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Employees - Schedule 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, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |  |
Group cash flow in respect of pensions and similar benefits |  |  | € 601 | € 594 | € 561
Funded Plans [Member] |  |  |  |  |
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |  |
Defined benefit | [1] |  | 266 | 244 | 238
Defined contributions |  |  | 203 | 193 | 179
Unfunded Plans [Member] |  |  |  |  |
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |  |
Defined benefit |  |  | € 132 | € 157 | € 144
Future estimate [member] |  |  |  |  |
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |  |
Group cash flow in respect of pensions and similar benefits |  | € 640 |  |  |
Future estimate [member] | Funded Plans [Member] |  |  |  |  |
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |  |
Defined benefit | [1] | 285 |  |  |
Defined contributions |  | 220 |  |  |
Future estimate [member] | Unfunded Plans [Member] |  |  |  |  |
Disclosure of Employee Benefit Plan [Line Items] |  |  |  |  |
Defined benefit |  | € 135 |  |  |
[1] | Following the conclusion of the 2019 Funding valuation of the US Unicare Pension Plan, the Group contributed $100 million into the plan in 2020. Deficit contributions to the US Pension plan are expected to be nil for the following few years.

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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 2020-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_f&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 35 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2020-en-r&anchor=para_35_b_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Cash flow in respect of pensions and similar benefits. + References No definition available. + Details
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