Lease agreements - Right-of-use assets - Reconciliation (Details) € in Millions	12 Months Ended
Dec. 31, 2019 EUR (€)
Presentation of leases for lessee [abstract]
Net book value of right-of-use assets - in the opening balance	€ 6,347
Increase (new right-of-use assets)	1,009
Impact of changes in the scope of consolidation	18
Depreciation and amortization	(1,239)
Impairment	(33)
Impact of changes in the assessments	169
Translation adjustment	21
Reclassifications and other items	(28)
Net book value of right-of-use assets - in the closing balance	€ 6,263

The amount of additions to right-of-use assets. [Refer: Right-of-use assets]

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

The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 53
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-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_a&doctype=Standard
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- References

No definition available.

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- Definition

The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 53
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-URIDate 2019-03-27

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- Definition

Right-of-use assets, impact of changes in the assessments

+ References

No definition available.

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- Definition

Right-of-use assets, impact of changes in the scope of consolidation

+ References

No definition available.

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- Definition

Right-of-use assets, impairment

+ References

No definition available.

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- Definition

Right-of-use assets, reclassifications and other items

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- Definition

Right-of-use assets, translation adjustment

+ References

No definition available.

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Period Type:	duration