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Pensions and Other Post-employment Benefit Obligations - Summary of Sensitivity Analysis on Defined Benefit Obligations (Detail) € in Millions | Dec. 31, 2017 EUR (€)
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Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Total sensitivity on Defined Benefit Obligations, increase in discount rates | € (68)
Total sensitivity on Defined Benefit Obligations, decrease in discount rates | 76
France [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Total sensitivity on Defined Benefit Obligations, increase in discount rates | (9)
Total sensitivity on Defined Benefit Obligations, decrease in discount rates | 10
Germany [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Total sensitivity on Defined Benefit Obligations, increase in discount rates | (9)
Total sensitivity on Defined Benefit Obligations, decrease in discount rates | 10
Switzerland [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Total sensitivity on Defined Benefit Obligations, increase in discount rates | (20)
Total sensitivity on Defined Benefit Obligations, decrease in discount rates | 23
United States [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Total sensitivity on Defined Benefit Obligations, increase in discount rates | (30)
Total sensitivity on Defined Benefit Obligations, decrease in discount rates | € 33

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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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