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Schedule of defined benefit plan information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Present Value Of The Obligation [Member]      
IfrsStatementLineItems [Line Items]      
Liabilities, ending $ 33 $ 25 $ 36
Current services cost 1 3 3
Cost for interest 13 16 15
Actuarial (gains) losses 1 (3) (2)
Benefit payments (2) (2) (2)
Gain on monetary position, net (5) (15) (18)
Reclassification to liabilities associated to assets classified as held for sale   (10)  
Liabilities, beginning 25 36 40
Fair Value Of Plan Assets [Member]      
IfrsStatementLineItems [Line Items]      
Liabilities, ending (4) (4) (5)
Current services cost (0) (0) (0)
Cost for interest (3) (2) (2)
Actuarial (gains) losses 2 1 (0)
Benefit payments (0) (0) (0)
Gain on monetary position, net 1 2 2
Reclassification to liabilities associated to assets classified as held for sale   (0)  
Liabilities, beginning (4) (5) (5)
Net Liability At The End Of The Year [Member]      
IfrsStatementLineItems [Line Items]      
Liabilities, ending 29 21 31
Current services cost 1 3 3
Cost for interest 10 14 13
Actuarial (gains) losses 3 (2) (2)
Benefit payments (2) (2) (2)
Gain on monetary position, net (4) (13) (16)
Reclassification to liabilities associated to assets classified as held for sale   (10)  
Liabilities, beginning $ 21 $ 31 $ 35