Debt, Cash and Cash Equivalents - Summary of Market Value of Net Debt (Details) - EUR (€) € in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2025 |
Dec. 31, 2024 |
|
| Disclosure of detailed information about borrowings [Line Items] | ||
| Market value | € 20,519 | € 16,137 |
| Market value | ||
| Disclosure of detailed information about borrowings [Line Items] | ||
| Market value | 4,589 | 8,165 |
| Value on redemption | ||
| Disclosure of detailed information about borrowings [Line Items] | ||
| Market value | 20,560 | 16,171 |
| Value on redemption | € 5,143 | € 8,806 |