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Net deferred tax position - Summary of Net Deferred Tax Position (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) € 4,570 € 3,540 € 2,981
Deferred tax liabilities 1,857 1,841 1,617
Reserves likely to be distributed in the foreseeable future 60,400    
Deferred tax assets 6,427 5,381 4,598
Consolidation adjustments (intragroup margin in inventory)      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) 1,525 1,388 1,292
Provision for pensions and other employee benefits      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) 853 850 1,117
Remeasurement of other acquired intangible assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) (2,904) (3,269) (3,079)
Remeasurement of other acquired intangible assets | Bioverativ(c)      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities 1,241    
Remeasurement of other acquired intangible assets | Principia      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities 610    
Remeasurement of other acquired intangible assets | Genzyme      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities 50    
Remeasurement of other acquired intangible assets | Ablynx NV      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities 204    
Remeasurement of other acquired intangible assets | Amunix      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities 109    
Recognition of acquired property, plant and equipment at fair value      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) (21) (24) (26)
Equity interests in subsidiaries and investments in other entities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) (1,023) (617) (590)
Tax losses available for carry-forward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) 1,526 1,506 1,516
Stock options and other share-based payments      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) 84 92 88
Accrued expenses and provisions deductible at time of payments      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) 1,994 1,859 1,585
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) 2,536 1,755 1,078
Deferred tax relating to restructuring provisions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets 286 256 € 226
Deferred tax relating to capitalisation of R&D expenses      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets € 1,331 € 742