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Segment Information - Summary of Investments (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1] | Dec. 31, 2017
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Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | € 145,976 | € 138,625 |  |  |
Investments for account of policyholders | 226,374 | 194,353 | [1] | € 194,063 |
Investments on balance sheet | 372,350 | 332,979 |  |  |
Off-balance sheet investments third parties | 524,547 | 470,963 |  |  |
Total revenue- generating investments | 896,897 | 803,942 |  |  |
Financial assets, excluding derivatives | 143,075 | 135,925 |  |  |
Investments in real estate | 2,901 | 2,700 |  |  | € 2,147
Total investments on balance sheet | 372,350 | 332,979 |  |  |
Investments in joint ventures | 1,983 | 1,745 | [1] | 1,712 | 1,712
Investments in associates | 363 | 327 | [1] | 308 | € 308
Other assets | 65,652 | 57,582 |  |  |
Assets | 440,348 | 392,633 | [1] | € 395,923 |
Available-for-sale financial assets [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 89,404 | 84,675 |  |  |
Loans [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 44,591 | 42,653 |  |  |
Financial assets at fair value through profit or loss [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 234,867 | 202,339 |  |  |
Investments in real estate [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments in real estate | 3,487 | 3,312 |  |  |
Shares [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 2,221 | 2,161 |  |  |
Investments for account of policyholders | 25,288 | 20,640 |  |  |
Financial assets, excluding derivatives | 2,221 | 2,161 |  |  |
Debt securities [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 86,853 | 81,253 |  |  |
Investments for account of policyholders | 20,744 | 20,441 |  |  |
Financial assets, excluding derivatives | 86,853 | 81,253 |  |  |
Loans [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 44,591 | 42,653 |  |  |
Other financial asset [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 9,410 | 9,858 |  |  |
Investments for account of policyholders | 9,716 | 8,861 |  |  |
Real estate [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 2,901 | 2,700 |  |  |
Investments for account of policyholders | 586 | 612 |  |  |
Unconsolidated investment funds [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments for account of policyholders | 170,039 | 143,800 |  |  |
Americas [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 75,076 | 71,056 |  |  |
Investments for account of policyholders | 107,963 | 95,343 |  |  |
Investments on balance sheet | 183,039 | 166,399 |  |  |
Off-balance sheet investments third parties | 220,039 | 204,184 |  |  |
Total revenue- generating investments | 403,078 | 370,583 |  |  |
Total investments on balance sheet | 183,039 | 166,399 |  |  |
Investments in joint ventures |  | 1 |  |  |
Investments in associates | 79 | 72 |  |  |
Other assets | 36,899 | 37,674 |  |  |
Assets | 220,017 | 204,145 |  |  |
Americas [member] | Available-for-sale financial assets [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 59,899 | 55,921 |  |  |
Americas [member] | Loans [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 10,922 | 9,945 |  |  |
Americas [member] | Financial assets at fair value through profit or loss [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 111,565 | 100,002 |  |  |
Americas [member] | Investments in real estate [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments in real estate | 653 | 530 |  |  |
Americas [member] | Shares [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 499 | 532 |  |  |
Americas [member] | Debt securities [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 54,970 | 51,681 |  |  |
Investments for account of policyholders | 877 | 1,716 |  |  |
Americas [member] | Loans [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 10,922 | 9,945 |  |  |
Americas [member] | Other financial asset [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 8,032 | 8,367 |  |  |
Investments for account of policyholders | 161 | 79 |  |  |
Americas [member] | Real estate [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 653 | 530 |  |  |
Americas [member] | Unconsolidated investment funds [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments for account of policyholders | 106,926 | 93,548 |  |  |
The Netherlands [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 59,983 | 57,738 |  |  |
Investments for account of policyholders | 25,491 | 23,767 |  |  |
Investments on balance sheet | 85,474 | 81,505 |  |  |
Off-balance sheet investments third parties | 4,802 | 3,339 |  |  |
Total revenue- generating investments | 90,276 | 84,844 |  |  |
Total investments on balance sheet | 85,474 | 81,505 |  |  |
Investments in joint ventures | 1,159 | 1,001 |  |  |
Investments in associates | 106 | 85 |  |  |
Other assets | 21,983 | 13,491 |  |  |
Assets | 108,722 | 96,083 |  |  |
The Netherlands [member] | Available-for-sale financial assets [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 19,591 | 19,974 |  |  |
The Netherlands [member] | Loans [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 33,460 | 32,536 |  |  |
