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Intangible assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year € 3,269 € 3,034
Additions 191 113
Amortization (286) (253)
Net (impairments) reversals 18 389
Write-off (24) (61)
Currency translation differences (141) 38
Other changes (102) 9
Net book amount at the end of the year 2,925 3,269
Intangible Assets With finite Useful Life [Member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 1,949 1,720
Additions 191 113
Amortization (286) (253)
Net (impairments) reversals 18 389
Write-off (24) (61)
Currency translation differences (118) 32
Other changes (9) 9
Net book amount at the end of the year 1,721 1,949
Intangible Assets With finite Useful Life [Member] | Gross carrying amount [member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 8,949  
Net book amount at the end of the year 6,748 8,949
Intangible Assets With finite Useful Life [Member] | Accumulated impairment [member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 7,000  
Net book amount at the end of the year 5,027 7,000
Intangible Assets With Indefinite Useful Life [Member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 1,320 1,314
Currency translation differences (23) 6
Other changes (93)  
Net book amount at the end of the year 1,204 1,320
Intangible Exploration And Evaluation Assets [Member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 1,092 735
Additions 91 15
Amortization (65) (18)
Net (impairments) reversals 18 385
Write-off (24) (61)
Currency translation differences (115) 36
Other changes (2)  
Net book amount at the end of the year 995 1,092
Intangible Exploration And Evaluation Assets [Member] | Gross carrying amount [member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 2,216  
Net book amount at the end of the year 1,504 2,216
Intangible Exploration And Evaluation Assets [Member] | Accumulated impairment [member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 1,124  
Net book amount at the end of the year 509 1,124
Copyrights Patents And Other Industrial Property Rights Service And Operating Rights [Member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 255 363
Additions 5 6
Amortization (110) (113)
Other changes 32 (1)
Net book amount at the end of the year 182 255
Copyrights Patents And Other Industrial Property Rights Service And Operating Rights [Member] | Gross carrying amount [member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 2,462  
Net book amount at the end of the year 2,485 2,462
Copyrights Patents And Other Industrial Property Rights Service And Operating Rights [Member] | Accumulated impairment [member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 2,207  
Net book amount at the end of the year 2,303 2,207
Other concessions, licenses, trademarks and similar items [Member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 259 276
Additions 17 26
Amortization (84) (81)
Currency translation differences (1)  
Other changes 49 38
Net book amount at the end of the year 240 259
Other concessions, licenses, trademarks and similar items [Member] | Gross carrying amount [member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 1,467  
Net book amount at the end of the year 1,466 1,467
Other concessions, licenses, trademarks and similar items [Member] | Accumulated impairment [member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 1,208  
Net book amount at the end of the year 1,226 1,208
Service concession arrangement [Member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 31 32
Additions 1 1
Amortization (2) (2)
Net book amount at the end of the year 30 31
Service concession arrangement [Member] | Gross carrying amount [member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 52  
Net book amount at the end of the year 52 52
Service concession arrangement [Member] | Accumulated impairment [member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 21  
Net book amount at the end of the year 22 21
Service concession arrangement [Member] | Intangible Assets With finite Useful Life [Member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 31 32
Additions 1 1
Amortization (2) (2)
Net book amount at the end of the year 30 31
Intangible Assets Under Development [Member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 148 148
Additions 60 49
Other changes (74) (49)
Net book amount at the end of the year 134 148
Intangible Assets Under Development [Member] | Gross carrying amount [member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 153  
Net book amount at the end of the year 140 153
Intangible Assets Under Development [Member] | Accumulated impairment [member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 5  
Net book amount at the end of the year 6 5
Other Intangible Assets [Member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 164 166
Additions 17 16
Amortization (25) (39)
Net (impairments) reversals   4
Currency translation differences (2) (4)
Other changes (14) 21
Net book amount at the end of the year 140 164
Other Intangible Assets [Member] | Gross carrying amount [member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 2,599  
Net book amount at the end of the year 1,101 2,599
Other Intangible Assets [Member] | Accumulated impairment [member]    
DisclosureOfIntangibleAssetsExplanatoryLineItems [Line Items]    
Net book amount at the beginning of the year 2,435  
Net book amount at the end of the year € 961 € 2,435