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Financial Risks - Schedule of Credit Risk Concentration - Mortgage Loans (Detail) - Mortgage loans [member] - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | € 37,750 | € 36,240
Agricultural mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 69 | 69
Apartment mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 4,383 | 3,993
Industrial mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1,266 | 871
Office mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1,395 | 1,343
Retail mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1,583 | 1,466
Other commercial mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 302 | 292
Residential mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 28,752 | 28,207
Americas [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 8,956 | 8,002
Americas [member] | Agricultural mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 69 | 69
Americas [member] | Apartment mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 4,383 | 3,993
Americas [member] | Industrial mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1,266 | 871
Americas [member] | Office mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1,395 | 1,342
Americas [member] | Retail mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1,575 | 1,457
Americas [member] | Other commercial mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 258 | 258
Americas [member] | Residential mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 9 | 12
The Netherlands [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 28,793 | 28,237
The Netherlands [member] | Retail mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 8 | 9
The Netherlands [member] | Other commercial mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 43 | 35
The Netherlands [member] | Residential mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 28,742 | 28,193
Southern & Eastern Europe [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1 | 1
Southern & Eastern Europe [member] | Residential mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1 | 1
Past due and impaired [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 259 | 337
Past due and impaired [member] | Agricultural mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations |  | 15
Past due and impaired [member] | Apartment mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 94 | 92
Past due and impaired [member] | Retail mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1 | 1
Past due and impaired [member] | Other commercial mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1 | 2
Past due and impaired [member] | Residential mortgage loans [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | € 163 | € 227

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