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Note 15 - Investments in subsidiaries, joint ventures and associates - Associates Entities and joint ventures - Breakdown by entities (Details) - EUR (€)
Jun. 30, 2020
Dec. 31, 2019
Investments In Subsidiaries Joint Ventures And Associates Line Items    
Joint ventures € 150,000,000 € 154,000,000
Associates 1,216,000,000 1,334,000,000
INVESTMENTS IN SUBSIDIARIES JOINT VENTURES AND ASSOCIATES € 1,366,000,000 € 1,488,000,000