Restricted Cash and Other Non-current Assets - Summary of Restricted Cash and Other Non-current Assets (Details) - EUR (€) € in Millions |
Dec. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Restricted cash | ||
| Lease deposits and guarantees | € 52 | € 41 |
| Other | 3 | 1 |
| Other non-current assets | 10 | 12 |
| Restricted cash and other non-current assets | € 65 | € 54 |