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Employees - Summary of Cash Flow in Respect of Pensions and Similar Post-employment Benefits (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |
Group cash flow in respect of pensions and similar benefits |  | € 1,300 | € 699 | € 710
Funded Plans [member] |  |  |  |
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |
Defined benefit |  | 954 | 355 | 356
Defined contributions |  | 195 | 187 | 197
Unfunded Plans [member] |  |  |  |
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |
Defined benefit |  | € 151 | € 157 | € 157
Estimate [member] |  |  |  |
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |
Group cash flow in respect of pensions and similar benefits | € 600 |  |  |
Estimate [member] | Funded Plans [member] |  |  |  |
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |
Defined benefit | 245 |  |  |
Defined contributions | 205 |  |  |
Estimate [member] | Unfunded Plans [member] |  |  |  |
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |
Defined benefit | € 150 |  |  |

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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2016-01-13 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_141_f&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of employer contributions to retirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2016-01-13 -Paragraph 35 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2016-03-30&anchor=para_35_b_i&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Cash flow in respect of pensions and similar benefits. + References No definition available. + Details
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- Definition Disclosure of employee benefit plan. + References No definition available. + Details
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