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Financial instruments - additional disclosures (Details 1) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Financial liabilities at amortised cost, class [member] | Financial liabilities at amortised cost, category [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities $ 31,266 $ 37,491
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   1,814
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 863 899
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 2,772 893
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 22,341 25,296
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 144 227
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 5,146 5,553
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   2,809
Financial liabilities at amortised cost, class [member] | Other financial liabilities, category [member] | Lease liabilities [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,789 1,896
Financial liabilities at amortised cost, class [member] | Other financial liabilities, category [member] | Other financial liabilities [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,789 1,896
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 1,122 1,162
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 1,067 1,094
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 $ 55 $ 68