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Business Combinations - Additional Information (Detail) € in Millions, ¥ in Millions, £ in Millions, $ in Millions, zł in Billions |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |
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Jan. 29, 2020 EUR (€) | Jan. 29, 2020 JPY (¥) | Jan. 08, 2019 EUR (€) | Aug. 15, 2018 EUR (€) | Aug. 07, 2018 USD ($) | Jul. 03, 2018 EUR (€) | Apr. 03, 2018 EUR (€) | Apr. 03, 2018 GBP (£) | Nov. 01, 2017 EUR (€) | Jun. 28, 2017 EUR (€) | Jun. 28, 2017 USD ($) | Jan. 01, 2017 EUR (€) | Jan. 01, 2017 GBP (£) | Aug. 11, 2016 | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 EUR (€) | Sep. 10, 2018 EUR (€) | Dec. 28, 2017 USD ($) | Jun. 30, 2017 EUR (€) | Jun. 30, 2017 PLN (zł) | Jan. 01, 2017 GBP (£)
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 89 |  |  |  |  |  |  |  |
Fair value of net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 139,834 |  |  | € 148,570 |  |  |  |  |
Net assets transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1,900 | zł 8.1 |
Business disposal gain (loss) |  |  | € 70 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Americas [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business disposal gain (loss) |  |  |  |  |  |  |  |  |  | € 231 | $ 250 |  |  |  |  | € 905 | $ 979 |  |  |  |  |  |
Reinsured liabilities | $ |  |  |  |  |  |  |  |  |  |  | $ 14,000 |  |  |  |  |  |  |  |  |  |  |  |
Loss on the reinsurance transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,675 | 1,813 |  |  |  |  |  |
Revaluation reserves and cash flow hedging reserve |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 941 | 1,018 |  |  |  |  |  |
Gains on sale of certain assets carried at amortized cost backing the insurance liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87 | 94 |  |  |  |  |  |
Other expenses related to the transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 26 | $ 28 |  |  |  |  |  |
CZ [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business sold, business combination |  |  | 155 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underlying earnings before tax from cobined operations |  |  | € 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
JP [member] | Disposal of major subsidiary [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business disposal gain (loss) | € 51 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business sold, business combination | € 153 | ¥ 18,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of interest percentage | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cofunds Ltd [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination consideration transferred |  |  |  |  |  |  |  |  |  |  |  | € 171 |  |  |  |  |  |  |  |  |  |  | £ 147
Fair value of net assets |  |  |  |  |  |  |  |  |  |  |  | 116 |  |  |  |  |  |  |  |  |  |  | 99
Customer intangibles recoginsed |  |  |  |  |  |  |  |  |  |  |  | 29 |  |  |  |  |  |  |  |  |  |  | £ 25
Goodwill recognised |  |  |  |  |  |  |  |  |  |  |  | 56 | £ 48 |  |  |  |  |  |  |  |  |  |
Investments not recognised |  |  |  |  |  |  |  |  |  |  |  | € 96,000 | £ 82,000 |  |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 01, 2017 |  |  |  |  |  |  |  |  |
Aegon Ireland Plc [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds of the transaction |  |  |  |  |  |  | € 202 | £ 177 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business disposal gain (loss) |  |  |  |  |  |  | (93) | (81) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount reclassified from other comprehensive income to income statement during disposal |  |  |  |  |  |  | € 36 | £ 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unirobe Mees Groep (UMG) [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration received from sale of business |  |  |  |  |  |  |  |  | € 295 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain loss on disposal of Investment |  |  |  |  |  |  |  |  | 208 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated decrease on future underlying earnings before tax as compared to 2017 levels |  |  |  |  |  |  |  |  | € 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transamerica Corporation [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsured liabilities | $ |  |  |  |  | $ 700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750 |  |  |
Benefits from capital positions | $ |  |  |  |  | $ 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Banco Santander [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront consideration paid |  |  |  |  |  | € 215 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional upfront consideration payable |  |  |  |  |  | € 75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional upfront consideration payment period |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NN Group [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business disposal gain (loss) |  |  |  | € 80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business sold, business combination |  |  |  | € 155 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underlying earnings before tax from cobined operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 17 |  |  |  |  |  |  |  |
Robidus [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage acquired by the entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94.40% |  |  |  |
Business combination consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 103 |  |  |  |
Fair value of the net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 |  |  |  |
Goodwill, business combination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 85 |  |  |  |

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- Definition The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B64 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64_f&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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- Definition The increase in intangible assets and goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2019-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The cash flows from (used in) insurance contracts. [Refer: Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph 37 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition The date on which the acquirer obtains control of the acquiree in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B64 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64_b&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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- Definition The gain (loss) arising from the derecognition of financial assets measured at amortised cost. [Refer: Financial assets at amortised cost] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 82 -Subparagraph aa -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_82_aa&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The gains (losses) recognised in profit or loss on the entity's purchase of reinsurance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph 37 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_37_b_i&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition The amount recognised as of the business combination's acquisition date for goodwill. [Refer: Goodwill; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B64 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64&doctype=Appendix&subtype=B -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph IE72 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_IE72&doctype=Illustrative%20Examples -URIDate 2019-03-27 + Details
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- Definition The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2019-01-01 -Paragraph B64 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64_c&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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- Definition The amount of proceeds recognised from the transfer of financial assets during the part of the reporting period within which the greatest transfer activity took place when the total amount of proceeds from the transfer activity (that qualifies for derecognition) is not evenly distributed throughout the reporting period. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 42G -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_42G_c_iii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of reinsurance contracts held that are liabilities. [Refer: Liabilities; Reinsurance contracts held [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2021-01-01 -Name IFRS -Number 17 -IssueDate 2019-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2019-en-r&anchor=para_78_d&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2021-01-01 -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph ma -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_ma&doctype=Standard -URIDate 2019-03-27 + Details
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