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Employees - Summary of Assets, Liabilities and Surplus/ (Deficit) Position of Pension and Other Post-Employment Benefit Plans at Balance Sheet Date (Detail) - EUR (€) € in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of defined benefit plans [line items] |  |
Fair value of assets | € 20,867 | € 22,361
Other Post-Employment Benefit Plans [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Pension liability net of assets | (453) | (502)
Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Surplus [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Pension liability net of assets | 1 | 3
Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Deficit [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Pension liability net of assets | (18) | (17)
Other Post-Employment Benefit Plans [Member] | Unfunded Pension Plans [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Pension liability net of assets | (436) | (488)
Assets [Member] | Other Post-Employment Benefit Plans [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair value of assets | 13 | 21
Assets [Member] | Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Surplus [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair value of assets | 1 | 3
Assets [Member] | Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Deficit [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair value of assets | 12 | 18
Liabilities [Member] | Other Post-Employment Benefit Plans [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Present value of liabilities | (466) | (523)
Liabilities [Member] | Other Post-Employment Benefit Plans [Member] | Funded Pension Plans in Deficit [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Present value of liabilities | (30) | (35)
Pension Plans [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Pension liability net of assets | (421) | (59)
Pension Plans [Member] | Funded Pension Plans in Surplus [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Pension liability net of assets | 1,727 | 2,170
Pension Plans [Member] | Funded Pension Plans in Deficit [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Pension liability net of assets | (1,191) | (1,208)
Pension Plans [Member] | Unfunded Pension Plans [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Pension liability net of assets | (957) | (1,021)
Pension Plans [Member] | Assets [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair value of assets | 20,867 | 22,361
Pension Plans [Member] | Assets [Member] | Funded Pension Plans in Surplus [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair value of assets | 17,909 | 19,302
Pension Plans [Member] | Assets [Member] | Funded Pension Plans in Deficit [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair value of assets | 2,958 | 3,059
Pension Plans [Member] | Liabilities [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Present value of liabilities | (21,288) | (22,420)
Pension Plans [Member] | Liabilities [Member] | Funded Pension Plans in Surplus [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Present value of liabilities | (16,182) | (17,132)
Pension Plans [Member] | Liabilities [Member] | Funded Pension Plans in Deficit [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Present value of liabilities | € (4,149) | € (4,267)

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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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