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Intangible assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year € 2,925 € 3,269
Additions 341 191
Amortization (384) (286)
Reversals (16) 32
Impairments   (14)
Write-off (16) (24)
Currency translation differences 47 (141)
Change through loss of control of subsidiary 120  
Other changes 66 (102)
Net carrying amount at the end of the year 3,170 2,925
Previously stated [Member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 2,925  
Net carrying amount at the end of the year   2,925
Increase (decrease) due to changes in accounting policy [member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Changes in accounting policies (IFRS 9 and 15) 87  
Intangible exploration and evaluation assets [member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 995 1,092
Additions 133 91
Amortization (71) (65)
Reversals   32
Impairments   (14)
Write-off (15) (24)
Currency translation differences 39 (115)
Other changes   (2)
Net carrying amount at the end of the year 1,081 995
Intangible exploration and evaluation assets [member] | Previously stated [Member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 995  
Net carrying amount at the end of the year   995
Copyrights, patents and other industrial property rights, service and operating rights [member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 240 259
Additions 28 17
Amortization (87) (84)
Currency translation differences   (1)
Other changes 40 49
Net carrying amount at the end of the year 221 240
Copyrights, patents and other industrial property rights, service and operating rights [member] | Previously stated [Member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 240  
Net carrying amount at the end of the year   240
Other Intangible Assets [Member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 486 598
Additions 180 83
Amortization (226) (137)
Reversals (16)  
Write-off (1)  
Currency translation differences   (2)
Change through loss of control of subsidiary 74  
Other changes   (56)
Net carrying amount at the end of the year 584 486
Other Intangible Assets [Member] | Previously stated [Member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 486  
Net carrying amount at the end of the year   486
Other Intangible Assets [Member] | Increase (decrease) due to changes in accounting policy [member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Changes in accounting policies (IFRS 9 and 15) 87  
Goodwill [Member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 1,204 1,320
Currency translation differences 8 (23)
Change through loss of control of subsidiary 46  
Other changes 26 (93)
Net carrying amount at the end of the year 1,284 1,204
Goodwill [Member] | Previously stated [Member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 1,204  
Net carrying amount at the end of the year   1,204
Gross carrying amount [member] | Intangible exploration and evaluation assets [member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 1,504  
Net carrying amount at the end of the year 1,686 1,504
Gross carrying amount [member] | Copyrights, patents and other industrial property rights, service and operating rights [member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 1,466  
Net carrying amount at the end of the year 1,534 1,466
Gross carrying amount [member] | Other Intangible Assets [Member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 3,778  
Net carrying amount at the end of the year 4,188 3,778
Accumulated impairment [member] | Intangible exploration and evaluation assets [member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 509  
Net carrying amount at the end of the year 605 509
Accumulated impairment [member] | Copyrights, patents and other industrial property rights, service and operating rights [member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 1,226  
Net carrying amount at the end of the year 1,313 1,226
Accumulated impairment [member] | Other Intangible Assets [Member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 3,292  
Net carrying amount at the end of the year 3,604 3,292
Intangible Assets With Finite Useful Life [Member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 1,721 1,949
Additions 341 191
Amortization (384) (286)
Reversals (16) 32
Impairments   (14)
Write-off (16) (24)
Currency translation differences 39 (118)
Change through loss of control of subsidiary 74  
Other changes 40 (9)
Net carrying amount at the end of the year 1,886 1,721
Intangible Assets With Finite Useful Life [Member] | Previously stated [Member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 1,721  
Net carrying amount at the end of the year   1,721
Intangible Assets With Finite Useful Life [Member] | Increase (decrease) due to changes in accounting policy [member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Changes in accounting policies (IFRS 9 and 15) 87  
Intangible Assets With Finite Useful Life [Member] | Gross carrying amount [member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 6,748  
Net carrying amount at the end of the year 7,408 6,748
Intangible Assets With Finite Useful Life [Member] | Accumulated impairment [member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Net carrying amount – beginning of the year 5,027  
Net carrying amount at the end of the year € 5,522 € 5,027