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Interest expense and other financial income and expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Interest expense [abstract]      
Interest expense $ (708) $ (714) $ (877)
Interest expense on lease liabilities (67) (66)  
Income/expense arising from discounting long-term liabilities (94) (70) (55)
Total interest expense from continuing operations $ (869) $ (850) $ (932)