13. Intangible non-current assets

(in millions of euros)

Goodwill

Software and
concessions

Total

Composition per 1 January 2015

   
    

Cost

37

209

246

Cumulative depreciation and impairment

5

67

72

Carrying amount as at 1 January 2015

32

142

174

    

Changes in 2015

   

Additions

-

65

65

Depreciation

-

-36

-36

Divestments

-

-

-

Impairment

-

-

-

Reversal impairment

-

-

-

Other changes

1

19

19

Total changes

1

48

48

    

Composition per 31 December 2015

   
    

Cost

38

361

404

Cumulative depreciation and impairment

5

169

179

Carrying amount as at 31 December 2015

33

192

225

    

Changes in 2016

   

Additions

-

86

86

Depreciation

-

-40

-40

Divestments

-

-

-

Impairments

-

-

-

Reversal impairment

-

-

-

Other changes

-13

-1

-14

Total changes

-13

45

32

    

Composition per 31 December 2016

   
    

Cost

20

469

489

Cumulative depreciation and impairment

-

232

232

Carrying amount as at 31 December 2016

20

237

257

The other changes in 2016 mainly due to the transfer of goodwill to assets held for sale. The remaining goodwill relates to our operations in the UK and Germany.

The cash flows that were used for determining the impairments are based on the business plans drawn up by the business unit concerned for a period of at least five years. A weighted average discount rate is determined for each cash-generating unit, in line with those for comparable companies. The calculations that give the impairments and their reversals are based on a weighted average post-tax discount rate that is between 5.5% and 7% (2015: between 5.5% and 7%). Changes in the assumptions did not lead to a deviation from the amounts calculated.