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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, 2023 | Jun. 30, 2022
Restricted shares |  |
Disclosure of classes of share capital [Line Items] |  |
Total expense for restricted share plans | € 108 | € 105
Number of shares not yet fully vested (in shares) | 10,127,545 | 9,559,052
Restricted share plan 2023 |  |
Disclosure of classes of share capital [Line Items] |  |
Number of shares not yet fully vested (in shares) | 3,837,974 | 0
Restricted share plan 2022 |  |
Disclosure of classes of share capital [Line Items] |  |
Number of shares not yet fully vested (in shares) | 3,226,321 | 3,341,379
Restricted share plan 2021 |  |
Disclosure of classes of share capital [Line Items] |  |
Number of shares not yet fully vested (in shares) | 2,996,101 | 3,281,880
Restricted share plan 2020 |  |
Disclosure of classes of share capital [Line Items] |  |
Number of shares not yet fully vested (in shares) | 67,149 | 2,935,793

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