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Net deferred tax position - Summary of Net Deferred Tax Position (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) € 3,540 € 2,981 € 2,406
Deferred tax liabilities 1,841 1,617 1,770 [1]
Reserves likely to be distributed in the foreseeable future 59,100    
Deferred tax assets 5,381 4,598 4,176 [2]
Consolidation adjustments (intragroup margin in inventory)      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) 1,388 1,292 1,142
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) 850 1,117 1,156
Remeasurement of other acquired intangible assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) (3,269) (3,079) (3,083)
Remeasurement of other acquired intangible assets | Bioverativ      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities 1,429    
Remeasurement of other acquired intangible assets | Principia      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities 625    
Remeasurement of other acquired intangible assets | Genzyme      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities 150    
Remeasurement of other acquired intangible assets | Ablynx N.V.      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities 229    
Remeasurement of other acquired intangible assets | Amunix      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liabilities 118    
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) (24) (26) (27)
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) (617) (590) (522)
Tax losses available for carry-forward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) 1,506 1,516 1,327
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) 92 88 89
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) 1,859 1,585 1,399
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Net deferred tax asset/(liability) 1,755 1,078 925
Deferred tax relating to restructuring provisions      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax assets € 256 € 307 € 259
[1] Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.
[2] Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.