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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure Of Property Plant And Equipment Explanatory [Abstract]  
Disclosure of detailed information about property, plant and equipment [text block]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Other tangible
 
 
 
 
 
 
 
 
 
E&P wells,
 
 
 
 
 
E&P exploration
 
 
E&P tangible
 
 
assets in
 
 
 
 
 
 
Land and
 
 
plant and
 
 
Other plant
 
 
assets and
 
 
assets in
 
 
progress and
 
 
 
 
(€ million)
 
buildings
 
 
machinery
 
 
and machinery
 
 
appraisal
 
 
progress
 
 
advances
 
 
Total
 
2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net
carrying
amount – beginning of the year
 
 
1,313
 
 
 
45,782
 
 
 
3,877
 
 
 
1,371
 
 
 
9,469
 
 
 
1,346
 
 
 
63,158
 
Additions
 
 
18
 
 
 
432
 
 
 
173
 
 
 
330
 
 
 
6,947
 
 
 
878
 
 
 
8,778
 
Depreciation
 
 
(65
)
 
 
(6,012
)
 
 
(529
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(6,606
)
Reversals
 
 
41
 
 
 
299
 
 
 
86
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
426
 
Impairments
 
 
(61
)
 
 
(477
)
 
 
(73
)
 
 
 
 
 
 
(548
)
 
 
(117
)
 
 
(1,276
)
Write-off
 
 
 
 
 
 
(12
)
 
 
(1
)
 
 
(66
)
 
 
(4
)
 
 
(1
)
 
 
(84
)
Disposals
 
 
(2
)
 
 
(400
)
 
 
(9
)
 
 
(32
)
 
 
(198
)
 
 
2
 
 
 
(639
)
Currency translation differences
 
 
2
 
 
 
1,623
 
 
 
36
 
 
 
53
 
 
 
385
 
 
 
(1
)
 
 
2,098
 
Decrease through loss of control of subsidiary
 
 
1
 
 
 
(4,388
)
 
 
32
 
 
 
(58
)
 
 
(474
)
 
 
10
 
 
 
(4,877
)
Transfers
 
 
81
 
 
 
6,795
 
 
 
461
 
 
 
(294
)
 
 
(6,501
)
 
 
(542
)
 
 
 
 
Other changes
 
 
(54
)
 
 
(786
)
 
 
(152
)
 
 
(37
)
 
 
119
 
 
 
234
 
 
 
(676
)
Net
carrying
amount – end of the year
 
 
1,274
 
 
 
42,856
 
 
 
3,901
 
 
 
1,267
 
 
 
9,195
 
 
 
1,809
 
 
 
60,302
 
Gross
carrying 
amount – end of the year
 
 
4,060
 
 
 
135,467
 
 
 
27,516
 
 
 
1,267
 
 
 
12,559
 
 
 
2,415
 
 
 
183,284
 
Provisions for depreciation and impairments
 
 
2,786
 
 
 
92,611
 
 
 
23,615
 
 
 
 
 
 
 
3,364
 
 
 
606
 
 
 
122,982
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net carrying amount – beginning of the year
 
 
1,258
 
 
 
47,090
 
 
 
3,789
 
 
 
1,905
 
 
 
15,135
 
 
 
1,616
 
 
 
70,793
 
Additions
 
 
22
 
 
 
42
 
 
 
190
 
 
 
351
 
 
 
7,302
 
 
 
583
 
 
 
8,490
 
Depreciation
 
 
(71
)
 
 
(6,583
)
 
 
(545
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(7,199
)
Reversals
 
 
5
 
 
 
608
 
 
 
273
 
 
 
 
 
 
 
169
 
 
 
 
 
 
 
1,055
 
Impairments
 
 
(2
)
 
 
(491
)
 
 
(83
)
 
 
 
 
 
 
(146
)
 
 
(126
)
 
 
(848
)
Write-off
 
 
 
 
 
 
(3
)
 
 
(2
)
 
 
(232
)
 
 
(2
)
 
 
 
 
 
 
(239
)
Disposals
 
 
(15
)
 
 
3
 
 
 
(6
)
 
 
 
 
 
 
(1,376
)
 
 
(54
)
 
 
(1,448
)
Currency translation differences
 
 
(5
)
 
 
(5,155
)
 
 
(143
)
 
 
(193
)
 
 
(1,527
)
 
 
(2
)
 
 
(7,025
)
Transfers
 
 
84
 
 
 
9,940
 
 
 
629
 
 
 
(265
)
 
 
(9,673
)
 
 
(715
)
 
 
 
 
Other changes
 
 
37
 
 
 
331
 
 
 
(225
)
 
 
(195
)
 
 
(413
)
 
 
44
 
 
 
(421
)
Net
carrying
 
amount – end of the year
 
 
1,313
 
 
 
45,782
 
 
 
3,877
 
 
 
1,371
 
 
 
9,469
 
 
 
1,346
 
 
 
