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Main items related to operating activities - Cash flow from operating activities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Detail of interest, taxes and dividends      
Interests paid $ (2,145) $ (2,181) $ (1,818)
Interests received 197 210 164
Income tax paid (2,858) (5,293) (5,024)
Dividends received 1,444 1,988 2,456
Detail of changes in working capital      
Inventories 2,274 (2,071) 1,430
Accounts receivable 4,818 (933) (1,461)
Other current assets 3,374 (2,001) (364)
Accounts payable (5,355) 1,998 (822)
Other creditors and accrued liabilities (3,242) 1,289 1,986
NET AMOUNT, DECREASE (INCREASE) 1,869 (1,718) 769
Detail of changes in provisions and deferred taxes      
Accruals 350 403 (432)
Deferred taxes (2,132) (461) (455)
TOTAL $ (1,782) $ (58) $ (887)