Income Tax - Summary of Deferred Tax Assets Unrecognized (Details) - EUR (€) € in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Disclosure Of Deferred Tax Assets And Liabilities [Line Items] | ||
| Deferred tax assets unrecognized | € 379 | € 276 |
| Intangible Assets | ||
| Disclosure Of Deferred Tax Assets And Liabilities [Line Items] | ||
| Deferred tax assets unrecognized | 77 | 72 |
| Share-based Compensation | ||
| Disclosure Of Deferred Tax Assets And Liabilities [Line Items] | ||
| Deferred tax assets unrecognized | 58 | 34 |
| Tax Losses Carried Forward | ||
| Disclosure Of Deferred Tax Assets And Liabilities [Line Items] | ||
| Deferred tax assets unrecognized | 192 | 148 |
| Unrealized Losses | ||
| Disclosure Of Deferred Tax Assets And Liabilities [Line Items] | ||
| Deferred tax assets unrecognized | 3 | 2 |
| Other | ||
| Disclosure Of Deferred Tax Assets And Liabilities [Line Items] | ||
| Deferred tax assets unrecognized | € 49 | € 20 |