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Employees - Summary of the Assets, Liabilities and Surplus/(Deficit) Position of the Pension and Other Post-Employment Benefit Plans at the Balance Sheet Date (Detail) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of defined benefit plans [Line Items] |  |  |
Fair value of assets | € 22,361 | € 21,162 |
Present value of liabilities | (1,171) | (2,453) | € (1,473)
Other post-employment benefit plans [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Pension liability net of assets | (502) | (584) |
Other post-employment benefit plans [member] | Funded Pension Plans in Surplus [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Pension liability net of assets | 3 | 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 | (17) | (18) |
Other post-employment benefit plans [member] | Unfunded Pension Plans [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Pension liability net of assets | (488) | (569) |
Assets [member] | Other post-employment benefit plans [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Fair value of assets | 21 | 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 | 3 | 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 | 18 | 18 |
Liabilities [member] | Other post-employment benefit plans [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Present value of liabilities | (523) | (605) |
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 | (35) | (36) |
Aggregate Surplus [Member] | Other post-employment benefit plans [member] | Funded Pension Plans in Surplus [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Pension liability net of assets | 3 | 3 |
Pension Plans [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Pension liability net of assets | (59) | (2,589) |
Pension Plans [member] | Funded Pension Plans in Surplus [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Pension liability net of assets | 2,170 | 691 |
Pension Plans [member] | Funded Pension Plans in Deficit [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Pension liability net of assets | (1,208) | (2,145) |
Pension Plans [member] | Unfunded Pension Plans [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Pension liability net of assets | (1,021) | (1,135) |
Pension Plans [member] | Assets [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Fair value of assets | 22,361 | 21,162 |
Pension Plans [member] | Assets [member] | Funded Pension Plans in Surplus [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Fair value of assets | 19,302 | 6,524 |
Pension Plans [member] | Assets [member] | Funded Pension Plans in Deficit [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Fair value of assets | 3,059 | 14,638 |
Pension Plans [member] | Liabilities [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Present value of liabilities | (22,420) | (23,751) |
Pension Plans [member] | Liabilities [member] | Funded Pension Plans in Surplus [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Present value of liabilities | (17,132) | (5,833) |
Pension Plans [member] | Liabilities [member] | Funded Pension Plans in Deficit [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Present value of liabilities | (4,267) | (16,783) |
Pension Plans [member] | Aggregate Surplus [Member] | Funded Pension Plans in Surplus [member] |  |  |
Disclosure of defined benefit plans [Line Items] |  |  |
Pension liability net of assets | € 2,170 | € 691 |

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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 2016-01-13 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_57_a&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_57_a&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_57_a&doctype=Standard -URIDate 2016-03-31 + Details
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