The Netherlands [member] | Financial assets at fair value through profit or loss [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 30,193 | 26,846 |  |  |
The Netherlands [member] | Investments in real estate [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments in real estate | 2,229 | 2,150 |  |  |
The Netherlands [member] | Shares [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 1,443 | 1,412 |  |  |
Investments for account of policyholders | 8,490 | 7,403 |  |  |
The Netherlands [member] | Debt securities [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 22,773 | 21,586 |  |  |
Investments for account of policyholders | 11,652 | 11,283 |  |  |
The Netherlands [member] | Loans [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 33,460 | 32,536 |  |  |
The Netherlands [member] | Other financial asset [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 78 | 54 |  |  |
Investments for account of policyholders | 4,653 | 4,022 |  |  |
The Netherlands [member] | Real estate [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 2,229 | 2,150 |  |  |
The Netherlands [member] | Unconsolidated investment funds [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments for account of policyholders | 695 | 1,059 |  |  |
United Kingdom [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 2,034 | 2,114 |  |  |
Investments for account of policyholders | 91,848 | 73,958 |  |  |
Investments on balance sheet | 93,882 | 76,072 |  |  |
Off-balance sheet investments third parties | 123,904 | 106,347 |  |  |
Total revenue- generating investments | 217,786 | 182,419 |  |  |
Total investments on balance sheet | 93,882 | 76,072 |  |  |
Investments in associates | 9 | 8 |  |  |
Other assets | 3,764 | 3,104 |  |  |
Assets | 97,655 | 79,184 |  |  |
United Kingdom [member] | Available-for-sale financial assets [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 1,556 | 1,459 |  |  |
United Kingdom [member] | Financial assets at fair value through profit or loss [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 91,740 | 74,001 |  |  |
United Kingdom [member] | Investments in real estate [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments in real estate | 586 | 612 |  |  |
United Kingdom [member] | Shares [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 17 | 3 |  |  |
Investments for account of policyholders | 16,583 | 13,044 |  |  |
United Kingdom [member] | Debt securities [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 1,055 | 1,005 |  |  |
Investments for account of policyholders | 8,043 | 7,259 |  |  |
United Kingdom [member] | Other financial asset [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 962 | 1,105 |  |  |
Investments for account of policyholders | 4,898 | 4,748 |  |  |
United Kingdom [member] | Real estate [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments for account of policyholders | 586 | 612 |  |  |
United Kingdom [member] | Unconsolidated investment funds [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments for account of policyholders | 61,738 | 48,296 |  |  |
Southern & Eastern Europe [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 1,711 | 1,660 |  |  |
Investments for account of policyholders | 994 | 1,187 |  |  |
Investments on balance sheet | 2,704 | 2,847 |  |  |
Off-balance sheet investments third parties | 5,461 | 5,851 |  |  |
Total revenue- generating investments | 8,166 | 8,698 |  |  |
Total investments on balance sheet | 2,704 | 2,847 |  |  |
Investments in joint ventures | 476 | 472 |  |  |
Investments in associates |  | 5 |  |  |
Other assets | 468 | 494 |  |  |
Assets | 3,648 | 3,819 |  |  |
Southern & Eastern Europe [member] | Available-for-sale financial assets [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 1,570 | 1,483 |  |  |
Southern & Eastern Europe [member] | Loans [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 118 | 143 |  |  |
Southern & Eastern Europe [member] | Financial assets at fair value through profit or loss [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 997 | 1,200 |  |  |
Southern & Eastern Europe [member] | Investments in real estate [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments in real estate | 19 | 21 |  |  |
Southern & Eastern Europe [member] | Shares [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 74 | 74 |  |  |
Investments for account of policyholders | 218 | 198 |  |  |
Southern & Eastern Europe [member] | Debt securities [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 1,497 | 1,417 |  |  |
Investments for account of policyholders | 173 | 183 |  |  |
Southern & Eastern Europe [member] | Loans [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 118 | 143 |  |  |
Southern & Eastern Europe [member] | Other financial asset [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 3 | 5 |  |  |
Investments for account of policyholders | 4 | 11 |  |  |
Southern & Eastern Europe [member] | Real estate [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 19 | 21 |  |  |
Southern & Eastern Europe [member] | Unconsolidated investment funds [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments for account of policyholders | 598 | 795 |  |  |
Asia [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 6,662 | 5,720 |  |  |
Investments for account of policyholders | 82 | 103 |  |  |
