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Details to the consolidated cash flow statements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]      
Change in provisions and other non-current liabilities $ 1,411 $ 1,871 $ 895
Gains on disposal and other adjustments on property, plant and equipment; intangible assets;financial assets; and other non-current assets, net (478) (1,234) (902)
Equity-settled compensation expense 738 758 673
Income from associated companies (673) (659) (6,438)
Taxes 1,807 1,793 1,295
Net financial expense 947 805 746
Total 9,881 9,122 1,486
Property, plant and equipment      
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]      
Adjustments for depreciation and amortisation expense and impairment loss (reversal of impairment loss) recognised in profit or loss 1,758 1,547 1,783
Right-of-use assets [member]      
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]      
Adjustments for depreciation and amortisation expense and impairment loss (reversal of impairment loss) recognised in profit or loss 330 305  
Intangible assets      
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]      
Adjustments for depreciation and amortisation expense and impairment loss (reversal of impairment loss) recognised in profit or loss 4,376 3,974 3,428
Financial assets impaired [member]      
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]      
Adjustments for depreciation and amortisation expense and impairment loss (reversal of impairment loss) recognised in profit or loss $ (335) $ (38) $ 6