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Financial instruments - additional disclosures (Details 12)
$ in Millions, € in Billions, ¥ in Billions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
JPY (¥)
Disclosure of derivative financial instruments [line items]        
Transfers out of Level 3 of fair value hierarchy, assets $ (166) $ (64)    
Amount of change in OCI when pricing parameters for level 3 change more than 10% 104      
Amount of change in OCI when most significant parameters for level 3 change more than 10% 260      
Amount of change in OCI when POS for level 3 change more than 10% 324      
Fair value of other financial assets sold 206 33    
Long-term financial debt with a carrying amount $ 2,300 2,100 € 1.8  
Maximum margin percentage impact of commodity price change 10.00%      
Maximum holding in unrelated company 5.00%      
Unrealized loss was recognized in other comprehensive income and accumulated in currency translation effects in relation with this net investment hedge $ 201      
Unrealized income was recognized in other comprehensive income and accumulated in currency translation effects in relation with this net investment hedge   44    
Net investment hedge recognized in the income statement 0      
Borrowings commercial paper maximum borrowing amount $ 4,300 2,300    
Borrowings commercial paper, number of programs 3   3 3
Borrowings credit facility committed $ 6,000      
Borrowings credit facility short term   7,000    
Amount borrowed under the credit facility $ 7,000      
VAR estimate confidence interval 95.00%   95.00% 95.00%
Net loss/gain recorded on equity securities and fund investments at fair value through the consolidated income statement $ 92 $ 427    
US commercial paper programs [member]        
Disclosure of derivative financial instruments [line items]        
Borrowings commercial paper maximum borrowing amount $ 9,000      
Borrowings commercial paper, number of programs 2   2 2
JP commercial paper programs [member]        
Disclosure of derivative financial instruments [line items]        
Borrowings commercial paper maximum borrowing amount $ 1,500     ¥ 150
Borrowings commercial paper, number of programs 1   1 1
Largest financial institution [member]        
Counterparty risk [abstract]        
Percentage of entity's cash and cash equivalents held with financial institution 14.10% 12.60%    
Second largest financial institution [member]        
Counterparty risk [abstract]        
Percentage of entity's cash and cash equivalents held with financial institution 12.60% 10.40%    
Third largest financial institution [member]        
Counterparty risk [abstract]        
Percentage of entity's cash and cash equivalents held with financial institution 9.70% 8.30%