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Share-based Payments - Summary of Impact of Changes on Stock Options Expense for Options Granted (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Share Based Payments [Line Items] |  |  |
Share-based compensation | € 176 | € 122 | € 88
Volatility Decreased by 10% |  |  |
Stock option expense increase (decrease) under the following assumption changes |  |  |
Volatility increase (decrease) by 10% | (9) |  |
Volatility Increase by 10% |  |  |
Stock option expense increase (decrease) under the following assumption changes |  |  |
Volatility increase (decrease) by 10% | 9 |  |
Expected Life Decrease by 1 Year |  |  |
Stock option expense increase (decrease) under the following assumption changes |  |  |
Expected life decrease by 1 year | (6) |  |
Expected Life Increase by 1 Year |  |  |
Stock option expense increase (decrease) under the following assumption changes |  |  |
Expected life decrease by 1 year | 5 |  |
Options Granted in 2020 |  |  |
Disclosure Of Share Based Payments [Line Items] |  |  |
Share-based compensation | € 30 |  |

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