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Derivatives - Credit Derivative Disclosure By Quality (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of internal credit grades [Line Items]    
Notional € 4,444 € 4,358
Fair value 89 57
AAA [member]    
Disclosure of internal credit grades [Line Items]    
Notional 10 16
AA [member]    
Disclosure of internal credit grades [Line Items]    
Notional 106 97
Fair value 3 1
A [member]    
Disclosure of internal credit grades [Line Items]    
Notional 915 764
Fair value 13 10
BBB [member]    
Disclosure of internal credit grades [Line Items]    
Notional 3,258 3,201
Fair value 70 45
BB [member]    
Disclosure of internal credit grades [Line Items]    
Notional 97 226
Fair value 3 5
B or lower [member]    
Disclosure of internal credit grades [Line Items]    
Notional € 58 54
Fair value   € (3)