Cash and cash equivalents and short term investments - Short Term Investments (Details) - EUR (€) € in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of Cash and Cash Equivalents by Currency [Line Items]
Short term investments	€ 58	€ 0
Papua New Guinean Kina
Disclosure of Cash and Cash Equivalents by Currency [Line Items]
Short term investments	€ 44

The amount of short-term deposits held by the entity that are not classified as cash equivalents. [Refer: Cash equivalents]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_ShorttermDepositsNotClassifiedAsCashEquivalents
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant