Trade and Other Receivables - Summary of Movements in Group's Allowance for Expected Credit Losses (Details) - EUR (€) € in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Disclosure Of Trade And Other Receivables [Line Items] | ||
| Beginning balance | € 8 | |
| Ending balance | 5 | € 8 |
| Trade Receivables | ||
| Disclosure Of Trade And Other Receivables [Line Items] | ||
| Beginning balance | 8 | 15 |
| Provision for expected credit losses | 12 | 15 |
| Reversal of unutilized provisions | (12) | (18) |
| Receivables written off | (3) | (4) |
| Ending balance | € 5 | € 8 |