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Policyholder Claims and Benefits - Additional Information (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Claims And Benefits Paid [abstract]
Fair value changes on for account of policyholder financial assets	€ 33,188	€ (11,326)	€ 20,524
Increase of technical provisions for life insurance contracts	€ 2,431	€ 1,403	€ 601

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- Definition

Disclosure Of Claims And Benefits Paid [abstract]

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No definition available.

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- Definition

Gains losses on change for account of policyholder financial assets at fair value through profit or loss.

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No definition available.

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- Definition

Increase Decrease in Provisions

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No definition available.

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