Investments on balance sheet | 6,745 | 5,823 |  |  |
Off-balance sheet investments third parties | 1,001 | 2,818 |  |  |
Total revenue- generating investments | 7,746 | 8,641 |  |  |
Total investments on balance sheet | 6,745 | 5,823 |  |  |
Investments in joint ventures | 192 | 152 |  |  |
Investments in associates | 28 | 17 |  |  |
Other assets | 2,483 | 2,662 |  |  |
Assets | 9,448 | 8,654 |  |  |
Asia [member] | Available-for-sale financial assets [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 6,602 | 5,686 |  |  |
Asia [member] | Loans [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 42 | 16 |  |  |
Asia [member] | Financial assets at fair value through profit or loss [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 100 | 121 |  |  |
Asia [member] | Shares [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 11 | 7 |  |  |
Asia [member] | Debt securities [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 6,465 | 5,526 |  |  |
Asia [member] | Loans [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 42 | 16 |  |  |
Asia [member] | Other financial asset [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 145 | 170 |  |  |
Asia [member] | Unconsolidated investment funds [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments for account of policyholders | 82 | 103 |  |  |
Asset management [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 266 | 181 |  |  |
Investments on balance sheet | 266 | 181 |  |  |
Off-balance sheet investments third parties | 170,158 | 149,197 |  |  |
Total revenue- generating investments | 170,424 | 149,378 |  |  |
Total investments on balance sheet | 266 | 181 |  |  |
Investments in joint ventures | 153 | 119 |  |  |
Investments in associates | 129 | 131 |  |  |
Other assets | 292 | 336 |  |  |
Assets | 840 | 767 |  |  |
Asset management [member] | Available-for-sale financial assets [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 153 | 131 |  |  |
Asset management [member] | Financial assets at fair value through profit or loss [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 113 | 50 |  |  |
Asset management [member] | Shares [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 5 | 4 |  |  |
Asset management [member] | Debt securities [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 93 | 36 |  |  |
Asset management [member] | Other financial asset [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 168 | 142 |  |  |
Holding and other activities [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 244 | 157 |  |  |
Investments on balance sheet | 244 | 157 |  |  |
Total revenue- generating investments | 244 | 157 |  |  |
Total investments on balance sheet | 244 | 157 |  |  |
Investments in joint ventures | 3 |  |  |  |
Investments in associates | 21 | 8 |  |  |
Other assets | 32,611 | 28,548 |  |  |
Assets | 32,879 | 28,713 |  |  |
Holding and other activities [member] | Available-for-sale financial assets [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 32 | 21 |  |  |
Holding and other activities [member] | Loans [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 48 | 12 |  |  |
Holding and other activities [member] | Financial assets at fair value through profit or loss [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | 164 | 123 |  |  |
Holding and other activities [member] | Shares [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 173 | 128 |  |  |
Holding and other activities [member] | Debt securities [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 1 | 3 |  |  |
Holding and other activities [member] | Loans [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 48 | 12 |  |  |
Holding and other activities [member] | Other financial asset [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 21 | 14 |  |  |
Eliminations [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments general account | 0 | 0 |  |  |
Investments for account of policyholders | (4) | (5) |  |  |
Investments on balance sheet | (4) | (5) |  |  |
Off-balance sheet investments third parties | (818) | (774) |  |  |
Total revenue- generating investments | (822) | (778) |  |  |
Total investments on balance sheet | (4) | (5) |  |  |
Investments in associates | (10) |  |  |  |
Other assets | (32,848) | (28,727) |  |  |
Assets | (32,862) | (28,732) |  |  |
Eliminations [member] | Financial assets at fair value through profit or loss [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Financial assets, excluding derivatives | (4) | (5) |  |  |
Eliminations [member] | Shares [member] |  |  |  |  |
Disclosure of summarized investment per segment [line items] |  |  |  |  |
Investments for account of policyholders | € (4) | € (5) |  |  |
[1] | Amounts have been restated to reflect voluntary changes in accounting policies related to liability adequacy testing that was adopted by Aegon effective January 1, 2019. Refer to note 2.1.2 Voluntary changes in accounting policies for details about this change.

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35H&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35I&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35M&doctype=Standard -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35N&doctype=Standard -URIDate 2019-03-27 + Details
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