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v3.19.1

Employees - Schedule of Cash Flow in Respect of Pensions and Similar Post-employment Benefits (Detail) - EUR (€) € in Millions | 121 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |
Group cash flow in respect of pensions and similar benefits |  | € 561 | € 1,300 | € 699
Funded Plans [Member] |  |  |  |
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |
Defined benefit |  | 238 | 954 | 355
Defined contributions |  | 179 | 195 | 187
Unfunded Plans [Member] |  |  |  |
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |
Defined benefit |  | € 144 | € 151 | € 157
Future estimate [member] |  |  |  |
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |
Group cash flow in respect of pensions and similar benefits | € 565 |  |  |
Future estimate [member] | Funded Plans [Member] |  |  |  |
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |
Defined benefit | 230 |  |  |
Defined contributions | 185 |  |  |
Future 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 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 35 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2017-03-01&anchor=para_35_b_i&doctype=Standard -URIDate 2017-03-09 + 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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