63,158
 
Gross
carrying
amount – end of the year
 
 
4,061
 
 
 
137,223
 
 
 
26,746
 
 
 
1,371
 
 
 
12,315
 
 
 
2,061
 
 
 
183,777
 
Provisions for depreciation and impairments
 
 
2,748
 
 
 
91,441
 
 
 
22,869
 
 
 
 
 
 
 
2,846
 
 
 
715
 
 
 
120,619
 
 
Disclosure Of Detailed Information About Depreciation Rates [text block]
The main depreciation rates used were substantially unchanged from the previous year and ranged as
follows:
(%)
 
 
 
Buildings
 
2
 – 
10
 
Mineral exploration wells and plants
 
UOP
 
Refining and chemical plants
 
2 
– 
17
 
Gas pipelines and compression stations
 
2
 – 
12
 
Power plants
 
5
 
Other plant and machinery
 
6
 – 
12
 
Industrial and commercial equipment
 
5
 – 
25
 
Other assets
 
10
 – 
20
 
Disclosure of detailed information about stratification of the suspended wells pending final determination of proved reserves aging [text block]
 
(€ million)
  
2018
  
2017
  
2016
 
Costs for exploratory wells suspended – beginning of the period
    
1,263
     
1,684
     
1,737
  
Increases for which is ongoing the determination of proved reserves
    
235
     
451
     
282
  
Amounts previously capitalized and expensed in the period
    
(61)
     
(217)
     
(109)
  
Reclassification to successful exploratory wells following the estimation of proved reserves
    
(297)
     
(278)
     
(276)
  
Disposals
    
(6)
     
(199)
        
Decrease through loss of control of subsidiary
    
(58)
              
Reclassification to assets held for sale
    
(24)
              
Currency translation differences
    
49
     
(178)
     
50
  
Costs for exploratory wells suspended – end of the period
    
1,101
     
1,263
     
1,684
  
 
The following information relates to the stratification of the suspended wells pending final determination (ageing):
 
   
2018
  
2017
  
2016
 
   
(€ million)
  
(number of 
wells in Eni’s 
interest)
  
(€ million)
  
(number of 
wells in Eni’s 
interest)
  
(€ million)
  
(number of 
wells in Eni’s 
interest)
 
Costs capitalized and suspended for 
exploratory well activity
                                     
- within 1 year
    
111
     
7.02
     
222
     
7.95
     
16
     
1.05
  
- between 1 and 3 years
    
87
     
2.88
     
241
     
3.87
     
609
     
10.25
  
- beyond 3 years
    
903
     
24.20
     
800
     
21.44
     
1,059
     
21.55
  
     
1,101
     
34.10
     
1,263
     
33.26
     
1,684
     
32.85
  
Costs capitalized for suspended wells
                                     
- fields including wells drilled over the last 12 months
    
111
     
7.02
     
148
     
5.88
     
9
     
0.55
  
- fields for which the delineation campaign is in progress
    
217
     
4.66
     
261
     
4.69
     
251
     
3.51
  
- fields including commercial discoveries that proceeds to sanctioning
    
773
     
22.42
     
854
     
22.69
     
1,424
     
28.79
  
 
 
 
 
 
1,101
 
 
 
 
 
34.10
 
 
 
 
 
1,263
 
 
 
 
 
33.26
 
 
 
 
 
1,684
 
 
 
 
 
32.85
 
 
Disclosure Of Detailed Information About Unproved Mineral Interests [text block]
Unproved mineral interests include the purchase price allocated to unproved reserves following business combinations or acquisition of individual properties. Unproved mineral interests were as follows:
 
(€ million)
  
Congo
  
Nigeria
  
Turkmenistan
  
USA
  
Algeria
  
Egypt
  
United Arab 
Emirates
  
Total
 
2018
                                                 
Book amount at the beginning of the year
    
1,162
     
825
     
192
     
99
     
105
     
7
           
2,390
  
Additions
    
26
     
56
                       
23
     
487
     
592
  
Net (impairments) reversals
    
(429)
           
(76)
                             
(505)
  
Reclassification to proved mineral interest
    
(32)
           
(44)
           
(32)
     
(2)
           
(110)
  
Other changes and currency translation differences
    
42
     
40
     
5
     
4
     
4
     
1
     
15
     
111
  
Book amount at the end of the year
    
769
     
921
     
77
     
103
     
77
     
29
     
502
     
2,478
  
2017
                                                 
Book amount at the beginning of the year
    
1,254
     
938
     
138
     
113
           
7
           
2,450
  
Additions
                            
112
                 
112
  
Net (impairments) reversals
    
72
           
75
                             
147
  
Reclassification to proved mineral interest
    
(7)
                                         
(7)
  
Other changes and currency translation differences
    
(157)
     
(113)
     
(21)
     
(14)
     
(7)
                 
(312)
  
Book amount at the end of the year
    
1,162
     
825
     
192
     
99
     
105
     
7
           
2,390