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Main items related to operating activities - Inventories, Valuation Allowance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in the valuation allowance on inventories      
Balance as of the beginning of the period $ 17,132 $ 14,880  
Balance as of the end of the period 14,730 17,132 $ 14,880
Valuation allowance/Cumulative impairments      
Changes in the valuation allowance on inventories      
Balance as of the beginning of the period (1,174) (1,343) (1,007)
Increase (net) (85) 205 (359)
Currency translation adjustment and other variations (26) (36) 23
Balance as of the end of the period $ (1,285) $ (1,174) $ (1,343)