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Derivatives - Credit Derivative Disclosure By Quality (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of internal credit grades [Line Items] |  |
Notional | € 4,444 | € 4,358
Fair value | 89 | 57
AAA [member] |  |
Disclosure of internal credit grades [Line Items] |  |
Notional | 10 | 16
AA [member] |  |
Disclosure of internal credit grades [Line Items] |  |
Notional | 106 | 97
Fair value | 3 | 1
A [member] |  |
Disclosure of internal credit grades [Line Items] |  |
Notional | 915 | 764
Fair value | 13 | 10
BBB [member] |  |
Disclosure of internal credit grades [Line Items] |  |
Notional | 3,258 | 3,201
Fair value | 70 | 45
BB [member] |  |
Disclosure of internal credit grades [Line Items] |  |
Notional | 97 | 226
Fair value | 3 | 5
B or lower [member] |  |
Disclosure of internal credit grades [Line Items] |  |
Notional | € 58 | 54
Fair value |  | € (3)

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- Definition The fair value of a credit derivative. [Refer: At fair value [member]; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24G -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24G_a&doctype=Standard -URIDate 2019-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The nominal amount of a credit derivative. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24G -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24G_a&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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