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Derivative financial instruments - Hedge in foreign operations (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Financial instruments classification          
Loss recognized in the other comprehensive income $ 1,111 $ 3,899 $ 1,026    
Currency risk          
Financial instruments classification          
Debts designated as instrument hedge       € 750 $ 2,457
Hedge in foreign operation, net of tax          
Financial instruments classification          
Loss recognized in the other comprehensive income $ (74) $ (543) $ (95)