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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
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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

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