Income Tax - Additional Information (Details) - EUR (€) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Disclosure Of Income Tax [Line Items] | |||
| Income tax (benefit)/expense relating to components of other comprehensive (loss)/income | € (31,000,000) | € 147,000,000 | € 0 |
| Uncertain tax position liability, expected to be resolved | 0 | ||
| Deferred tax on foreign exchange differences | 1,000,000 | 8,000,000 | € 0 |
| Deferred tax liability recognized on investment in subsidiaries | 0 | ||
| TME | |||
| Disclosure Of Income Tax [Line Items] | |||
| Deferred tax on foreign exchange differences | € 0 | € 8,000,000 | |
| Luxembourg | |||
| Disclosure Of Income Tax [Line Items] | |||
| Statutory tax rate | 24.94% | 26.01% | 27.08% |
| Provisions | |||
| Disclosure Of Income Tax [Line Items] | |||
| Current income tax expense on uncertain tax positions | € 0 | ||
| Uncertain tax position liability | € 1,000,000 | ||