v3.25.4
Income taxes - Deferred tax assets and liabilities (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income taxes [Line Items]      
Deferred tax (expense) benefit € (24) € 823 € (274)
Net deferred tax assets 1,681 1,835  
Intangible assets      
Income taxes [Line Items]      
Deferred tax liability (asset), beginning balance 373 679  
Deferred tax (expense) benefit (45) (333)  
Other changes in deferred tax assets and liabilities (27) 26  
Deferred tax liability (asset), ending balance 301 373 679
Net deferred tax assets 448 533  
Net deferred tax liabilities (147) (160)  
Property, plant and equipment      
Income taxes [Line Items]      
Deferred tax liability (asset), beginning balance (64) (88)  
Deferred tax (expense) benefit 9 25  
Other changes in deferred tax assets and liabilities 9 (1)  
Deferred tax liability (asset), ending balance (46) (64) (88)
Net deferred tax assets 50 39  
Net deferred tax liabilities (96) (103)  
Inventories      
Income taxes [Line Items]      
Deferred tax liability (asset), beginning balance 364 360  
Deferred tax (expense) benefit (13) (9)  
Other changes in deferred tax assets and liabilities (37) 13  
Deferred tax liability (asset), ending balance 314 364 360
Net deferred tax assets 315 369  
Net deferred tax liabilities (1) (5)  
Other assets      
Income taxes [Line Items]      
Deferred tax liability (asset), beginning balance 151 184  
Deferred tax (expense) benefit 12 (25)  
Other changes in deferred tax assets and liabilities (10) (9)  
Deferred tax liability (asset), ending balance 152 151 184
Net deferred tax assets 205 207  
Net deferred tax liabilities (53) (56)  
Pensions and other long-term employee benefits      
Income taxes [Line Items]      
Deferred tax liability (asset), beginning balance 152 193  
Deferred tax (expense) benefit 29 (61)  
Other changes in deferred tax assets and liabilities (9) 20  
Deferred tax liability (asset), ending balance 172 152 193
Net deferred tax assets 180 179  
Net deferred tax liabilities (7) (27)  
Other liabilities      
Income taxes [Line Items]      
Deferred tax liability (asset), beginning balance 319 496  
Deferred tax (expense) benefit (29) (198)  
Other changes in deferred tax assets and liabilities (16) 20  
Deferred tax liability (asset), ending balance 274 319 496
Net deferred tax assets 312 365  
Net deferred tax liabilities (38) (47)  
Deferred tax assets on tax loss carryforwards      
Income taxes [Line Items]      
Deferred tax liability (asset), beginning balance 541 730  
Deferred tax (expense) benefit 61 (222)  
Other changes in deferred tax assets and liabilities (88) 33  
Deferred tax liability (asset), ending balance 513 541 730
Net deferred tax assets 513 541  
Net deferred tax liabilities 0 0  
Set-off deferred tax positions      
Income taxes [Line Items]      
Deferred tax liability (asset), beginning balance 0 0  
Deferred tax (expense) benefit 0 0  
Other changes in deferred tax assets and liabilities 0 0  
Deferred tax liability (asset), ending balance 0 0 0
Net deferred tax assets (250) (317)  
Net deferred tax liabilities 250 317  
Net deferred tax assets      
Income taxes [Line Items]      
Deferred tax liability (asset), beginning balance 1,835 2,556  
Deferred tax (expense) benefit 24 (823)  
Other changes in deferred tax assets and liabilities (178) 102  
Deferred tax liability (asset), ending balance 1,681 1,835 € 2,556
Net deferred tax assets 1,773 1,916  
Net deferred tax liabilities € (93) € (81)