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Post-employment benefits - Sensitivity of key assumptions (Detail) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Discount rate (1% movement) [Member] |  |
Sensitivity analysis for actuarial assumptions [Line items] |  |
Increase | € (323) | € (544)
Decrease | 394 | 645
Inflation rate (1% movement) [Member] |  |
Sensitivity analysis for actuarial assumptions [Line items] |  |
Increase | 85 | 139
Decrease | (86) | (126)
Salary increase (1% movement) [Member] |  |
Sensitivity analysis for actuarial assumptions [Line items] |  |
Increase | 20 | 27
Decrease | (19) | (23)
Longevity (1% movement) [Member] |  |
Sensitivity analysis for actuarial assumptions [Line items] |  |
Increase | € 72 | € 143

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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 increase (decrease) in a defined benefit obligation that would have been caused by an increase 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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