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Financial instruments - additional disclosures (Details 4) - Recurring fair value measurement [member] - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Cash and cash equivalents [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value   $ 2,010
Cash and cash equivalents [member] | Debt securities    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value   2,010
Marketable securities, time deposits and derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value $ 213 2,846
Marketable securities, time deposits and derivative financial instruments [member] | Debt securities    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 9  
Marketable securities, time deposits and derivative financial instruments [member] | Total available-for-sale marketable securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value   2,741
Marketable securities, time deposits and derivative financial instruments [member] | Derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 204 105
Financial investments and long-term loans [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 2,070 2,704
Financial investments and long-term loans [member] | Fund investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 281 366
Financial investments and long-term loans [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 1,182 1,697
Financial investments and long-term loans [member] | Contingent consideration receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 607 641
Associated companies at fair value through profit and loss [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 129 192
Contingent consideration receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 43  
Level 1 of fair value hierarchy [member] | Cash and cash equivalents [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value   2,010
Level 1 of fair value hierarchy [member] | Cash and cash equivalents [member] | Debt securities    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value   2,010
Level 1 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value   2,719
Level 1 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Total available-for-sale marketable securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value   2,719
Level 1 of fair value hierarchy [member] | Financial investments and long-term loans [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 493 1,108
Level 1 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Fund investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 20 28
Level 1 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 473 1,080
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 213 127
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Debt securities    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 9  
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Total available-for-sale marketable securities [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value   22
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Derivative financial instruments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 204 105
Level 2 of fair value hierarchy [member] | Financial investments and long-term loans [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 10  
Level 2 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 10  
Level 3 of fair value hierarchy [member] | Financial investments and long-term loans [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 1,567 1,596
Level 3 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Fund investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 261 338
Level 3 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Available-for-sale financial investments [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 699 617
Level 3 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Contingent consideration receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 607 641
Level 3 of fair value hierarchy [member] | Associated companies at fair value through profit and loss [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 129 $ 192
Level 3 of fair value hierarchy [member] | Contingent consideration receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value $ 43