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Details of treasury and other financial risks - Credit risk with number of counterparties (Detail)
Dec. 31, 2023
Range 100-500 million [Member]  
Details of treasury and other financial risks [Line Items]  
Counterparties 8
Range 100-500 million [Member] | AAA rated [Member]  
Details of treasury and other financial risks [Line Items]  
Counterparties 4
Range 100-500 million [Member] | A+ rated [Member]  
Details of treasury and other financial risks [Line Items]  
Counterparties 3
Range 100-500 million [Member] | A rated [Member]  
Details of treasury and other financial risks [Line Items]  
Counterparties 1
Range 10-100 million [Member]  
Details of treasury and other financial risks [Line Items]  
Counterparties 6
Range 10-100 million [Member] | AA- Rated [Member]  
Details of treasury and other financial risks [Line Items]  
Counterparties 1
Range 10-100 million [Member] | A+ rated [Member]  
Details of treasury and other financial risks [Line Items]  
Counterparties 2
Range 10-100 million [Member] | A rated [Member]  
Details of treasury and other financial risks [Line Items]  
Counterparties 2
Range 10-100 million [Member] | A- rated [Member]  
Details of treasury and other financial risks [Line Items]  
Counterparties 1