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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

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