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Note 23 - Assets and Liabilities under reinsurance and insurance contracts. Mathematical Reserves (Details) - EUR (€) € in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Matematical Reserves Line Items |  |  |
INSURANCE OR REINSURANCE ASSETS | € 366 | € 421 | € 447
Spain | Group Insurance [Member] |  |  |
Matematical Reserves Line Items |  |  |
Mortality Table | PERMF 2000 |  |
Average Technical Interest Type | Depending on the related portfolio |  |
Spain | Individual Insurance [Member] |  |  |
Matematical Reserves Line Items |  |  |
Mortality Table | GRMF 80-2 GKM 80 / GKMF 95 PERMF 2000 PASEM |  |
Average Technical Interest Type | 0.26%-3.27% |  |
Mexico [Member] | Group Insurance [Member] |  |  |
Matematical Reserves Line Items |  |  |
Mortality Table | Tables of the Comisión Nacional de Seguros y Fianzas 2000-grupo |  |
Average Technical Interest Type | 5.50% |  |
Mexico [Member] | Individual Insurance [Member] |  |  |
Matematical Reserves Line Items |  |  |
Mortality Table | Tables of the Comisión Nacional de Seguros y Fianzas 2000-individual |  |
Average Technical Interest Type | 2.50% |  |

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