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Premium Income and Premiums Paid to Reinsurers - Summary of Premiums Paid to Reinsurers- 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 net, gross and reinsurer's share for amounts arising from insurance contracts [line items]      
Expenses arising from reinsurance held € 2,434 € 2,663 € 3,431
Life insurance general account [member]      
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [line items]      
Expenses arising from reinsurance held 2,276 2,500 3,214
Non-life insurance [member]      
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [line items]      
Expenses arising from reinsurance held 158 163 217
Accident and health insurance [member]      
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [line items]      
Expenses arising from reinsurance held 138 152 205
General insurance [member]      
Disclosure of net, gross and reinsurer's share for amounts arising from insurance contracts [line items]      
Expenses arising from reinsurance held € 19 € 11 € 13