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Results From Financial Transactions - Summary of Financial Transactions Results (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of result from financial transaction [Line Items] |  |  |
Net fair value change of general account financial investments at fair value through profit or loss, other than derivatives | € 279 | € (79) | € 232
Realized gains and (losses) on financial investments | 399 | (92) | 431
Gains and (losses) on investments in real estate | 317 | 261 | 193
Net fair value change of derivatives | 1,130 | (545) | (1,159)
Net fair value change on account of policyholder financial assets at fair value through profit or loss | 33,188 | (11,326) | 20,524
Net fair value change on investments in real estate for account of policyholders | (18) | 5 | 38
Net foreign currency gains and (losses) | 77 | 44 | (20)
Net fair value change on borrowings and other financial liabilities | 15 | 29 | 10
Realized gains and (losses) on repurchased debt |  | 1 | 1
Total | 35,386 | (11,701) | € 20,250
Aegon N.V [member] |  |  |
Disclosure of result from financial transaction [Line Items] |  |  |
Net fair value change of derivatives | (22) | (8) |
Net foreign currency gains and (losses) | 3 | 3 |
Net fair value change on borrowings and other financial liabilities | 4 | 4 |
Total | € (15) | € (1) |

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