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Financial instruments - additional disclosures (Details 14) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Equity securities $ 1,111 $ 1,158
Fair value of other financial assets sold 206 33
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 862 843
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 249 315
Alcon    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Equity securities 71 382
Fair value of other financial assets sold 331 976
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 13 62
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 $ 137 $ 33