Commitments and contingencies - Contractual obligations (Details) € in Millions	Dec. 31, 2018 EUR (€)
Contractual obligations
Purchase obligations	€ 3,248
Operating leases	1,099
Total contractual obligations	4,347
Lease obligations on properties unavailable for use	217
2019
Contractual obligations
Purchase obligations	2,837
Operating leases	270
Total contractual obligations	3,107
1 to 3 years
Contractual obligations
Purchase obligations	357
Operating leases	319
Total contractual obligations	676
4 to 5 years
Contractual obligations
Purchase obligations	41
Operating leases	207
Total contractual obligations	248
More than 5 years
Contractual obligations
Purchase obligations	13
Operating leases	303
Total contractual obligations	€ 316

The amount of future minimum lease payments payable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2018-01-01
-Paragraph 35
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2018-03-02&anchor=para_35_a&doctype=Standard&book=b
-URIDate 2018-03-16

Name:	ifrs-full_MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant