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Financial Risks - Summary of Income Received From Investments in RMBSs, SMBSs and ABSs (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Gains and losses on total value of investments [line items] |  |
Interest income | € 412 | € 417
Total gains and losses on sale of assets | 358 | (28)
Total | 769 | 389
Investments | 0 | 11,596
Residential mortgage- backed securities [member] |  |
Gains and losses on total value of investments [line items] |  |
Interest income | 140 | 140
Total gains and losses on sale of assets | 97 | (3)
Total | 237 | 137
Investments | 0 | 2,585
Commercial mortgage- backed securities (CMBSs) [member] |  |
Gains and losses on total value of investments [line items] |  |
Interest income | 138 | 139
Total gains and losses on sale of assets | 182 | (41)
Total | 320 | 98
Investments | 0 | 4,013
Asset backed securities [member] |  |
Gains and losses on total value of investments [line items] |  |
Interest income | 47 | 54
Total gains and losses on sale of assets | (1) |
Total | 45 | 54
Investments | 0 | 2,447
ABSs - other [member] |  |
Gains and losses on total value of investments [line items] |  |
Interest income | 87 | 84
Total gains and losses on sale of assets | 81 | 15
Total | 168 | 99
Investments | € 0 | € 2,552

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