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Financial Risks - Summary of Financial Assets that are Either Past Due or Impaired (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Financial assets impaired [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | € 1,039 | € 1,247
Financial assets impaired [member] | Share [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 30 | 33
Financial assets impaired [member] | Debt securities [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 945 | 1,085
Financial assets impaired [member] | Mortgage loans - held at amortized cost [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 58 | 122
Financial assets impaired [member] | Other loans - held at amortized cost [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 3 | 3
Financial assets impaired [member] | Other financial asset [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 4 | 5
Past due but not impaired assets [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 370 | 544
Past due but not impaired assets [member] | Debt securities [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 101 | 277
Past due but not impaired assets [member] | Mortgage loans - held at amortized cost [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 201 | 215
Past due but not impaired assets [member] | Other loans - held at amortized cost [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 43 | 45
Past due but not impaired assets [member] | Other financial asset [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 22 |
Past due but not impaired assets [member] | Accrued interest [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 2 | 6
Past due but not impaired assets [member] | 0 - 6 months [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 326 | 344
Past due but not impaired assets [member] | 0 - 6 months [member] | Debt securities [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 70 | 108
Past due but not impaired assets [member] | 0 - 6 months [member] | Mortgage loans - held at amortized cost [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 198 | 192
Past due but not impaired assets [member] | 0 - 6 months [member] | Other loans - held at amortized cost [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 35 | 41
Past due but not impaired assets [member] | 0 - 6 months [member] | Other financial asset [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 22 |
Past due but not impaired assets [member] | 0 - 6 months [member] | Accrued interest [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 1 | 3
Past due but not impaired assets [member] | 6 - 12 months [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 28 | 148
Past due but not impaired assets [member] | 6 - 12 months [member] | Debt securities [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 21 | 121
Past due but not impaired assets [member] | 6 - 12 months [member] | Mortgage loans - held at amortized cost [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 3 | 22
Past due but not impaired assets [member] | 6 - 12 months [member] | Other loans - held at amortized cost [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 4 | 2
Past due but not impaired assets [member] | 6 - 12 months [member] | Accrued interest [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets |  | 3
Past due but not impaired assets [member] | Not later than 1 year [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 16 | 52
Past due but not impaired assets [member] | Not later than 1 year [member] | Debt securities [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 10 | 48
Past due but not impaired assets [member] | Not later than 1 year [member] | Mortgage loans - held at amortized cost [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets |  | 2
Past due but not impaired assets [member] | Not later than 1 year [member] | Other loans - held at amortized cost [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | 4 | € 2
Past due but not impaired assets [member] | Not later than 1 year [member] | Accrued interest [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Impaired financial assets | € 1 |

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- Definition The fair value of collateral available and other credit enhancements obtained for financial assets that are individually determined to be impaired. [Refer: Financial assets; Impairment loss] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph IG29 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_IG29_c&doctype=Implementation%20Guidance&book=b -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 37 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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