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Financial Risks - Summary of Breakdown of RMBS Available-for-Sale (AFS) Portfolio (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of financial assets [line items] |  |
Total fair value | € 148,570 | € 139,834
Available for sale - residential mortgage-backed securities by quality [member] |  |
Disclosure of financial assets [line items] |  |
Total fair value | 2,222 | 2,102
Available for sale - residential mortgage-backed securities by quality [member] | GSE guaranteed [member] |  |
Disclosure of financial assets [line items] |  |
Total fair value | 782 | 599
Available for sale - residential mortgage-backed securities by quality [member] | Prime jumbo [member] |  |
Disclosure of financial assets [line items] |  |
Total fair value | 62 | 124
Available for sale - residential mortgage-backed securities by quality [member] | Alt-A [member] |  |
Disclosure of financial assets [line items] |  |
Total fair value | 462 | 397
Available for sale - residential mortgage-backed securities by quality [member] | Negative amortization floaters [member] |  |
Disclosure of financial assets [line items] |  |
Total fair value | 468 | 533
Available for sale - residential mortgage-backed securities by quality [member] | Other housing [member] |  |
Disclosure of financial assets [line items] |  |
Total fair value | 449 | 450
Available for sale - residential mortgage-backed securities by quality [member] | Insured residential mortgage backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Total fair value | 100 | 113
Available for sale - residential mortgage-backed securities by quality [member] | AAA [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 790 | 450
Available for sale - residential mortgage-backed securities by quality [member] | AAA [member] | GSE guaranteed [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 735 | 450
Available for sale - residential mortgage-backed securities by quality [member] | AAA [member] | Prime jumbo [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 6 |
Available for sale - residential mortgage-backed securities by quality [member] | AAA [member] | Alt-A [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 48 |
Available for sale - residential mortgage-backed securities by quality [member] | AAA [member] | Other housing [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 2 |
Available for sale - residential mortgage-backed securities by quality [member] | AA [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 129 | 238
Available for sale - residential mortgage-backed securities by quality [member] | AA [member] | GSE guaranteed [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 43 | 149
Available for sale - residential mortgage-backed securities by quality [member] | AA [member] | Prime jumbo [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 16 | 16
Available for sale - residential mortgage-backed securities by quality [member] | AA [member] | Alt-A [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 59 | 59
Available for sale - residential mortgage-backed securities by quality [member] | AA [member] | Negative amortization floaters [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 2 | 1
Available for sale - residential mortgage-backed securities by quality [member] | AA [member] | Other housing [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 9 | 13
Available for sale - residential mortgage-backed securities by quality [member] | A [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 18 | 22
Available for sale - residential mortgage-backed securities by quality [member] | A [member] | Prime jumbo [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 1 | 1
Available for sale - residential mortgage-backed securities by quality [member] | A [member] | Alt-A [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 15 | 17
Available for sale - residential mortgage-backed securities by quality [member] | A [member] | Other housing [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 2 | 4
Available for sale - residential mortgage-backed securities by quality [member] | A [member] | Insured residential mortgage backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 16 | 20
Available for sale - residential mortgage-backed securities by quality [member] | BBB [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 28 | 36
Available for sale - residential mortgage-backed securities by quality [member] | BBB [member] | Prime jumbo [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 2 | 5
Available for sale - residential mortgage-backed securities by quality [member] | BBB [member] | Alt-A [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 10 | 5
Available for sale - residential mortgage-backed securities by quality [member] | BBB [member] | Negative amortization floaters [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 9 | 11
Available for sale - residential mortgage-backed securities by quality [member] | BBB [member] | Other housing [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 7 | 16
Available for sale - residential mortgage-backed securities by quality [member] | BBB [member] | Insured residential mortgage backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 4 | 5
Available for sale - residential mortgage-backed securities by quality [member] | BB [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 973 | 1,089
Available for sale - residential mortgage-backed securities by quality [member] | BB [member] | Prime jumbo [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 32 | 98
Available for sale - residential mortgage-backed securities by quality [member] | BB [member] | Alt-A [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 242 | 221
Available for sale - residential mortgage-backed securities by quality [member] | BB [member] | Negative amortization floaters [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 382 | 438
Available for sale - residential mortgage-backed securities by quality [member] | BB [member] | Other housing [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 317 | 333
Available for sale - residential mortgage-backed securities by quality [member] | BB [member] | Insured residential mortgage backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 88 | 99
Available for sale - residential mortgage-backed securities by quality [member] | Cost [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 1,938 | 1,836
Available for sale - residential mortgage-backed securities by quality [member] | Cost [member] | GSE guaranteed [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 778 | 599
Available for sale - residential mortgage-backed securities by quality [member] | Cost [member] | Prime jumbo [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 56 | 120
Available for sale - residential mortgage-backed securities by quality [member] | Cost [member] | Alt-A [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 373 | 301
Available for sale - residential mortgage-backed securities by quality [member] | Cost [member] | Negative amortization floaters [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 394 | 450
Available for sale - residential mortgage-backed securities by quality [member] | Cost [member] | Other housing [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | 337 | 366
Available for sale - residential mortgage-backed securities by quality [member] | Cost [member] | Insured residential mortgage backed securities [member] |  |
Disclosure of financial assets [line items] |  |
Total amortized cost | € 109 | € 124

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