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Consolidated shareholders' equity - Summary of Number of Restricted Shares Not Yet Fully Vested (Details) - EUR (€) € in Millions | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Restricted shares |  |
Disclosure of classes of share capital [Line Items] |  |
Total expense for restricted share plans | € 138 | € 146
Number of shares not yet fully vested (in shares) | 12,995,668 | 11,550,347
Under 2026 plans |  |
Disclosure of classes of share capital [Line Items] |  |
Number of shares not yet fully vested (in shares) | 5,267,518 | 0
Under 2025 plans |  |
Disclosure of classes of share capital [Line Items] |  |
Number of shares not yet fully vested (in shares) | 3,897,342 | 4,020,451
Under 2024 plans |  |
Disclosure of classes of share capital [Line Items] |  |
Number of shares not yet fully vested (in shares) | 3,772,461 | 4,110,089
Under 2023 plans |  |
Disclosure of classes of share capital [Line Items] |  |
Number of shares not yet fully vested (in shares) | 58,347 | 3,313,588
Under 2022 plans |  |
Disclosure of classes of share capital [Line Items] |  |
Number of shares not yet fully vested (in shares) | 0 | 106,219

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