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Financial and capital risk management - Sensitivity analysis of derivative financial instruments (Details 1) - Risk U S Libor Decrease [Member]
$ in Millions
Dec. 31, 2022
USD ($)
U S Floating Rate Versus U S Fixed Swap Rate [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities $ 7
U S Floating Rate Versus U S Fixed Swap Rate [Member] | Scenario I  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities 3
U S Floating Rate Versus U S Fixed Swap Rate [Member] | Sensitivity Scenario Ii [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities (1)
Protected Item Libor U S Indexed Debt [Member] | Scenario I  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities (3)
Protected Item Libor U S Indexed Debt [Member] | Sensitivity Scenario Ii [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities $ 1