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Investments Accounted for Using the Equity Method - Summary of Principal Transactions and Balances with Related Parties (Details) - Associates and joint ventures - EUR (€) € in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Disclosure of transactions between related parties [line items] |  |  |
Sales | € 64 | € 26 | € 131
Royalties and other income | 32 | 33 | 81
Accounts receivable and other receivables | 68 | 110 | 174
Purchases and other expenses (including research expenses) | 302 | 167 | 477
Accounts payable and other payables | € 97 | € 89 | € 132

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