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Intangible assets (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
StatementsLineItems [Line Items] |
Disclosure of detailed information about intangible assets [text block] |
(€ million) |  | Exploration rights |  | Industrial patents and intellectual property rights |  | Concessions, licenses, trademarks and similar items |  | Service concession arrangements |  | Intangible assets in progress and advances |  | Other intangible assets |  | Intangible assets with finite useful lives |  | Intangible assets with indefinite useful lives – Goodwill |  | Total
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net book amount at the beginning of the year |  |  | 1,092 |  |  |  | 255 |  |  |  | 259 |  |  |  | 31 |  |  |  | 148 |  |  |  | 164 |  |  |  | 1,949 |  |  |  | 1,320 |  |  |  | 3,269 |
Additions |  |  | 91 |  |  |  | 5 |  |  |  | 17 |  |  |  | 1 |  |  |  | 60 |  |  |  | 17 |  |  |  | 191 |  |  |  |  |  |  |  | 191 |
Amortization |  |  | (65 | ) |  |  | (110 | ) |  |  | (84 | ) |  |  | (2 | ) |  |  |  |  |  |  | (25 | ) |  |  | (286 | ) |  |  |  |  |  |  | (286 | )
Net (impairments) reversals |  |  | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 |  |  |  |  |  |  |  | 18 |
Write-off |  |  | (24 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (24 | ) |  |  |  |  |  |  | (24 | )
Currency translation differences |  |  | (115 | ) |  |  |  |  |  |  | (1 | ) |  |  |  |  |  |  |  |  |  |  | (2 | ) |  |  | (118 | ) |  |  | (23 | ) |  |  | (141 | )
Other changes |  |  | (2 | ) |  |  | 32 |  |  |  | 49 |  |  |  |  |  |  |  | (74 | ) |  |  | (14 | ) |  |  | (9 | ) |  |  | (93 | ) |  |  | (102 | )
Net book amount at the end of the year |  |  | 995 |  |  |  | 182 |  |  |  | 240 |  |  |  | 30 |  |  |  | 134 |  |  |  | 140 |  |  |  | 1,721 |  |  |  | 1,204 |  |  |  | 2,925 |
Gross book amount at the end of the year |  |  | 1,504 |  |  |  | 2,485 |  |  |  | 1,466 |  |  |  | 52 |  |  |  | 140 |  |  |  | 1,101 |  |  |  | 6,748 |  |  |  |  |  |  |  |  |
Provisions for amortization and impairments |  |  | 509 |  |  |  | 2,303 |  |  |  | 1,226 |  |  |  | 22 |  |  |  | 6 |  |  |  | 961 |  |  |  | 5,027 |  |  |  |  |  |  |  |  |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net book amount at the beginning of the year |  |  | 735 |  |  |  | 363 |  |  |  | 276 |  |  |  | 32 |  |  |  | 148 |  |  |  | 166 |  |  |  | 1,720 |  |  |  | 1,314 |  |  |  | 3,034 |
Additions |  |  | 15 |  |  |  | 6 |  |  |  | 26 |  |  |  | 1 |  |  |  | 49 |  |  |  | 16 |  |  |  | 113 |  |  |  |  |  |  |  | 113 |
Amortization |  |  | (18 | ) |  |  | (113 | ) |  |  | (81 | ) |  |  | (2 | ) |  |  |  |  |  |  | (39 | ) |  |  | (253 | ) |  |  |  |  |  |  | (253 | )
Net (impairments) reversals |  |  | 385 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  | 389 |  |  |  |  |  |  |  | 389 |
Write-off |  |  | (61 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (61 | ) |  |  |  |  |  |  | (61 | )
Currency translation differences |  |  | 36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4 | ) |  |  | 32 |  |  |  | 6 |  |  |  | 38 |
Other changes |  |  |  |  |  |  | (1 | ) |  |  | 38 |  |  |  |  |  |  |  | (49 | ) |  |  | 21 |  |  |  | 9 |  |  |  |  |  |  |  | 9 |
Net book amount at the end of the year |  |  | 1,092 |  |  |  | 255 |  |  |  | 259 |  |  |  | 31 |  |  |  | 148 |  |  |  | 164 |  |  |  | 1,949 |  |  |  | 1,320 |  |  |  | 3,269 |
Gross book amount at the end of the year |  |  | 2,216 |  |  |  | 2,462 |  |  |  | 1,467 |  |  |  | 52 |  |  |  | 153 |  |  |  | 2,599 |  |  |  | 8,949 |  |  |  |  |  |  |  |  |
Provisions for amortization and impairments |  |  | 1,124 |  |  |  | 2,207 |  |  |  | 1,208 |  |  |  | 21 |  |  |  | 5 |  |  |  | 2,435 |  |  |  | 7,000 |  |  |  |  |  |
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 |
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, 2017 |  | December 31, 2016
Gas & Power |  |  | 932 |  |  |  | 1,025 |
Exploration & Production |  |  | 179 |  |  |  | 202 |
Refining & Marketing |  |  | 93 |  |  |  | 93 |
|  |  | 1,204 |  |  |  | 1,320 |
Intangible Exploration And Evaluation Assets [Member] |
StatementsLineItems [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, 2017 |  | December 31, 2016
Proved licence and leasehold property acquisition costs |  |  | 403 |  |  |  | 497 |
Unproved licence and leasehold property acquisition costs |  |  | 586 |  |  |  | 579 |
Other mineral interests |  |  | 6 |  |  |  | 16 |
|  |  | 995 |  |  |  | 1,092 |

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