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ACQUISITIONS - X-Elio (Details) - 1 months ended Dec. 31, 2019 - X-Elio
€ in Millions, $ in Millions
EUR (€)
USD ($)
Disclosure of detailed information about business combination [line items]    
Proportion of ownership interest in joint venture 50.00%  
Economic interest in joint venture 12.50%  
Investments in joint ventures € 124 $ 138