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Note 22 - Liabilities under reinsurance and insurance contracts - Technical Reserves by type of insurance product (Details) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Technical reserves by type of insurance product    
LIABILITIES UNDER INSURANCE CONTRACTS € 9,500 € 9,223
INSURANCE OR REINSURANCE ASSETS 414 421
Mathematical reserves [Member]    
Technical reserves by type of insurance product    
LIABILITIES UNDER INSURANCE CONTRACTS 8,134 7,961
Provision for unpaid claims reported [Member]    
Technical reserves by type of insurance product    
LIABILITIES UNDER INSURANCE CONTRACTS 645 631
Provisions for unexpired risks and other provisions [Member]    
Technical reserves by type of insurance product    
LIABILITIES UNDER INSURANCE CONTRACTS 721 631
Total [Member]    
Technical reserves by type of insurance product    
LIABILITIES UNDER INSURANCE CONTRACTS € 9,500 € 9,223