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Results From Financial Transactions - Summary of Net Fair Value Change on for Account of Policyholder Financial Assets at Fair Value Through Profit or Loss (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial instruments at fair value through profit or loss [line items]      
Net fair value changes of financial assets at fair value through profit or loss € 33,188 € (11,326) € 20,524
Shares [member]      
Disclosure of financial instruments at fair value through profit or loss [line items]      
Net fair value changes of financial assets at fair value through profit or loss 4,591 (2,318) 2,372
Debt securities and money market investments [member]      
Disclosure of financial instruments at fair value through profit or loss [line items]      
Net fair value changes of financial assets at fair value through profit or loss 863 (421) 166
Unconsolidated investment funds [member]      
Disclosure of financial instruments at fair value through profit or loss [line items]      
Net fair value changes of financial assets at fair value through profit or loss 26,450 (8,158) 17,720
Derivatives [member]      
Disclosure of financial instruments at fair value through profit or loss [line items]      
Net fair value changes of financial assets at fair value through profit or loss € 1,284 € (429) € 265