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Note 22 - Assets and Liabilities under reinsurance and insurance contracts - Liabilities Under Reassurance And Assurance Contracts (Details) - EUR (€)
Jun. 30, 2020
Dec. 31, 2019
Technical reserves by type of insurance product    
LIABILITIES UNDER INSURANCE CONTRACTS € 9,462,000,000 € 10,606,000,000
Mathematical reserves [Member]    
Technical reserves by type of insurance product    
LIABILITIES UNDER INSURANCE CONTRACTS [1] 8,310,000,000 9,247,000,000
Provision for unpaid claims reported [Member]    
Technical reserves by type of insurance product    
LIABILITIES UNDER INSURANCE CONTRACTS 652,000,000 641,000,000
Provisions for unexpired risks and other provisions [Member]    
Technical reserves by type of insurance product    
LIABILITIES UNDER INSURANCE CONTRACTS 500,000,000 718,000,000
Total    
Technical reserves by type of insurance product    
LIABILITIES UNDER INSURANCE CONTRACTS € 9,462,000,000 € 10,606,000,000
[1]

(*) The variation corresponds mainly to the decrease in Mexico.