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Provisions for employee benefits - Present value of employee benefits, estimated by applying actuarial techniques (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Statement |  |
Net benefit liability (asset) at beginning of year | € 1,136 |
Net benefit liability (asset) at end of year | 1,201 | € 1,136
Other benefit plans |  |
Statement |  |
Net benefit liability (asset) at beginning of year | 278 |
Net benefit liability (asset) at end of year | 268 | 278
Defined benefit plan |  |
Statement |  |
Net defined benefit liability (asset) at beginning of year | 858 |
Net defined benefit liability (asset) at end of year | 933 | 858
Italian defined benefit plans |  |
Statement |  |
Net defined benefit liability (asset) at beginning of year | 269 |
Net defined benefit liability (asset) at end of year | 258 | 269
Foreign defined benefit plan |  |
Statement |  |
Net defined benefit liability (asset) at beginning of year | 412 |
Net defined benefit liability (asset) at end of year | 493 | 412
FISDE and other foreign medical plans |  |
Statement |  |
Net defined benefit liability (asset) at beginning of year | 177 |
Net defined benefit liability (asset) at end of year | 182 | 177
Present value of benefit liabilities |  |
Statement |  |
Net benefit liability (asset) at beginning of year | 1,768 | 1,657
Current cost | 76 | 76
Interest cost/income | 32 | 45
Remeasurements: | 70 | 71
- actuarial (gains) losses due to changes in demographic assumptions | (9) |
- actuarial (gains) losses due to changes in financial assumptions | 98 | 61
- experience (gains) losses | (19) | 10
Past service cost and (gains) losses settlements | 18 | 7
Plan contributions: | 1 | 1
- employee contributions | 1 | 1
Benefits paid | (125) | (140)
Currency translation differences and other changes | 8 | 51
Net benefit liability (asset) at end of year | 1,848 | 1,768
Present value of benefit liabilities | Other benefit plans |  |
Statement |  |
Net benefit liability (asset) at beginning of year | 278 | 309
Current cost | 50 | 55
Interest cost/income | 1 | 1
Remeasurements: | 4 | 1
- actuarial (gains) losses due to changes in demographic assumptions | 2 |
- actuarial (gains) losses due to changes in financial assumptions | 5 | 1
- experience (gains) losses | (3) |
Past service cost and (gains) losses settlements | 20 | (2)
Benefits paid | (63) | (88)
Currency translation differences and other changes | (22) | 2
Net benefit liability (asset) at end of year | 268 | 278
Present value of benefit liabilities | Defined benefit plan |  |
Statement |  |
Net defined benefit liability (asset) at beginning of year | 1,490 | 1,348
Current cost | 26 | 21
Interest cost/income | 31 | 44
Remeasurements: | 66 | 70
- 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
Past service cost and (gains) losses settlements | (2) | 9
Plan contributions: | 1 | 1
- employee contributions | 1 | 1
Benefits paid | (62) | (52)
Currency translation differences and other changes | 30 | 49
Net defined benefit liability (asset) at end of year | 1,580 | 1,490
Present value of benefit liabilities | Italian defined benefit plans |  |
Statement |  |
Net defined benefit liability (asset) at beginning of year | 269 | 275
Interest cost/income | 2 | 4
Remeasurements: | 5 | 5
- 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)
Benefits paid | (20) | (15)
Currency translation differences and other changes | 2 |
Net defined benefit liability (asset) at end of year | 258 | 269
Present value of benefit liabilities | Foreign defined benefit plan |  |
Statement |  |
Net defined benefit liability (asset) at beginning of year | 1,044 | 925
Current cost | 23 | 19
Interest cost/income | 27 | 37
Remeasurements: | 48 | 41
- 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)
Past service cost and (gains) losses settlements | (2) | 1
Plan contributions: | 1 | 1
- employee contributions | 1 | 1
Benefits paid | (33) | (28)
Currency translation differences and other changes | 32 | 48
Net defined benefit liability (asset) at end of year | 1,140 | 1,044
Present value of benefit liabilities | FISDE and other foreign medical plans |  |
Statement |  |
Net defined benefit liability (asset) at beginning of year | 177 | 148
Current cost | 3 | 2
Interest cost/income | 2 | 3
Remeasurements: | 13 | 24
- 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
Past service cost and (gains) losses settlements |  | 8
Benefits paid | (9) | (9)
Currency translation differences and other changes | (4) | 1
Net defined benefit liability (asset) at end of year | 182 | 177
Plan assets |  |
Statement |  |
Net benefit liability (asset) at beginning of year | (632) | (545)
Interest cost/income | (15) | (20)
Return on plan assets | (51) | (23)
Past service cost and (gains) losses settlements | 3 |
Plan contributions: | (15) | (14)
- employee contributions | (1) | (1)
- employer contributions | (14) | (13)
Benefits paid | 21 | 19
Currency translation differences and other changes | 41 | (49)
Net benefit liability (asset) at end of year | (648) | (632)
Plan assets | Defined benefit plan |  |
Statement |  |
Net defined benefit liability (asset) at beginning of year | (632) | (545)
Interest cost/income | (15) | (20)
Return on plan assets | (51) | (23)
Past service cost and (gains) losses settlements | 3 |
Plan contributions: | (15) | (14)
- employee contributions | (1) | (1)
- employer contributions | (14) | (13)
Benefits paid | 21 | 19
Currency translation differences and other changes | 41 | (49)
Net defined benefit liability (asset) at end of year | (648) | (632)
Plan assets | Foreign defined benefit plan |  |
Statement |  |
Net defined benefit liability (asset) at beginning of year | (632) | (545)
Interest cost/income | (15) | (20)
Return on plan assets | (51) | (23)
Past service cost and (gains) losses settlements | 3 |
Plan contributions: | (15) | (14)
- employee contributions | (1) | (1)
- employer contributions | (14) | (13)
Benefits paid | 21 | 19
Currency translation differences and other changes | 41 | (49)
Net defined benefit liability (asset) at end of year | (648) | (632)
Asset ceiling |  |
Statement |  |
Net benefit liability (asset) at beginning of year |  | 5
Change in asset ceiling | 1 | (5)
Net benefit liability (asset) at end of year | 1 |
Asset ceiling | Defined benefit plan |  |
Statement |  |
Net defined benefit liability (asset) at beginning of year |  | 5
Change in asset ceiling | 1 | (5)
Net defined benefit liability (asset) at end of year | 1 |
Asset ceiling | Foreign defined benefit plan |  |
Statement |  |
Net defined benefit liability (asset) at beginning of year |  | 5
Change in asset ceiling | 1 | € (5)
Net defined benefit liability (asset) at end of year | € 1 |

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_g&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Interest expense (income), net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c_i&doctype=Standard -URIDate 2020-01-01 + Details
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