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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)