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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
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