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Financial risk and capital management - Captial Management (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Capital management    
Net interest-bearing debt adjusted, including lease liabilities (ND1) $ 3,236 $ 20,121
Net interest-bearing debt adjusted (ND2) (326) 15,716
Capital employed adjusted, including lease liabilities (CE1) 42,259 54,012
Capital employed adjusted (CE2) $ 38,697 $ 49,608
Net debt to capital employed adjusted, including lease liabilities (ND1/CE1) 7.70% 37.30%
Net debt to capital employed adjusted (ND)/(CE) (0.80%) 31.70%