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Impairment/reversal of tangible and intangible assets (Tables)
 12 Months Ended
Dec. 31, 2017
StatementsLineItems [Line Items]  
Disclosure of impairment loss and reversal of impairment loss [text block]
(€ million)   2017   2016
Impairment losses                
Tangible assets     (848 )     (1,067 )
Intangible assets     (14 )        
      (862 )     (1,067 )
less:                
- reversal of tangible assets     1,055       1,153  
- reversal of intangible assets     32       389  
      225       475  
Disclosure of detailed information about impairments losses and the associated tax effect [text block]

A breakdown by segment of impairments of tangible assets recorded and the associated tax effect is provided below:

(€ million)   2017   2016
Impairments                
Exploration & Production     (636 )     (740 )
Gas & Power     (56 )     (167 )
Refining & Marketing and Chemical     (131 )     (120 )
Corporate and other activities     (25 )     (40 )
      (848 )     (1,067 )
Tax effects                
Exploration & Production     91       216  
Gas & Power     12       35  
Refining & Marketing and Chemical     35       32  
Corporate and other activities     6          
      144       283  
Impairments net of the relevant tax effects                
Exploration & Production     (545 )     (524 )
Gas & Power     (44 )     (132 )
Refining & Marketing and Chemical     (96 )     (88 )
Corporate and other activities     (19 )     (40 )
      (704 )     (784 )

 

A breakdown by segment of reversals of tangible assets recorded and the associated tax effect is provided below:

(€ million)   2017   2016
Reversals                
Exploration & Production     776       1,055  
Gas & Power     202       86  
Refining & Marketing and Chemical     77       12  
      1,055       1,153  
Tax effects                
Exploration & Production     (171 )     (315 )
Gas & Power     (5 )     (28 )
Refining & Marketing and Chemical     (24 )     (3 )
      (200 )     (346 )
Reversals net of the relevant tax effects                
Exploration & Production     605       740  
Gas & Power     197       58  
Refining & Marketing and Chemical     53       9  
      855       807  
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  
Gas & Power Segment [Member]  
StatementsLineItems [Line Items]  
Disclosure of goodwill [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, 2017   December 31, 2016
Domestic gas market     835       835  
Foreign gas market     97       190  
- of which European market     95       188  
      932       1,025