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Main items related to operating activities - Valuation allowances and overdue receivables (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Main items related to operating activities      
Overdue receivables $ 4,197 $ 3,760 $ 3,767
Due in less than 90 days      
Main items related to operating activities      
Overdue receivables 2,140 2,089 1,993
Due between 90 days and 6 months      
Main items related to operating activities      
Overdue receivables 239 357 273
Due between 6 and 12 months      
Main items related to operating activities      
Overdue receivables 553 402 450
Due after 12 months      
Main items related to operating activities      
Overdue receivables 1,265 912 1,051
Accounts receivable      
Changes in the valuation allowance on "Accounts receivable" and "Other current assets"      
Valuation allowance as of the beginning of the period (674) (624) (576)
Increase (net) (107) (89) (62)
Currency translation adjustments and other variations (50) 39 14
Valuation allowance as of the end of the period (831) (674) (624)
Other current assets      
Changes in the valuation allowance on "Accounts receivable" and "Other current assets"      
Valuation allowance as of the beginning of the period (335) (573) (461)
Increase (net) 37 (46) (148)
Currency translation adjustments and other variations 23 284 36
Valuation allowance as of the end of the period $ (275) $ (335) $ (573)