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Defined Benefit Plans - Summary of Movements of Defined Benefit Plans (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [Line Items] |  |  |
Beginning Balance | € 3,989 | € 3,950 |
Defined benefit expenses | 244 | 206 | € 262
Current year service cost | 157 | 131 | 158
Interest expense | 89 | 96 | 109
Remeasurements of the defined benefit obligations: |  |  |
Past service cost | (1) | (21) | (6)
Contributions paid | (298) | (234) |
Benefits paid | (118) | (118) |
Net exchange differences | 18 | 47 |
Other | (88) | 5 |
Ending Balance | 4,359 | 3,989 | 3,950
Defined benefit plans [member] |  |  |
Remeasurements of the defined benefit obligations: |  |  |
Remeasurements of defined benefit plans | 612 | 134 |
Commissions and expenses [member] | Present value of defined benefit obligation [member] |  |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |  |
Beginning Balance | 7,514 | 7,572 |
Current year service cost | 157 | 131 |
Interest expense | 221 | 213 |
Remeasurements of the defined benefit obligations: |  |  |
- Actuarial gains and losses arising from changes in demographic assumptions | 40 | (28) |
- Actuarial gains and losses arising from changes in financial assumptions | 1,126 | (102) |
Past service cost | (1) | (21) |
Contributions by plan participants | 8 | 11 |
Benefits paid | (353) | (409) |
Net exchange differences | 144 | 144 |
Other | (76) | 5 |
Ending Balance | 8,779 | 7,514 | 7,572
Commissions and expenses [member] | Defined benefit plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |  |
Beginning Balance | 3,525 | 3,622 |
Interest expense | 133 | 117 |
Remeasurements of the defined benefit obligations: |  |  |
Remeasurements of defined benefit plans | 566 | (264) |
Contributions by employer | 306 | 245 |
Benefits paid | (235) | (291) |
Net exchange differences | 126 | 96 |
Ending Balance | 4,420 | 3,525 | 3,622
Retirement Benefit Plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |  |
Beginning Balance | 3,714 | 3,657 |
Defined benefit expenses | 227 | 192 |
Current year service cost | 148 | 121 | 148
Interest expense | 80 | 87 | 99
Remeasurements of the defined benefit obligations: |  |  |
Past service cost | (1) | (16) | (5)
Remeasurements of defined benefit plans | 607 | 157 |
Contributions paid | (298) | (234) |
Benefits paid | (100) | (99) |
Net exchange differences | 14 | 37 |
Other | (89) | 5 |
Ending Balance | 4,076 | 3,714 | 3,657
Other Post Employment Benefit Plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [Line Items] |  |  |
Beginning Balance | 275 | 293 |
Defined benefit expenses | 17 | 13 |
Current year service cost | 8 | 10 | 11
Interest expense | 9 | 8 | 10
Remeasurements of the defined benefit obligations: |  |  |
Past service cost |  | (5) | (1)
Remeasurements of defined benefit plans | 5 | (23) |
Benefits paid | (18) | (19) |
Net exchange differences | 4 | 11 |
Ending Balance | € 283 | € 275 | € 293

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_c_ii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2019-03-27 + Details
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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 2019-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_f&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [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 2019-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_f&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan. [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 2019-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_f&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [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 2019-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_d&doctype=Standard -URIDate 2019-03-27 + Details
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