Leases - Lease liabilities (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases
Lease liabilities, beginning	€ 1,066
Cash flows	(221)	€ (2)	€ (7)
Net additions	194
Other	(9)
Lease liabilities, end	€ 1,030	€ 1,066

The increase in liabilities arising from financing activities resulting from new leases. [Refer: Liabilities arising from financing activities]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2019-01-01
-Section A Statement of cash flows for an entity other than a financial institution
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-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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-URIDate 2019-03-27

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Period Type:	duration

- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
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-Subparagraph b
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- Definition

The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2019-01-01
-Paragraph 17
-Subparagraph e
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- References

No definition available.

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- Definition

Other increase (decrease) to lease liabilities.

+ References

No definition available.

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