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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

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