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Inventories (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Inventory      
Inventory $ 7,131 $ 5,982  
Amount of inventory recognized as expense (8,500) (8,500) $ (8,300)
Inventory provisions (702) (752) (603)
Reversed inventory Provisions 255 218 $ 216
Raw material, consumables      
Inventory      
Inventory 967 751  
Work in progress      
Inventory      
Inventory 3,324 3,024  
Finished products      
Inventory      
Inventory $ 2,840 $ 2,207