4. Depreciation, amortisation and impairments

(in millions of euros)	Notes	2024	2023
Depreciation of property, plant and equipment	12	224	239
Depreciation of investment property	13	6	7
Amortisation of intangible assets	14	103	124
Depreciation of right-of-use assets	31	38	45
Total cost of depreciation and amortisation		372	415

Impairments of property, plant and equipment	12	86	379
Impairments of intangible assets	14	3	23
Impairments of right-of-use assets	31	1	-
Total impairments	15	90	402

Total		462	817

For information on impairments of non-current assets, see note 15.