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Premium Income and Premiums Paid to Reinsurers - Summary of Premium Income (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of insurance premium revenue [line items]      
Income arising from insurance contracts € 18,138 € 19,316 € 22,826
Life insurance general account [member]      
Disclosure of insurance premium revenue [line items]      
Income arising from insurance contracts 15,926 16,969 19,952
Non-life insurance [member]      
Disclosure of insurance premium revenue [line items]      
Income arising from insurance contracts 2,212 2,346 2,874
Accident and health insurance [member]      
Disclosure of insurance premium revenue [line items]      
Income arising from insurance contracts 1,823 1,979 2,511
General insurance [member]      
Disclosure of insurance premium revenue [line items]      
Income arising from insurance contracts € 390 € 367 € 363