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Treasury risk management - Summary of Financial Liabilities are Subject to Offsetting, Enforceable Master Netting Arrangements and Similar Agreements (Details) - Derivative financial liabilities - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of offsetting of financial liabilities [line items]    
Gross amounts of recognised financial liabilities € (347) € (566)
Gross amounts of recognised financial liabilities set off in the balance sheet 112 148
Net amounts of financial liabilities presented in the balance sheet (235) (418)
Financial instruments 107 91
Cash collateral received 0 0
Net amount € (128) € (327)