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Financial Risks - Schedule of Credit Risk Concentration - Government Bonds (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
United States government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | € 9,210 | € 9,253
Netherlands government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 6,316 | 6,040
United Kingdom government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 380 | 374
Austria government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1,230 | 1,106
Belgium government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1,123 | 1,027
Finland government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 135 | 949
France government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1,551 | 1,329
Germany government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 4,649 | 4,397
Hungary government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 348 | 413
Luxembourg government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 807 | 787
Spain government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 368 | 298
Rest of Europe government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 646 | 623
Rest of world government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 737 | 730
Supranational government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1 | 30
Government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 27,500 | 27,356
Americas [member] | United States government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 8,893 | 8,891
Americas [member] | Hungary government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 2 | 3
Americas [member] | Rest of Europe government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 85 | 103
Americas [member] | Rest of world government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 576 | 580
Americas [member] | Supranational government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1 | 30
Americas [member] | Government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 9,558 | 9,607
The Netherlands [member] | United States government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1 |
The Netherlands [member] | Netherlands government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 6,316 | 6,040
The Netherlands [member] | Austria government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1,227 | 1,102
The Netherlands [member] | Belgium government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1,097 | 1,000
The Netherlands [member] | Finland government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 135 | 949
The Netherlands [member] | France government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 1,512 | 1,292
The Netherlands [member] | Germany government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 4,649 | 4,397
The Netherlands [member] | Luxembourg government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 807 | 786
The Netherlands [member] | Spain government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 95 | 89
The Netherlands [member] | Rest of Europe government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 216 | 264
The Netherlands [member] | Rest of world government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 17 | 30
The Netherlands [member] | Government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 16,072 | 15,948
United Kingdom [member] | United Kingdom government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 362 | 356
United Kingdom [member] | Belgium government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 21 | 21
United Kingdom [member] | France government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 35 | 33
United Kingdom [member] | Rest of world government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 32 | 28
United Kingdom [member] | Government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 449 | 438
Southern & Eastern Europe [member] | United States government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 4 |
Southern & Eastern Europe [member] | United Kingdom government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations |  | 1
Southern & Eastern Europe [member] | Austria government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 4 | 4
Southern & Eastern Europe [member] | Belgium government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 5 | 6
Southern & Eastern Europe [member] | France government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 3 | 5
Southern & Eastern Europe [member] | Hungary government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 345 | 410
Southern & Eastern Europe [member] | Luxembourg government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations |  | 1
Southern & Eastern Europe [member] | Spain government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 273 | 209
Southern & Eastern Europe [member] | Rest of Europe government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 336 | 247
Southern & Eastern Europe [member] | Rest of world government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 5 | 5
Southern & Eastern Europe [member] | Government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 975 | 889
Asia [member] | United States government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 309 | 362
Asia [member] | Rest of Europe government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 6 | 9
Asia [member] | Rest of world government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 85 | 86
Asia [member] | Government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 401 | 457
Asset management [member] | United States government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 2 |
Asset management [member] | United Kingdom government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 18 | 17
Asset management [member] | Rest of Europe government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 3 |
Asset management [member] | Rest of world government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 22 |
Asset management [member] | Supranational government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | 0 |
Asset management [member] | Government bonds [member] |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk concentrations | € 44 | € 17

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