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Other Operating Income And Expenses - Schedule of Other Operating Expenses (Details) - EUR (€)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating expenses € (1,422) € (1,204) € (2,531)
Other operating income 617 416 1,969
Other operating income/(expenses), net related to Regeneron (1,321) (1,068) (1,231)
Other related parties | Other operating income (expense)      
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating income 160 153  
Monoclonal Antibodies Alliance      
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating expenses (1,418) (1,098) (2,367)
Monoclonal Antibodies Alliance | Income & expense related to profit/loss sharing under the Monoclonal Antibody Alliance      
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating expenses (1,449) (979) (2,325)
Monoclonal Antibodies Alliance | Additional share of profit paid by Regeneron towards development costs      
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating income 291 97 434
Monoclonal Antibodies Alliance | Reimbursement to Regeneron of selling expenses incurred      
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating expenses (260) (216) (476)
Immuno-Oncology Alliance      
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating income 0 36 16
Other (mainly Zaltrap® and Libtayo®)      
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating income and expenses 97 (6) 1,120
Regeneron | Other operating income (expense)      
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating income 102 133 € 1,147
Regeneron | Other related parties | Reimbursement to Regeneron of selling expenses incurred      
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating expenses € (1,423) € (1,201)