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Provisions for employee benefits - Costs of defined benefit plans recognized in other comprehensive income (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement
Actuarial (gains)/losses due to changes in demographic assumptions	€ (11)
Actuarial (gains)/losses due to changes in financial assumptions	93	€ 60
Experience (gains) losses	(16)	10
Return on plan assets	(51)	(23)
Change in asset ceiling	1	(5)
Remeasurements	16	42	€ 15
Italian defined benefit plans
Statement
Actuarial (gains)/losses due to changes in demographic assumptions	(3)
Actuarial (gains)/losses due to changes in financial assumptions	9	7
Experience (gains) losses	(1)	(2)
Remeasurements	5	5
Foreign defined benefit plan
Statement
Actuarial (gains)/losses due to changes in demographic assumptions	(10)
Actuarial (gains)/losses due to changes in financial assumptions	71	50
Experience (gains) losses	(13)	(9)
Return on plan assets	(51)	(23)
Change in asset ceiling	1	(5)
Remeasurements	(2)	13
FISDE and other foreign medical plans
Statement
Actuarial (gains)/losses due to changes in demographic assumptions	2
Actuarial (gains)/losses due to changes in financial assumptions	13	3
Experience (gains) losses	(2)	21
Remeasurements	€ 13	€ 24

X

- Definition

Actuarial gains (losses) arising from changes in demographic assumptions, before tax

+ References

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- Definition

Actuarial gains (losses) arising from changes in financial assumptions, before tax

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- Definition

Actuarial gains (losses) arising from experience adjustments, before tax

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- Definition

Ifrs Statement

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- Definition

Increase (decrease) in asset ceiling, before tax

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- Definition

Return on plan assets excluding interest income or expense

+ References

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- Definition

The amount of other comprehensive income, before tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income, before tax; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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