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Intangible assets (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
EUR (€)
Intangible assets      
Net carrying amount - beginning of the year € 5,525   € 4,799
Additions 476   356
Amortization (355)   (310)
Impairments (45)   (167)
Reversals 11    
Write-off (88)   (13)
Changes in the scope of consolidation 779   673
Currency translation differences (20)   66
Other changes 96   121
Net carrying amount - end of the year 6,379   5,525
Intangible assets with definite useful lives      
Intangible assets      
Net carrying amount - beginning of the year 2,363   1,913
Additions 476   356
Amortization (355)   (310)
Impairments (39)   (14)
Reversals 11    
Write-off (88)   (13)
Changes in the scope of consolidation 752   191
Currency translation differences (20)   55
Other changes 120   185
Net carrying amount - end of the year 3,220   2,363
Exploration rights      
Intangible assets      
Net carrying amount - beginning of the year 793 $ 793 913
Additions 20   53
Amortization (8)   (12)
Impairments (22)    
Reversals 11    
Write-off (85)   (13)
Changes in the scope of consolidation     (200)
Currency translation differences (19)   54
Other changes (27)   (2)
Net carrying amount - end of the year 663   793
Industrial patents and intellectual property rights      
Intangible assets      
Net carrying amount - beginning of the year 176   155
Additions 41   28
Amortization (92)   (74)
Changes in the scope of consolidation 291    
Other changes 34   67
Net carrying amount - end of the year 450   176
Other intangible assets with definite useful lives      
Intangible assets      
Net carrying amount - beginning of the year 1,394   845
Additions 415   275
Amortization (255)   (224)
Impairments (17)   (14)
Write-off (3)    
Changes in the scope of consolidation 461   391
Currency translation differences (1)   1
Other changes 113   120
Net carrying amount - end of the year 2,107   1,394
Goodwill      
Intangible assets      
Net carrying amount - beginning of the year 3,138   2,862
Impairments (6)   (153)
Changes in the scope of consolidation 25   482
Currency translation differences     11
Other changes (24)   (64)
Net carrying amount - end of the year 3,133   3,138
Other intangible assets with indefinite useful lives      
Intangible assets      
Net carrying amount - beginning of the year 24   24
Changes in the scope of consolidation 2    
Net carrying amount - end of the year 26   24
Gross carrying amount | Intangible assets with definite useful lives      
Intangible assets      
Net carrying amount - beginning of the year 6,939    
Net carrying amount - end of the year 8,088   6,939
Gross carrying amount | Exploration rights      
Intangible assets      
Net carrying amount - beginning of the year 1,428    
Net carrying amount - end of the year 1,295   1,428
Gross carrying amount | Industrial patents and intellectual property rights      
Intangible assets      
Net carrying amount - beginning of the year 1,806    
Net carrying amount - end of the year 2,119   1,806
Gross carrying amount | Other intangible assets with definite useful lives      
Intangible assets      
Net carrying amount - beginning of the year 3,705    
Net carrying amount - end of the year 4,674   3,705
Accumulated depreciation, amortisation and impairment | Intangible assets with definite useful lives      
Intangible assets      
Net carrying amount - beginning of the year (4,576)    
Net carrying amount - end of the year (4,868)   (4,576)
Accumulated depreciation, amortisation and impairment | Exploration rights      
Intangible assets      
Net carrying amount - beginning of the year (635)    
Net carrying amount - end of the year (632)   (635)
Accumulated depreciation, amortisation and impairment | Industrial patents and intellectual property rights      
Intangible assets      
Net carrying amount - beginning of the year (1,630)    
Net carrying amount - end of the year (1,669)   (1,630)
Accumulated depreciation, amortisation and impairment | Other intangible assets with definite useful lives      
Intangible assets      
Net carrying amount - beginning of the year (2,311)    
Net carrying amount - end of the year € (2,567)   € (2,311)