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Financial risk management - Captial Management (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Capital management    
Net interest-bearing debt adjusted, including lease liabilities (ND1) $ 17,219 $ 0
Net interest-bearing debt adjusted (ND2) 12,880 12,246
Capital employed adjusted, including lease liabilities (CE1) 58,378 0
Capital employed adjusted (CE2) $ 54,039 $ 55,235
Net debt to capital employed adjusted, including lease liabilities (ND1/CE1) 29.50% 0.00%
Net debt to capital employed adjusted (ND)/(CE) 23.80% 22.20%