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Policyholder Claims and Benefits - Summary of Policyholder Claims and Benefits (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detail information about policyholder claims and benefits paid [line items]      
Change in valuation of liabilities for insurance contracts € 30,620 € (2,639) € 22,741
Other (50) 9 (34)
Total 56,797 10,557 45,599
Life insurance general account [member]      
Disclosure of detail information about policyholder claims and benefits paid [line items]      
Benefits and claims paid life 18,824 19,673 23,634
Non-life insurance [member]      
Disclosure of detail information about policyholder claims and benefits paid [line items]      
Benefits and claims paid life 1,635 1,658 1,903
Investment contracts 1 [member]      
Disclosure of detail information about policyholder claims and benefits paid [line items]      
Change in valuation of liabilities for investment contracts € 5,768 € (8,143) € (2,644)