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Financial Risks - Summary of Length of Time an Available-for-Sale Security (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss € (121) € (272)
Investment grade [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss (89) (992)
Investment grade [member] | 0 - 6 months [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss (35) (227)
Investment grade [member] | 6 - 12 months [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss (2) (504)
Investment grade [member] | > 12 months [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss (52) (261)
Below investment grade [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss (121) (272)
Below investment grade [member] | 0 - 6 months [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss (7) (58)
Below investment grade [member] | 6 - 12 months [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss (4) (96)
Below investment grade [member] | > 12 months [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss (110) (119)
Carrying value [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss 608 2,069
Carrying value [member] | Investment grade [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss 3,799 22,012
Carrying value [member] | Investment grade [member] | 0 - 6 months [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss 2,178 8,354
Carrying value [member] | Investment grade [member] | 6 - 12 months [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss 128 9,976
Carrying value [member] | Investment grade [member] | > 12 months [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss 1,493 3,681
Carrying value [member] | Below investment grade [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss 608 2,069
Carrying value [member] | Below investment grade [member] | 0 - 6 months [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss 132 977
Carrying value [member] | Below investment grade [member] | 6 - 12 months [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss 45 609
Carrying value [member] | Below investment grade [member] | > 12 months [member]    
Disclosure of available for sale securities [line items]    
Debt securities investment grade unrealized loss € 432 € 483