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Financial Risks - Aging and Severity Unrealised Losses Debt Securities (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of available for sale securities [line items]    
Carrying value € (121) € (272)
0 - 6 months [member]    
Disclosure of available for sale securities [line items]    
Carrying value (7) (58)
0 - 6 months [member] | CV 70-100% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value (6) (53)
0 - 6 months [member] | CV 40-70% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value (1) (5)
6 - 12 months [member]    
Disclosure of available for sale securities [line items]    
Carrying value (4) (96)
6 - 12 months [member] | CV 70-100% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value (3) (76)
6 - 12 months [member] | CV 40-70% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value (1) (18)
6 - 12 months [member] | CV below 40% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value   (1)
12-24 months [member]    
Disclosure of available for sale securities [line items]    
Carrying value (52) (28)
12-24 months [member] | CV 70-100% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value (21) (21)
12-24 months [member] | CV 40-70% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value (22) (5)
12-24 months [member] | CV below 40% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value (9) (2)
> 24 months [member]    
Disclosure of available for sale securities [line items]    
Carrying value (58) (90)
> 24 months [member] | CV 70-100% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value (24) (34)
> 24 months [member] | CV 40-70% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value (9) (43)
> 24 months [member] | CV below 40% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value (25) (13)
Carrying value [member]    
Disclosure of available for sale securities [line items]    
Carrying value 608 2,069
Carrying value [member] | 0 - 6 months [member]    
Disclosure of available for sale securities [line items]    
Carrying value 132 977
Carrying value [member] | 0 - 6 months [member] | CV 70-100% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value 131 970
Carrying value [member] | 0 - 6 months [member] | CV 40-70% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value 1 7
Carrying value [member] | 6 - 12 months [member]    
Disclosure of available for sale securities [line items]    
Carrying value 45 609
Carrying value [member] | 6 - 12 months [member] | CV 70-100% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value 43 577
Carrying value [member] | 6 - 12 months [member] | CV 40-70% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value 1 31
Carrying value [member] | 12-24 months [member]    
Disclosure of available for sale securities [line items]    
Carrying value 213 151
Carrying value [member] | 12-24 months [member] | CV 70-100% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value 175 143
Carrying value [member] | 12-24 months [member] | CV 40-70% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value 33 8
Carrying value [member] | 12-24 months [member] | CV below 40% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value 4 1
Carrying value [member] | > 24 months [member]    
Disclosure of available for sale securities [line items]    
Carrying value 219 331
Carrying value [member] | > 24 months [member] | CV 70-100% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value 192 265
Carrying value [member] | > 24 months [member] | CV 40-70% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value 13 58
Carrying value [member] | > 24 months [member] | CV below 40% of amortized cost [member]    
Disclosure of available for sale securities [line items]    
Carrying value € 14 € 8