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Investments - Summary of Movement on Loan Allowance Account (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Changes In Allowance For Loan Losses [abstract]
Beginning balance	€ (138)	€ (165)
Addition charged to income statement	(76)	(35)
Reversal to income statement	5	3
Amounts written off	44	40
Net exchange differences		(1)
Other		20
Ending balance	€ (165)	€ (138)

X

- Definition

Allowance for loan losses exchange rate differences.

+ References

No definition available.

+ Details

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- Definition

Allowances for loan losses, additions charged to profit (loss).

+ References

No definition available.

+ Details

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- Definition

Allowances for loan losses beginning balance.

+ References

No definition available.

+ Details

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X

- Definition

Allowance for doubtful debts ending balance.

+ References

No definition available.

+ Details

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X

- Definition

Allowances for loan losses recoveries other changes.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Allowances for loan losses, reversal charged to profit (loss).

+ References

No definition available.

+ Details

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X

- Definition

Change in allowance for loan losses write offs.

+ References

No definition available.

+ Details

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X

- Definition

Disclosure of changes In allowance for loan losses.

+ References

No definition available.

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