Post-employment benefits - Retirement Benefit Status (Details) - EUR (€) € in Millions	Dec. 31, 2021	Dec. 31, 2020
Employee Benefits [Abstract]
Present value of obligation	€ (2,413)	€ (2,340)
Fair value of assets	2,504	2,132
Net benefit status:	91	(208)
Retirement benefit surplus (Note 25)	194	43
Retirement benefit obligation	€ (103)	€ (251)

Employee Benefits [Abstract]

No definition available.

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- Definition

Surplus In Plan, Plan With Plan Assets In Excess Of Benefit Obligation

+ References

No definition available.

+ Details

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- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

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- Definition

The amount of non-current net defined benefit liability. [Refer: Net defined benefit liability]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
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-URIDate 2021-03-24

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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

+ Details

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- Definition

The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]]

+ References

+ Details

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