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Financial Risks - Summary of Income Received From Investments in RMBSs, SMBSs and ABSs (Detail) - EUR (€)
€ in Millions
 12 Months Ended
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