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Provisions for employee benefits (Details 7) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Top Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] |  |
Statement Line Items [Line Items] |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |
Top Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | TFR [Member] |  |
Statement Line Items [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | € (13) | € (15)
Top Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | Foreign defined benefit plans [Member] |  |
Statement Line Items [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | (72) | (57)
Top Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | FISDE and other foreign medical plans [Member] |  |
Statement Line Items [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | (7) | (7)
Top Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | Other benefit plans [Member] |  |
Statement Line Items [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | € (3) | (2)
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Inflation [Member] |  |
Statement Line Items [Line Items] |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Inflation [Member] | TFR [Member] |  |
Statement Line Items [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | € 9 | 10
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Inflation [Member] | Foreign defined benefit plans [Member] |  |
Statement Line Items [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 24 | 33
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Inflation [Member] | Other benefit plans [Member] |  |
Statement Line Items [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | € 1 | 1
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Salary Increases [Member] |  |
Statement Line Items [Line Items] |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Salary Increases [Member] | Foreign defined benefit plans [Member] |  |
Statement Line Items [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | € 20 | 15
Top Of Range [Member] | Actuarial Assumption Of Medical Cost Trend Rates [Member] |  |
Statement Line Items [Line Items] |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |
Top Of Range [Member] | Actuarial Assumption Of Medical Cost Trend Rates [Member] | FISDE and other foreign medical plans [Member] |  |
Statement Line Items [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | € 7 | 8
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Pension Increases [Member] |  |
Statement Line Items [Line Items] |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |
Top Of Range [Member] | Actuarial Assumption Of Expected Rates Of Pension Increases [Member] | Foreign defined benefit plans [Member] |  |
Statement Line Items [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | € 13 | 23
Bottom Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] |  |
Statement Line Items [Line Items] |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |
Bottom Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | TFR [Member] |  |
Statement Line Items [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | € 14 | 16
Bottom Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | Foreign defined benefit plans [Member] |  |
Statement Line Items [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 79 | 66
Bottom Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | FISDE and other foreign medical plans [Member] |  |
Statement Line Items [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 7 | 8
Bottom Of Range [Member] | Actuarial Assumption Of Discount Rates [Member] | Other benefit plans [Member] |  |
Statement Line Items [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | € 1 | € 2

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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