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Cash and cash equivalents (Details) - EUR (€)
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
 [1]
Subclassifications of assets, liabilities and equities [abstract]        
Cash € 1,385,000,000 € 1,358,000,000 € 1,144,000,000  
Cash equivalents 11,351,000,000 8,740,000,000 12,771,000,000  
Cash and cash equivalents 12,736,000,000 10,098,000,000 13,915,000,000 [1],[2] € 9,427,000,000
Cash equivalents, money market mutual funds 9,537,000,000 5,057,000,000 8,703,000,000  
Cash equivalents, term deposits 1,167,000,000 2,768,000,000 3,259,000,000  
Cash equivalents, commercial paper 0 179,000,000 74,000,000  
Cash equivalents, captive insurance and reinsurance companies € 439,000,000 € 427,000,000 € 425,000,000  
[1] (j)    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.