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Shareholders' Equity - Summary of Movements in the Number of Treasury Common Shares (Detail) - EUR (€) shares in Thousands, € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of treasury shares [line items] |  |  |
At January 1 | € 337 | € 325 |
At December 31 | 281 | 337 | € 325
Common shares B [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
At January 1 | 2 | 2 |
At December 31 | € 3 | € 2 | € 2
Aegon N. V. and subsidiaries [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
At January 1 | 61,418 | 64,488 | 47,473
At December 31 | 65,540 | 61,418 | 64,488
At January 1 | € 326 | € 314 | € 178
At December 31 | € 269 | € 326 | € 314
Aegon N. V. and subsidiaries [member] | Common shares B [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
At January 1 | 13,856 | 15,346 | 17,325
At December 31 | 25,310 | 13,856 | 15,346
At January 1 | € 2 | € 2 | € 2
At December 31 | € 3 | € 2 | € 2
Aegon N. V. and subsidiaries [member] | Sale: transactions, average price EUR 5.10 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares | (3,657) |  |
Sale: transactions, price average, Amount | € (19) |  |
Aegon N. V. and subsidiaries [member] | Sale: 1 transaction, average price EUR 5.25 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares | (32,874) |  |
Sale: transactions, price average, Amount | € (173) |  |
Aegon N. V. and subsidiaries [member] | Purchase: 1 transaction, average price EUR 4.52 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares | 32,874 |  |
Purchase: transactions, average price, Amount | € 149 |  |
Aegon N. V. and subsidiaries [member] | Sale: 1 transaction, average price EUR 5.16 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares | (35,370) |  |
Sale: transactions, price average, Amount | € (183) |  |
Aegon N. V. and subsidiaries [member] | Purchase: 1 transaction, average price EUR 3.89 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares | 43,150 |  |
Purchase: transactions, average price, Amount | € 168 |  |
Aegon N. V. and subsidiaries [member] | Sale Transactions Price Average 3.76 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  | (3,070) |
Sale: transactions, price average, Amount |  | € (12) |
Aegon N. V. and subsidiaries [member] | Sale Transactions Price Average 4.62 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  | (21,954) |
Sale: transactions, price average, Amount |  | € (101) |
Aegon N. V. and subsidiaries [member] | Purchase Transactions Average Price 5.34 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  | 21,954 |
Purchase: transactions, average price, Amount |  | € 117 |
Aegon N. V. and subsidiaries [member] | Sale Transactions Average Price 5.09 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  | (24,134) |
Sale: transactions, price average, Amount |  | € (123) |
Aegon N. V. and subsidiaries [member] | Purchase Transactions Average Price 5.43 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  | 24,134 |
Purchase: transactions, average price, Amount |  | € 131 |
Aegon N. V. and subsidiaries [member] | Sale transactions price average 3.44 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  |  | (4,085)
Sale: transactions, price average, Amount |  |  | € (14)
Aegon N. V. and subsidiaries [member] | Sale transactions price average 3.68 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  |  | (26,916)
Sale: transactions, price average, Amount |  |  | € (99)
Aegon N. V. and subsidiaries [member] | Sale transactions price average 3.77 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  |  | (3,849)
Sale: transactions, price average, Amount |  |  | € (14)
Aegon N. V. and subsidiaries [member] | Purchase transactions average price 5.09 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  |  | 51,865
Purchase: transactions, average price, Amount |  |  | € 263
Aegon N. V. and subsidiaries [member] | Sale Transactions Price Average 0.12 [member] | Common shares B [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares | (1,774) |  |
Aegon N. V. and subsidiaries [member] | Purchase transactions average price 0.10 [member] | Common shares B [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares | 13,227 |  |
Purchase: transactions, average price, Amount | € 1 |  |
Aegon N. V. and subsidiaries [member] | Sale: 1 transaction, average price EUR 0.11 [member] | Common shares B [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  | (1,489) | (1,979)
Aegon N. V. and subsidiaries [member] | Sale transactions price average 0.11 [member] | Common shares B [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  |  | (13,043)
Sale: transactions, price average, Amount |  |  | € (1)
Aegon N. V. and subsidiaries [member] | Purchase transactions average price 0.13 [member] | Common shares B [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  |  | 13,043
Purchase: transactions, average price, Amount |  |  | € 2
Aegon N.V [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
At January 1 | 76,419 |  |
At December 31 | 91,893 | 76,419 |
At January 1 | € 337 |  |
At December 31 | € 281 | € 337 |
Aegon N.V [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
At January 1 | 61,418 | 64,488 |
At December 31 | 65,540 | 61,418 | 64,488
At January 1 | € 326 | € 314 |
At December 31 | € 269 | € 326 | € 314
Aegon N.V [member] | Common shares B [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
At January 1 | 13,856 | 15,346 |
At December 31 | 25,310 | 13,856 | 15,346
At January 1 | € 2 | € 2 |
At December 31 | € 3 | € 2 | € 2
Aegon N.V [member] | Sale: transactions, average price EUR 5.10 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares | (3,657) |  |
Sale: transactions, price average, Amount | € (19) |  |
Aegon N.V [member] | Sale: 1 transaction, average price EUR 5.25 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares | (32,874) |  |
Sale: transactions, price average, Amount | € (173) |  |
Aegon N.V [member] | Purchase: 1 transaction, average price EUR 4.52 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares | 32,874 |  |
Purchase: transactions, average price, Amount | € 149 |  |
Aegon N.V [member] | Sale: 1 transaction, average price EUR 5.16 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares | (35,370) |  |
Sale: transactions, price average, Amount | € (183) |  |
Aegon N.V [member] | Purchase: 1 transaction, average price EUR 3.89 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares | 43,150 |  |
Purchase: transactions, average price, Amount | € 168 |  |
Aegon N.V [member] | Sale Transactions Price Average 3.76 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  | (3,070) |
Sale: transactions, price average, Amount |  | € (12) |
Aegon N.V [member] | Sale Transactions Price Average 4.62 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  | (21,954) |
Sale: transactions, price average, Amount |  | € (101) |
Aegon N.V [member] | Purchase Transactions Average Price 5.34 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  | 21,954 |
Purchase: transactions, average price, Amount |  | € 117 |
Aegon N.V [member] | Sale Transactions Average Price 5.09 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  | (24,134) |
Sale: transactions, price average, Amount |  | € (123) |
Aegon N.V [member] | Purchase Transactions Average Price 5.43 [member] | Common Share [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  | 24,134 |
Purchase: transactions, average price, Amount |  | € 131 |
Aegon N.V [member] | Sale: 1 transaction, average price EUR 0.11 [member] | Common shares B [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares |  | (1,489) |
Aegon N.V [member] | Sale: 1 transaction, average price EUR 0.12 [member] | Common shares B [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares | (1,774) |  |
Aegon N.V [member] | Buy: 1 transaction, average price EUR 0.10 [member] | Common shares B [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Purchase/ sale: transactions, average price, Number of shares | 13,227 |  |
Purchase: transactions, average price, Amount | € 1 |  |

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