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Segmentation of key figures (Details 5) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Net sales to third parties from continuing operations $ 48,659 $ 47,445 $ 44,751
Net sales (in % of total net sales) 100.00% 100.00% 100.00%
Total of selected non-current assets $ 90,379 $ 77,701  
Selected non-current assets (in % of total selected non-current assets) 100.00% 100.00%  
Europe [member]      
Disclosure of operating segments [line items]      
Net sales to third parties from continuing operations $ 18,715 $ 17,933 $ 17,259
Net sales (in % of total net sales) 38.00% 38.00% 39.00%
Total of selected non-current assets $ 47,798 $ 46,103  
Selected non-current assets (in % of total selected non-current assets) 53.00% 59.00%  
Americas [member]      
Disclosure of operating segments [line items]      
Net sales to third parties from continuing operations $ 19,725 $ 19,713 $ 18,032
Net sales (in % of total net sales) 41.00% 41.00% 39.00%
Total of selected non-current assets $ 40,391 $ 29,389  
Selected non-current assets (in % of total selected non-current assets) 45.00% 38.00%  
Asia/Africa/Australasia [member]      
Disclosure of operating segments [line items]      
Net sales to third parties from continuing operations $ 10,219 $ 9,799 $ 9,460
Net sales (in % of total net sales) 21.00% 21.00% 22.00%
Total of selected non-current assets $ 2,190 $ 2,209  
Selected non-current assets (in % of total selected non-current assets) 2.00% 3.00%