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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
	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

X

- Definition

Decrease in premium income.

+ References

No definition available.

+ Details

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- Definition

Disclosure of insurance premium revenue.

+ References

No definition available.

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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

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- Details

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