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Consolidated shareholders’ equity - Summary of Movements within Other Comprehensive Income (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of analysis of other comprehensive income by item [line items]      
Items not subsequently reclassifiable to profit or loss € 451,000,000 € 797,000,000 [1] € 14,000,000 [1]
Items subsequently reclassifiable to profit or loss 2,313,000,000 2,510,000,000 [1] (4,021,000,000) [1]
Accumulated other comprehensive income | Items not subsequently reclassifiable to profit or loss      
Disclosure of analysis of other comprehensive income by item [line items]      
Actuarial gains/(losses) excluding investments accounted for using the equity method (see Note D.19.1.) 650,000,000 685,000,000 (266,000,000)
Actuarial gains/(losses) of investments accounted for using the equity method, net of taxes 4,000,000 1,000,000 (1,000,000)
Tax effects (212,000,000) (36,000,000) 45,000,000
Accumulated other comprehensive income | Items not subsequently reclassifiable to profit or loss | Equity instruments included in financial assets      
Disclosure of analysis of other comprehensive income by item [line items]      
Change in fair value (excluding investments accounted for using the equity method) (4,000,000) 154,000,000 358,000,000
Change in fair value (investments accounted for using the equity method, net of taxes) 0 0 (14,000,000)
Equity risk hedging instruments designated as fair value hedges 17,000,000 11,000,000 (24,000,000)
Tax effects (4,000,000) (18,000,000) (84,000,000)
Items not subsequently reclassifiable to profit or loss 451,000,000 797,000,000 14,000,000
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss      
Disclosure of analysis of other comprehensive income by item [line items]      
Change in fair value (excluding investments accounted for using the equity method) 5,000,000 (6,000,000) 4,000,000
Change in fair value (investments accounted for using the equity method, net of taxes) 2,000,000 0 0
Tax effects (1,000,000) 2,000,000 (2,000,000)
Currency translation differences on foreign subsidiaries (excluding investments accounted for using the equity method) 2,643,000,000 2,719,000,000 (3,870,000,000)
Currency translation differences (investments accounted for using the equity method) (11,000,000) (6,000,000) 32,000,000
Hedges of net investments in foreign operations (354,000,000) (254,000,000) 180,000,000
Tax effects 91,000,000 71,000,000 (59,000,000)
Items subsequently reclassifiable to profit or loss 2,313,000,000 2,510,000,000 (4,021,000,000)
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss | Regeneron      
Disclosure of analysis of other comprehensive income by item [line items]      
Currency translation differences (investments accounted for using the equity method) 0 0 (318,000,000)
Tax effects     (2,000,000)
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss | Debt instruments      
Disclosure of analysis of other comprehensive income by item [line items]      
Change in fair value (excluding investments accounted for using the equity method) (77,000,000) (21,000,000) 15,000,000
Tax effects 15,000,000 5,000,000 (3,000,000)
Items subsequently reclassifiable to profit or loss 0 4,000,000 5,000,000
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss | Cash Flow And Fair Value Hedge      
Disclosure of analysis of other comprehensive income by item [line items]      
Items subsequently reclassifiable to profit or loss 2,000,000 12,000,000 1,000,000
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss | Foreign Currency Translation      
Disclosure of analysis of other comprehensive income by item [line items]      
Items subsequently reclassifiable to profit or loss 40,000,000 € 0 € 0
Accumulated other comprehensive income | Items subsequently reclassifiable to profit or loss | Foreign Currency Translation | EUROAPI      
Disclosure of analysis of other comprehensive income by item [line items]      
Items subsequently reclassifiable to profit or loss € 35,000,000    
[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.