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Financial instruments - additional disclosures (Details 12)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Equity securities $ 828 $ 1,195
Fair value of other financial assets sold 3 254
Listed equity securities [member]    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Equity securities $ 438 $ 888
Number of investments in equity instruments designated at fair value through other comprehensive income 46 40
Non-listed equity securities [member]    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Equity securities $ 390 $ 307
Number of investments in equity instruments designated at fair value through other comprehensive income 65 60
Alcon    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Fair value of other financial assets sold $ 22 $ 9
Alcon | Total fair value adjustments    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Gain (loss) on sale of other financial assets 7 1
Others | Total fair value adjustments    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Gain (loss) on sale of other financial assets $ 3 $ 211