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Income tax - Schedule of Tax Loss Carry-forwards Expected To Expire (Details)
€ in Millions
Dec. 31, 2020
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 € 2,196
Research and Development Credit Carryforward  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire 28
Foreign Tax Credits  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire 2
2021-2030 | 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
2021-2030 | Research and Development Credit Carryforward  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire 0
2021-2030 | Foreign Tax Credits  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire 2
2031 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 695
2031 and Onwards | Research and Development Credit Carryforward  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire 28
2031 and Onwards | Foreign Tax Credits  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire 0
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 1,501
Unlimited | Research and Development Credit Carryforward  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire 0
Unlimited | Foreign Tax Credits  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax loss carry-forwards expected to expire € 0