22 Depreciation, amortization and impairment losses

The following table provides a breakdown of depreciation, amortization and impairment losses:

millions of €
  2017 2016 2015
Amortization and impairment of intangible assets 6,193 4,602 4,109
Of which: Goodwill impairment losses 2,071 471 43
Amortization of mobile licenses 1,038 949 898
Impairment losses on mobile licenses 4
Depreciation and impairment of property, plant and equipment 8,393 8,778 7,251
Of which: Impairment losses recognized on property, plant and equipment 81 221 101
  14,586 13,380 11,360

Impairment losses break down as follows:

millions of €
  2017 2016 2015
Intangible assets 2,077 472 61
Of which: Goodwill from the year-end impairment test 829 471 43
Goodwill in connection with ad hoc impairment testing in the Systems Solutions operating segment 1,242
FCC licenses 4
Property, plant and equipment 81 221 101
Of which: From the year-end impairment test 37 128
  2,158 693 162

Depreciation, amortization and impairment losses increased by EUR 1.2 billion year-on-year, mainly as a result of the impairment losses recognized on goodwill in the Systems Solutions operating segment of EUR 1.2 billion and in the Europe operating segment in the national companies in Poland, Romania, and Albania of EUR 0.8 billion in total. Furthermore, impairment losses of EUR 0.1 billion were recognized on property, plant and equipment following scheduled and ad hoc impairment testing at the cash-generating units. Impairment losses on property, plant and equipment related mainly to the asset category of land and equivalent rights, and buildings ­including buildings on land owned by third parties and technical equipment and ­machinery. Depreciation and amortization were down slightly on the prior-year period. Depreciation and amortization relating primarily to the build-out of the 4G/LTE network in the United States operating ­segment increased this item. This was partially offset by lower depreciation in connection with terminal equipment leased as part of the JUMP! On Demand program.

For further details, please refer to Note 5 “Intangible assets" and Note 6 “Property, plant and equipment."