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Inventories (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Inventories          
Finished products $ 3,055   $ 3,055   $ 2,626
Work in progress 725   725   647
Consumable inventory 921   921   788
Total 4,701   4,701   $ 4,061
Reversal (provision) for net realizable value $ (12) $ 23 $ 1 $ (39)