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Financial Risks - Summary of General Account Equity Real Estate and Other Non-fixed-income Portfolio (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | € 9,205 | € 8,412
Americas [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 4,272 | 3,501
The Netherlands [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 3,750 | 3,617
United Kingdom [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 891 | 1,050
Southern & Eastern Europe [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 96 | 99
Asia [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 11 | 7
Equity Funds 1 [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 259 | 401
Equity Funds 1 [member] | Americas [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 161 | 141
Equity Funds 1 [member] | The Netherlands [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 35 | 196
Equity Funds 1 [member] | Southern & Eastern Europe [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 63 | 63
Common shares [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 258 | 287
Common shares [member] | Americas [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 130 | 203
Common shares [member] | United Kingdom [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 17 | 3
Common shares [member] | Southern & Eastern Europe [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 4 | 6
Common shares [member] | Asia [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 11 | 7
Preferred Shares [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 279 | 233
Preferred Shares [member] | Americas [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 208 | 187
Investments in real estate [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 2,901 | 2,700
Investments in real estate [member] | Americas [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 653 | 530
Investments in real estate [member] | The Netherlands [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 2,229 | 2,150
Investments in real estate [member] | Southern & Eastern Europe [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 19 | 21
Hedge funds [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 702 | 681
Hedge funds [member] | Americas [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 699 | 678
Hedge funds [member] | The Netherlands [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets |  | 1
Other Alternative Investments [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 1,787 | 1,666
Other Alternative Investments [member] | Americas [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 1,366 | 1,206
Other Alternative Investments [member] | The Netherlands [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 405 | 438
Other financial asset [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 3,020 | 2,443
Other financial asset [member] | Americas [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 1,055 | 555
Other financial asset [member] | The Netherlands [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 1,080 | 832
Other financial asset [member] | United Kingdom [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 874 | 1,046
Other financial asset [member] | Southern & Eastern Europe [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 10 | 9
Asset management [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 6 | 5
Asset management [member] | Common shares [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 2 | 1
Asset management [member] | Hedge funds [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 2 | 2
Asset management [member] | Other financial asset [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 1 | 1
Holding and other activities [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 181 | 134
Holding and other activities [member] | Common shares [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 94 | 66
Holding and other activities [member] | Preferred Shares [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | 70 | 46
Holding and other activities [member] | Other Alternative Investments [member] |  |
General account equity, real estate and other non-fixed-income portfolio [line items] |  |
Maximum exposure to credit risk of financial assets | € 17 | € 22

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