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Intangible assets (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Intangible assets |  |
Net carrying amount - beginning of the year | € 3,170 | € 2,925
Additions | 311 | 341
Amortization | (291) | (384)
Impairments | (117) | (16)
Write-off | (30) | (16)
Currency translation differences | 22 | 47
Change in the scope of consolidation |  | 120
Other changes | (6) | 66
Net carrying amount at the end of the year | 3,059 | 3,170
Changes in accounting policies (IFRS 15) |  |
Intangible assets |  |
Net carrying amount - beginning of the year |  | 87
After initial application |  |
Intangible assets |  |
Net carrying amount - beginning of the year |  | 3,012
Intangible assets with finite useful lives |  |
Intangible assets |  |
Net carrying amount - beginning of the year | 1,886 | 1,721
Additions | 311 | 341
Amortization | (291) | (384)
Impairments | (91) | (16)
Write-off | (30) | (16)
Currency translation differences | 19 | 39
Change in the scope of consolidation |  | 74
Other changes | (10) | 40
Net carrying amount at the end of the year | 1,794 | 1,886
Intangible assets with finite useful lives | Changes in accounting policies (IFRS 15) |  |
Intangible assets |  |
Net carrying amount - beginning of the year |  | 87
Intangible assets with finite useful lives | After initial application |  |
Intangible assets |  |
Net carrying amount - beginning of the year |  | 1,808
Exploration rights |  |
Intangible assets |  |
Net carrying amount - beginning of the year | 1,081 | 995
Additions | 78 | 133
Amortization | (81) | (71)
Impairments | (19) |
Write-off | (28) | (15)
Currency translation differences | 18 | 39
Other changes | (18) |
Net carrying amount at the end of the year | 1,031 | 1,081
Exploration rights | After initial application |  |
Intangible assets |  |
Net carrying amount - beginning of the year |  | 995
Industrial patents and intellectual property rights |  |
Intangible assets |  |
Net carrying amount - beginning of the year | 221 | 240
Additions | 23 | 28
Amortization | (93) | (87)
Write-off | (1) |
Other changes | 45 | 40
Net carrying amount at the end of the year | 195 | 221
Industrial patents and intellectual property rights | After initial application |  |
Intangible assets |  |
Net carrying amount - beginning of the year |  | 240
Other intangible assets |  |
Intangible assets |  |
Net carrying amount - beginning of the year | 584 | 486
Additions | 210 | 180
Amortization | (117) | (226)
Impairments | (72) | (16)
Write-off | (1) | (1)
Currency translation differences | 1 |
Change in the scope of consolidation |  | 74
Other changes | (37) |
Net carrying amount at the end of the year | 568 | 584
Other intangible assets | Changes in accounting policies (IFRS 15) |  |
Intangible assets |  |
Net carrying amount - beginning of the year |  | 87
Other intangible assets | After initial application |  |
Intangible assets |  |
Net carrying amount - beginning of the year |  | 573
Goodwill |  |
Intangible assets |  |
Net carrying amount - beginning of the year | 1,284 | 1,204
Impairments | (26) |
Currency translation differences | 3 | 8
Change in the scope of consolidation |  | 46
Other changes | 4 | 26
Net carrying amount at the end of the year | 1,265 | 1,284
Goodwill | After initial application |  |
Intangible assets |  |
Net carrying amount - beginning of the year |  | 1,204
Gross carrying amount | Intangible assets with finite useful lives |  |
Intangible assets |  |
Net carrying amount - beginning of the year | 7,408 |
Net carrying amount at the end of the year | 7,718 | 7,408
Gross carrying amount | Exploration rights |  |
Intangible assets |  |
Net carrying amount - beginning of the year | 1,686 |
Net carrying amount at the end of the year | 1,748 | 1,686
Gross carrying amount | Industrial patents and intellectual property rights |  |
Intangible assets |  |
Net carrying amount - beginning of the year | 1,534 |
Net carrying amount at the end of the year | 1,597 | 1,534
Gross carrying amount | Other intangible assets |  |
Intangible assets |  |
Net carrying amount - beginning of the year | 4,188 |
Net carrying amount at the end of the year | 4,373 | 4,188
Accumulated depreciation, amortisation and impairment | Intangible assets with finite useful lives |  |
Intangible assets |  |
Net carrying amount - beginning of the year | (5,522) |
Net carrying amount at the end of the year | (5,924) | (5,522)
Accumulated depreciation, amortisation and impairment | Exploration rights |  |
Intangible assets |  |
Net carrying amount - beginning of the year | (605) |
Net carrying amount at the end of the year | (717) | (605)
Accumulated depreciation, amortisation and impairment | Industrial patents and intellectual property rights |  |
Intangible assets |  |
Net carrying amount - beginning of the year | (1,313) |
Net carrying amount at the end of the year | (1,402) | (1,313)
Accumulated depreciation, amortisation and impairment | Other intangible assets |  |
Intangible assets |  |
Net carrying amount - beginning of the year | (3,604) |
Net carrying amount at the end of the year | € (3,805) | € (3,604)

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