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Financial Risks - Schedule of Maximum Exposure to Credit Risk (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of credit risk exposure [line items] |  |
Master netting agreements collateral | € 122 | € 120
Credit risk [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 172,346 | 161,607
Cash collateral | 5,365 | 5,207
Securities collateral | 4,294 | 4,752
Letters of credit /guarantees collateral | 468 | 439
Real estate property collateral | 61,159 | 57,009
Master netting agreements collateral | 8,186 | 4,606
Other collateral | 2,008 | 1,960
Total collateral | 81,481 | 73,972
Surplus collateral | 27,884 | 25,081
Net exposure | 118,749 | 112,715
Credit risk [member] | Debt securities - carried at fair value [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 86,853 | 81,253
Letters of credit /guarantees collateral | 267 | 169
Total collateral | 267 | 169
Net exposure | 86,586 | 81,084
Credit risk [member] | Money market and other short-term investments - carried at fair value [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 5,327 | 6,307
Securities collateral | 363 | 484
Total collateral | 363 | 484
Surplus collateral | 23 | 29
Net exposure | 4,987 | 5,852
Credit risk [member] | Mortgage loans - carried at amortized cost [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 37,750 | 36,240
Cash collateral | 2,648 | 2,535
Letters of credit /guarantees collateral | 65 | 136
Real estate property collateral | 61,159 | 57,009
Total collateral | 63,872 | 59,680
Surplus collateral | 26,249 | 23,589
Net exposure | 127 | 149
Credit risk [member] | Private loans - held at amortized cost [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 4,487 | 4,103
Cash collateral | 51 | 45
Total collateral | 51 | 45
Net exposure | 4,436 | 4,058
Credit risk [member] | Other loans - held at amortized cost [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 2,353 | 2,310
Other collateral | 2,008 | 1,960
Total collateral | 2,008 | 1,960
Surplus collateral | 1,329 | 1,238
Net exposure | 1,674 | 1,589
Credit risk [member] | Other financial assets - carried at fair value [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 4,083 | 3,551
Net exposure | 4,083 | 3,551
Credit risk [member] | Derivatives [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 10,658 | 7,337
Cash collateral | 2,666 | 2,627
Securities collateral | 47 | 233
Letters of credit /guarantees collateral | 31 | 31
Master netting agreements collateral | 8,186 | 4,606
Total collateral | 10,930 | 7,496
Surplus collateral | 283 | 225
Net exposure | 10 | 66
Credit risk [member] | Reinsurance assets [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 20,835 | 20,505
Securities collateral | 3,884 | 4,035
Letters of credit /guarantees collateral | 105 | 104
Total collateral | 3,989 | 4,139
Net exposure | € 16,845 | € 16,366

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