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Financial instruments - additional disclosures (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
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 $ 7,517 $ 10,397
Cash and cash equivalents [member] | Financial assets at fair value through other comprehensive income, category [member] | Cash and cash equivalents [member]    
Disclosure of financial assets [line items]    
Financial assets   2,010
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 874 5,980
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 9 2,741
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 37 34
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 828 1,195
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 1,581 1,772
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 650 641
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 129 192
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 204 105
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 317 468
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 281 366
Financial assets at amortised cost, class [member] | Financial assets at amortised cost, category [member]    
Disclosure of financial assets [line items]    
Financial assets 27,971 32,492
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 8,066 8,005
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 958 793
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 11,089 12,965
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 $ 341 $ 332