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Additional disclosure items G.4. Non-cash investing and financing activity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Additional information [abstract]      
Acquisition of property, plant and equipment $ (47) $ (27) $ 17
Asset retirement obligations 32 19 19
Acquisition of subsidiaries, joint ventures and associates, net of cash acquired 106 92 100
Share based compensation $ 17 $ 24 $ 27