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Provisions for employee benefits (Details 8) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 EUR (€) yr | Dec. 31, 2016 EUR (€) yr
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | € 1,022 | € 868
TFR [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 284 | 298
TFR [Member] | Not later than one year [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 16 | 13
TFR [Member] | Later than one year and not later than two years [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 17 | 14
TFR [Member] | Later than two years and not later than three years [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 18 | 15
TFR [Member] | Later than three years and not later than four years [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 17 | 17
TFR [Member] | Later Than Three Years And Not Later Than Five Years [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 14 | 19
TFR [Member] | Later than Five Years [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | € 202 | € 220
TFR [Member] | Weighted average duration [Member] |  |
Statement Line Items [Line Items] |  |
Weighted average duration of defined benefit obligation | yr | 10.1 | 10.3
Foreign defined benefit plans [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | € 409 | € 276
Foreign defined benefit plans [Member] | Not later than one year [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 47 | 31
Foreign defined benefit plans [Member] | Later than one year and not later than two years [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 65 | 44
Foreign defined benefit plans [Member] | Later than two years and not later than three years [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 70 | 33
Foreign defined benefit plans [Member] | Later than three years and not later than four years [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 79 | 33
Foreign defined benefit plans [Member] | Later Than Three Years And Not Later Than Five Years [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 84 | 38
Foreign defined benefit plans [Member] | Later than Five Years [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | € 64 | € 97
Foreign defined benefit plans [Member] | Weighted average duration [Member] |  |
Statement Line Items [Line Items] |  |
Weighted average duration of defined benefit obligation | yr | 17.5 | 17.9
FISDE and other foreign medical plans [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | € 122 | € 124
FISDE and other foreign medical plans [Member] | Not later than one year [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 5 | 5
FISDE and other foreign medical plans [Member] | Later than one year and not later than two years [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 5 | 5
FISDE and other foreign medical plans [Member] | Later than two years and not later than three years [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 5 | 5
FISDE and other foreign medical plans [Member] | Later than three years and not later than four years [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 5 | 5
FISDE and other foreign medical plans [Member] | Later Than Three Years And Not Later Than Five Years [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 5 | 5
FISDE and other foreign medical plans [Member] | Later than Five Years [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | € 97 | € 99
FISDE and other foreign medical plans [Member] | Weighted average duration [Member] |  |
Statement Line Items [Line Items] |  |
Weighted average duration of defined benefit obligation | yr | 13.7 | 13.9
Other benefit plans [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | € 207 | € 170
Other benefit plans [Member] | Not later than one year [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 66 | 37
Other benefit plans [Member] | Later than one year and not later than two years [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 60 | 59
Other benefit plans [Member] | Later than two years and not later than three years [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 46 | 52
Other benefit plans [Member] | Later than three years and not later than four years [member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 8 | 3
Other benefit plans [Member] | Later Than Three Years And Not Later Than Five Years [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | 6 | 3
Other benefit plans [Member] | Later than Five Years [Member] |  |
Statement Line Items [Line Items] |  |
Net defined benefit liability (asset) | € 31 | € 42
Other benefit plans [Member] | Weighted average duration [Member] |  |
Statement Line Items [Line Items] |  |
Weighted average duration of defined benefit obligation | yr | 3.0 | 3.4

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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_c&doctype=Standard -URIDate 2017-03-09 + Details
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