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Schedule of financial instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Financial assets at amortized cost $ 512 $ 561
Financial assets at fair value through profit and loss 601  
Subtotal financial assets 1,113 971
Non financial assets 25 15
Total assets 1,138 986
Financial liabilities at amortized cost 1,628 1,744
Financial liabilities at fair value through profit and loss  
Subtotal financial liabilities 1,628 1,744
Non financial liabilities 4 2
Total liabilities 1,632 1,746
Financial assets at fair value through profit and loss   410
Trade And Other Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at amortized cost 190 130
Financial liabilities at fair value through profit and loss
Subtotal financial liabilities 190 130
Non financial liabilities 4 2
Total liabilities 194 132
Borrowing [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at amortized cost 1,438 1,614
Financial liabilities at fair value through profit and loss
Subtotal financial liabilities 1,438 1,614
Non financial liabilities
Total liabilities 1,438 1,614
Trade Receivables And Other Receivables [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at amortized cost 376 366
Financial assets at fair value through profit and loss 30 3
Subtotal financial assets 406 369
Non financial assets 25 15
Total assets 431 384
Financial Assets At Amortized Cost [Member] | Term Deposit [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at amortized cost 100 100
Financial assets at fair value through profit and loss  
Subtotal financial assets 100 100
Non financial assets
Total assets 100 100
Financial Assets At Amortized Cost [Member] | Other [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at amortized cost 10  
Financial assets at fair value through profit and loss  
Subtotal financial assets 10  
Non financial assets  
Total assets 10  
Financial Assets At Amortized Cost [Member] | Corporate Securities [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at amortized cost   25
Subtotal financial assets   25
Non financial assets  
Total assets   25
Financial Assets At Fair Value Through Profit And Loss [Member] | Government Securities [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at amortized cost
Financial assets at fair value through profit and loss 278 204
Subtotal financial assets 278 204
Non financial assets
Total assets 278 204
Financial Assets At Fair Value Through Profit And Loss [Member] | Corporate Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at amortized cost  
Financial assets at fair value through profit and loss 19  
Subtotal financial assets 19  
Non financial assets  
Total assets 19  
Financial Assets At Fair Value Through Profit And Loss [Member] | Shares [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at amortized cost
Financial assets at fair value through profit and loss 149 40
Subtotal financial assets 149 40
Non financial assets
Total assets 149 40
Financial Assets At Fair Value Through Profit And Loss [Member] | Investment funds [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at amortized cost
Financial assets at fair value through profit and loss 41 92
Subtotal financial assets 41 92
Non financial assets
Total assets 41 92
Cash And Cash Equivalent [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at amortized cost 26 70
Financial assets at fair value through profit and loss 84  
Subtotal financial assets 110 141
Non financial assets
Total assets $ 110 141
Financial Assets At Fair Value Through Profit And Loss Deferred Tax Assets [Member] | Cash And Cash Equivalent [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit and loss   $ 71