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Interest Bearing Liabilities and Financing Facilities - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jul. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2024
Interest bearing liabilities and financing facilities [line items]          
Loan Facilities Drawdown   $ 500      
Repayments of borrowings, classified as financing activities     $ 41    
Undrawn borrowing facilities   6,500   $ 6,050  
Cancellation of undrawn borrowing facilities   1,550      
Syndicate Term Loan [Member]          
Interest bearing liabilities and financing facilities [line items]          
Borrowings   $ 450      
CHF Medium Term Note [Member]          
Interest bearing liabilities and financing facilities [line items]          
Repayments of borrowings, classified as financing activities       201  
Syndicated facility [member]          
Interest bearing liabilities and financing facilities [line items]          
Borrowings maturity   10 years      
JBIC facility [member]          
Interest bearing liabilities and financing facilities [line items]          
Borrowings maturity   10 years      
JBIC facility [member] | Loan commitments [member]          
Interest bearing liabilities and financing facilities [line items]          
Borrowings   $ 1,000      
JBIC facility [member]          
Interest bearing liabilities and financing facilities [line items]          
Repayments of borrowings, classified as financing activities $ 83        
Unsecured bonds [member]          
Interest bearing liabilities and financing facilities [line items]          
Financial liabilities carrying amount       4,087 $ 4,087
Financial liabilities at fair value       3,936 3,958
Medium Term Notes [member]          
Interest bearing liabilities and financing facilities [line items]          
Financial liabilities carrying amount       200 200
Financial liabilities at fair value       $ 188 $ 188