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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
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