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Financial instruments - additional disclosures (Details 6) - Recurring fair value measurement [member] - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value $ (1,263) $ (1,250)
Contingent consideration payables [member]    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value (1,046) (1,036)
Other financial liabilities [member]    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value (23) (29)
Derivative financial instruments [member]    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value (194) (185)
Level 2 of fair value hierarchy [member]    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value (194) (185)
Level 2 of fair value hierarchy [member] | Derivative financial instruments [member]    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value (194) (185)
Level 3 of fair value hierarchy [member]    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value (1,069) (1,065)
Level 3 of fair value hierarchy [member] | Contingent consideration payables [member]    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value (1,046) (1,036)
Level 3 of fair value hierarchy [member] | Other financial liabilities [member]    
Disclosure of fair value measurement of liabilities [line items]    
Financial liabilities, at fair value $ (23) $ (29)