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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