4. Depreciation and amortisation costs and (reversal of) impairment losses

(in millions of euros)	Note	2023	2022
Depreciation of property, plant and equipment	12	249	231
Depreciation of investment property	13	7	7
Amortisation of intangible assets	14	125	131
Depreciation of right-of-use assets	31	91	59
Total cost of depreciation and amortisation		472	428

Impairments/reversal of impairments of property, plant and equipment	12	379	-340
Impairments/reversal of impairments of intangible assets	14	23	-33
Impairments/reversal of impairments of right-of-use assets	31	121	-12
Total impairments/reversal of impairments	15	523	-385

Total		995	43

For information on impairments of non-current assets and reversal of these impairments, please refer to note 15.