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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

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