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Consolidated shareholders’ equity - Summary of Number of Restricted Shares Not Yet Fully Vested (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Restricted shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Total expense for restricted share plans | € 206 | € 193 | € 222
Number of shares not yet fully vested (in shares) | 9,121,573 | 9,507,849 | 10,546,612
Restricted Share Plan 2022 |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares not yet fully vested (in shares) | 3,206,861 | 0 | 0
Restricted share plan 2021 |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares not yet fully vested (in shares) | 3,097,531 | 3,364,895 | 0
Restricted share plan 2020 |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares not yet fully vested (in shares) | 2,817,181 | 3,014,496 | 3,284,558
Restricted share plan 2019 |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares not yet fully vested (in shares) | 0 | 3,128,458 | 3,375,717
Restricted share plan 2018 |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares not yet fully vested (in shares) | 0 | 0 | 3,886,337

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