Revenue - Contract Balances (Details) - EUR (€) € in Billions	12 Months Ended
Dec. 31, 2018	Jan. 01, 2018
Revenue
Contract liabilities	€ 3.1	€ 3.5
Increases in contract liabilities mainly result from billing and invoices becoming due	7.0
Decreases in contract liabilities from satisfying performance obligations	7.5
Revenue that was included in contract liability balance at beginning of period	€ 3.2

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 105
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-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Number 15
-IssueDate 2018-01-01
-Paragraph 116
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_116_a&doctype=Standard
-URIDate 2018-03-16

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The decrease in contract liabilities resulting from the performance obligation being satisfied. [Refer: Contract liabilities; Performance obligations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_118_e&doctype=Standard
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- References

No definition available.

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Period Type:	duration

- Definition

The amount of revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 116
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_116_b&doctype=Standard
-URIDate 2018-03-16

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- Definition

The increase in contract liabilities resulting from billing and invoices becoming due.

+ References

No definition available.

+ Details

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