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Income tax - Schedule of Tax Loss Carry-forwards Expected To Expire (Details)
€ in Millions
Dec. 31, 2021
EUR (€)
Tax losses carried forward  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire € 1,899
Research and development credit carry-forward  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire 52
2022 - 2031 | Tax losses carried forward  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire 0
2022 - 2031 | Research and development credit carry-forward  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire 0
2032 and onwards | Tax losses carried forward  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire 473
2032 and onwards | Research and development credit carry-forward  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire 52
Unlimited | Tax losses carried forward  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire 1,426
Unlimited | Research and development credit carry-forward  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire € 0