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Financial risk and capital management - Captial Management (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Capital management    
Net interest-bearing debt adjusted, including lease liabilities (ND1) $ 20,121 $ 17,219
Net interest-bearing debt adjusted (ND2) 15,716 12,880
Capital employed adjusted, including lease liabilities (CE1) 54,012 58,378
Capital employed adjusted (CE2) $ 49,608 $ 54,039
Net debt to capital employed adjusted, including lease liabilities (ND1/CE1) 37.30% 29.50%
Net debt to capital employed adjusted (ND)/(CE) 31.70% 23.80%