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Financial instruments - additional disclosures (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Cash and cash equivalents [member] | Financial assets at amortised cost, category [member] | Cash and cash equivalents [member]    
Disclosure of financial assets [line items]    
Financial assets $ 9,658 $ 11,112
Financial assets at fair value, class [member] | Financial assets at fair value through other comprehensive income, category [member]    
Disclosure of financial assets [line items]    
Financial assets 1,173 1,215
Financial assets at fair value, class [member] | Financial assets at fair value through other comprehensive income, category [member] | Available-for-sale marketable securities [member] | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets 26 24
Financial assets at fair value, class [member] | Financial assets at fair value through other comprehensive income, category [member] | Available-for-sale long-term financial investments [member] | Debt securities [member]    
Disclosure of financial assets [line items]    
Financial assets 36 33
Financial assets at fair value, class [member] | Financial assets at fair value through other comprehensive income, category [member] | Available-for-sale long-term financial investments [member] | Equity securities [member]    
Disclosure of financial assets [line items]    
Financial assets 1,111 1,158
Financial assets at fair value, class [member] | Financial assets at fair value through profit or loss, category [member]    
Disclosure of financial assets [line items]    
Financial assets 1,827 1,323
Financial assets at fair value, class [member] | Financial assets at fair value through profit or loss, category [member] | Contingent consideration receivables [member]    
Disclosure of financial assets [line items]    
Financial assets 625 399
Financial assets at fair value, class [member] | Financial assets at fair value through profit or loss, category [member] | Associated companies at fair value through profit and loss [member]    
Disclosure of financial assets [line items]    
Financial assets 211 186
Financial assets at fair value, class [member] | Financial assets at fair value through profit or loss, category [member] | Derivative financial instruments [member]    
Disclosure of financial assets [line items]    
Financial assets 159 102
Financial assets at fair value, class [member] | Financial assets at fair value through profit or loss, category [member] | Available-for-sale marketable securities [member] | Fund investments [member]    
Disclosure of financial assets [line items]    
Financial assets   37
Financial assets at fair value, class [member] | Financial assets at fair value through profit or loss, category [member] | Available-for-sale long-term financial investments [member] | Equity securities [member]    
Disclosure of financial assets [line items]    
Financial assets 466 366
Financial assets at fair value, class [member] | Financial assets at fair value through profit or loss, category [member] | Available-for-sale long-term financial investments [member] | Fund investments [member]    
Disclosure of financial assets [line items]    
Financial assets 366 233
Financial assets at amortised cost, class [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Financial assets 20,744 21,839
Financial assets at amortised cost, class [member] | Financial assets at amortised cost, category [member] | Trade receivables [member]    
Disclosure of financial assets [line items]    
Financial assets 8,217 8,301
Financial assets at amortised cost, class [member] | Financial assets at amortised cost, category [member] | Other current assets [member]    
Disclosure of financial assets [line items]    
Financial assets 963 2,036
Financial assets at amortised cost, class [member] | Financial assets at amortised cost, category [member] | Time deposits with original maturity more than 90 days [member]    
Disclosure of financial assets [line items]    
Financial assets 1,609 61
Financial assets at amortised cost, class [member] | Financial assets at amortised cost, category [member] | Long-term loans and receivables from customers and finance lease, advances, security deposits [member]    
Disclosure of financial assets [line items]    
Financial assets $ 297 $ 329