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Financial instruments - additional disclosures (Details 2) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Financial liabilities at amortised cost, class [member] | Financial liabilities at amortised cost, category [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities $ 43,022 $ 32,623
Financial liabilities at amortised cost, class [member] | Financial liabilities at amortised cost, category [member] | Current financial debt [member] | Interest bearning accounts of associates payable on demand [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 2,085 1,836
Financial liabilities at amortised cost, class [member] | Financial liabilities at amortised cost, category [member] | Current financial debt [member] | Bank and other financial debt [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 976 719
Financial liabilities at amortised cost, class [member] | Financial liabilities at amortised cost, category [member] | Current financial debt [member] | Commercial paper [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 4,258 2,289
Financial liabilities at amortised cost, class [member] | Financial liabilities at amortised cost, category [member] | Non-current financial debt [member] | Straight bonds [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 28,298 22,167
Financial liabilities at amortised cost, class [member] | Financial liabilities at amortised cost, category [member] | Non-current financial debt [member] | Liabilities to banks and other financial institutions [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 233 188
Financial liabilities at amortised cost, class [member] | Financial liabilities at amortised cost, category [member] | Trade payables [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 5,403 5,424
Financial liabilities at amortised cost, class [member] | Financial liabilities at amortised cost, category [member] | Commitment for repurchase of own shares [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,769  
Financial liabilities at amortised cost, class [member] | Other financial liabilities, category [member] | Lease liabilities [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 2,005 1,949
Financial liabilities at amortised cost, class [member] | Other financial liabilities, category [member] | Other financial liabilities [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 2,005 1,949
Financial liabilities at fair value, class [member] | Financial liabilities at fair value through profit or loss, category [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,263 1,250
Financial liabilities at fair value, class [member] | Financial liabilities at fair value through profit or loss, category [member] | Contingent consideration and other financial liabilities [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,069 1,065
Financial liabilities at fair value, class [member] | Financial liabilities at fair value through profit or loss, category [member] | Derivative financial instruments [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities $ 194 $ 185