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Financial Risks - Schedule of Credit Risk Concentration - Debt Securities and Money Market Investments (Detail) - Debt securities and money market investments [member] - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of credit risk exposure [line items]    
Credit risk concentrations € 92,180 € 87,560
Residential mortgage- backed securities (RMBSs) [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 2,729 2,585
Commercial mortgage- backed securities (CMBSs) [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 4,154 4,013
Asset backed securities [member] | Collateralized debt obligations 1 [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 1,642 2,447
Asset backed securities [member] | Credit risk [member] | Other securities [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 2,258 2,552
Financial - Banking [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 10,554 9,059
Financial - other [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 10,096 9,924
Industrial [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 28,835 25,457
Utility [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 4,411 4,169
Government bonds [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 27,500 27,356
Americas [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 59,882 57,609
Americas [member] | Residential mortgage- backed securities (RMBSs) [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 2,289 2,138
Americas [member] | Commercial mortgage- backed securities (CMBSs) [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 3,428 3,314
Americas [member] | Asset backed securities [member] | Collateralized debt obligations 1 [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 519 717
Americas [member] | Asset backed securities [member] | Credit risk [member] | Other securities [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 1,724 1,915
Americas [member] | Financial - Banking [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 6,561 6,423
Americas [member] | Financial - other [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 8,885 8,863
Americas [member] | Industrial [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 23,158 21,060
Americas [member] | Utility [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 3,760 3,572
Americas [member] | Government bonds [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 9,558 9,607
The Netherlands [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 22,773 21,586
The Netherlands [member] | Residential mortgage- backed securities (RMBSs) [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 311 395
The Netherlands [member] | Commercial mortgage- backed securities (CMBSs) [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 13 35
The Netherlands [member] | Asset backed securities [member] | Collateralized debt obligations 1 [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 1,050 1,669
The Netherlands [member] | Asset backed securities [member] | Credit risk [member] | Other securities [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 73 247
The Netherlands [member] | Financial - Banking [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 2,684 1,473
The Netherlands [member] | Financial - other [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 191 188
The Netherlands [member] | Industrial [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 2,243 1,515
The Netherlands [member] | Utility [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 136 115
The Netherlands [member] | Government bonds [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 16,072 15,948
United Kingdom [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 1,143 1,064
United Kingdom [member] | Commercial mortgage- backed securities (CMBSs) [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 128 127
United Kingdom [member] | Asset backed securities [member] | Credit risk [member] | Other securities [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 72 61
United Kingdom [member] | Financial - Banking [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 154 132
United Kingdom [member] | Financial - other [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 38 33
United Kingdom [member] | Industrial [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 234 213
United Kingdom [member] | Utility [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 67 60
United Kingdom [member] | Government bonds [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 449 438
Southern & Eastern Europe [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 1,497 1,419
Southern & Eastern Europe [member] | Asset backed securities [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations   6
Southern & Eastern Europe [member] | Asset backed securities [member] | Credit risk [member] | Other securities [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 6  
Southern & Eastern Europe [member] | Financial - Banking [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 224 210
Southern & Eastern Europe [member] | Financial - other [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 71 116
Southern & Eastern Europe [member] | Industrial [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 176 148
Southern & Eastern Europe [member] | Utility [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 45 51
Southern & Eastern Europe [member] | Government bonds [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 975 889
Asia [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 6,609 5,696
Asia [member] | Residential mortgage- backed securities (RMBSs) [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 128 52
Asia [member] | Commercial mortgage- backed securities (CMBSs) [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 584 537
Asia [member] | Asset backed securities [member] | Collateralized debt obligations 1 [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 73 61
Asia [member] | Asset backed securities [member] | Credit risk [member] | Other securities [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 384 323
Asia [member] | Financial - Banking [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 928 815
Asia [member] | Financial - other [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 742 595
Asia [member] | Industrial [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 2,966 2,486
Asia [member] | Utility [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 402 370
Asia [member] | Government bonds [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 401 457
Asset management [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 260 176
Asset management [member] | Commercial mortgage- backed securities (CMBSs) [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 1  
Asset management [member] | Financial - Banking [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 3 6
Asset management [member] | Financial - other [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 154 121
Asset management [member] | Industrial [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 57 33
Asset management [member] | Utility [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 1  
Asset management [member] | Government bonds [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 44 17
Past due and impaired [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 1,046 1,362
Past due and impaired [member] | Residential mortgage- backed securities (RMBSs) [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 909 918
Past due and impaired [member] | Commercial mortgage- backed securities (CMBSs) [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 8 14
Past due and impaired [member] | Asset backed securities [member] | Collateralized debt obligations 1 [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 4 3
Past due and impaired [member] | Asset backed securities [member] | Credit risk [member] | Other securities [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 1 40
Past due and impaired [member] | Financial - Banking [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 4 29
Past due and impaired [member] | Financial - other [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 4 19
Past due and impaired [member] | Industrial [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 61 187
Past due and impaired [member] | Utility [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations 52 144
Past due and impaired [member] | Government bonds [member] | Credit risk [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations € 2 € 8