |  |  |  | 1,721 |  |  |  | 1,204 |  |  |  | 2,925 |
Changes in accounting policies (IFRS 9 and 15) |  |  |  |  |  |  |  |  |  |  | 87 |  |  |  | 87 |  |  |  |  |  |  |  | 87 |
Net carrying amount restated – beginning of the year |  |  | 995 |  |  |  | 240 |  |  |  | 573 |  |  |  | 1,808 |  |  |  | 1,204 |  |  |  | 3,012 |
Additions |  |  | 133 |  |  |  | 28 |  |  |  | 180 |  |  |  | 341 |  |  |  |  |  |  |  | 341 |
Amortization |  |  | (71 | ) |  |  | (87 | ) |  |  | (226 | ) |  |  | (384 | ) |  |  |  |  |  |  | (384 | )
Impairments |  |  |  |  |  |  |  |  |  |  | (16 | ) |  |  | (16 | ) |  |  |  |  |  |  | (16 | )
Write-off |  |  | (15 | ) |  |  |  |  |  |  | (1 | ) |  |  | (16 | ) |  |  |  |  |  |  | (16 | )
Currency translation differences |  |  | 39 |  |  |  |  |  |  |  |  |  |  |  | 39 |  |  |  | 8 |  |  |  | 47 |
Change through loss of control of subsidiary |  |  |  |  |  |  |  |  |  |  | 74 |  |  |  | 74 |  |  |  | 46 |  |  |  | 120 |
Other changes |  |  |  |  |  |  | 40 |  |  |  |  |  |  |  | 40 |  |  |  | 26 |  |  |  | 66 |
Net carrying a mount at the end of the year |  |  | 1,081 |  |  |  | 221 |  |  |  | 584 |  |  |  | 1,886 |  |  |  | 1,284 |  |  |  | 3,170 |
Gross carrying amount at the end of the year |  |  | 1,686 |  |  |  | 1,534 |  |  |  | 4,188 |  |  |  | 7,408 |  |  |  |  |  |  |  |  |
Provisions for amortization and impairment |  |  | 605 |  |  |  | 1,313 |  |  |  | 3,604 |  |  |  | 5,522 |  |  |  |  |  |  |  |  |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying a mount – beginning of the year |  |  | 1,092 |  |  |  | 259 |  |  |  | 598 |  |  |  | 1,949 |  |  |  | 1,320 |  |  |  | 3,269 |
Additions |  |  | 91 |  |  |  | 17 |  |  |  | 83 |  |  |  | 191 |  |  |  |  |  |  |  | 191 |
Amortization |  |  | (65 | ) |  |  | (84 | ) |  |  | (137 | ) |  |  | (286 | ) |  |  |  |  |  |  | (286 | )
Reversals |  |  | 32 |  |  |  |  |  |  |  |  |  |  |  | 32 |  |  |  |  |  |  |  | 32 |
Impairments |  |  | (14 | ) |  |  |  |  |  |  |  |  |  |  | (14 | ) |  |  |  |  |  |  | (14 | )
Write-off |  |  | (24 | ) |  |  |  |  |  |  |  |  |  |  | (24 | ) |  |  |  |  |  |  | (24 | )
Currency translation differences |  |  | (115 | ) |  |  | (1 | ) |  |  | (2 | ) |  |  | (118 | ) |  |  | (23 | ) |  |  | (141 | )
Other changes |  |  | (2 | ) |  |  | 49 |  |  |  | (56 | ) |  |  | (9 | ) |  |  | (93 | ) |  |  | (102 | )
Net carrying amount – end of the year |  |  | 995 |  |  |  | 240 |  |  |  | 486 |  |  |  | 1,721 |  |  |  | 1,204 |  |  |  | 2,925 |
Gross carrying amount – end of the year |  |  | 1,504 |  |  |  | 1,466 |  |  |  | 3,778 |  |  |  | 6,748 |  |  |  |  |  |  |  |  |
Provisions for amortization and impairment |  |  | 509 |  |  |  | 1,226 |  |  |  | 3,292 |  |  |  | 5,027 |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Amortization Rates [text block] | The main amortization rates used were substantially unchanged from the previous year and ranged as follows:
(%) |  |
Exploration rights |  |  |  |  | UOP – 33 |  |
Transport rights of natural gas |  |  |  |  | 3 |  |
Other concessions, licenses, trademarks and similar items |  |  |  |  | 3 – 33 |  |
Service concession arrangements |  |  |  |  | 20 – 33 |  |
Capitalized costs for customer acquisition |  |  |  |  | 25 – 33 |  |
Other intangible assets |  |  |  |  | 4 – 20 |  |
Disclosure of goodwill [text block] | A breakdown of the stated goodwill by operating segment is provided below:
(€ million) |  | December 31, 2018 |  | December 31, 2017
Gas & Power |  |  | 977 |  |  |  | 932 |
Exploration & Production |  |  | 187 |  |  |  | 179 |
Refining & Marketing |  |  | 119 |  |  |  | 93 |
Other activities |  |  | 1 |  |  |  |  |
|  |  | 1,284 |  |  |  | 1,204 |
Disclosure of goodwill outstanding relate with Gas power [Table Text Block] | The amount of goodwill outstanding at the reporting date mainly related to the Gas & Power segment. A breakdown is disclosed below.
(€ million) |  | December 31, 2018 |  | December 31, 2017
Domestic gas market |  |  | 835 |  |  |  | 835 |
European gas market |  |  | 142 |  |  |  | 97 |
|  |  | 977 |  |  |  | 932 |
Intangible exploration and evaluation assets [member] |
Disclosure Of Intangible Assets Explanatory [Line Items] |
Disclosure of detailed information about intangible assets [text block] | The breakdown of exploration rights by type of asset was as follows:
(€ million) |  | December 31, 2018 |  | December 31, 2017
Proved licence and leasehold property acquisition costs |  |  | 357 |  |  |  | 403 |
Unproved licence and leasehold property acquisition costs |  |  | 684 |  |  |  | 586 |
Other mineral interests |  |  | 40 |  |  |  | 6 |
|  |  | 1,081 |  |  |  | 995 |

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