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Premium Income and Premiums Paid to Reinsurers - Additional Information (Detail) - Life insurance general account [member] - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of insurance premium revenue [line items] |  |  |
Total decrease in premium income | € 1,178 | € 3,510 |
United Kingdom [member] |  |  |
Disclosure of insurance premium revenue [line items] |  |  |
Reduction in upgraded Life insurance policies | € 1,777 | € 3,439 | € 5,139

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- Definition Decrease in premium income. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of insurance premium revenue. + References No definition available. + Details
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- Definition The amount of expense arising from insurance contracts. [Refer: Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph 37 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Period Type: |