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Interest Bearing Liabilities and Financing Facilities - Summary of Interest Bearing Liability and Financing Facility (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of detailed information about interest bearing liability and financing facility [line items]      
Beginning balance $ 5,138 $ 5,430  
Repayments (284) (283) $ (784)
Fair value adjustment and foreign exchange movement 16 (7)  
Transaction costs capitalised and amortised 4 (2)  
Ending balance 4,874 5,138 5,430
Current (9) 260  
Non-current 4,883 4,878  
Undrawn balance at 31 December 6,050 4,050  
US Bonds [member]      
Schedule of detailed information about interest bearing liability and financing facility [line items]      
Beginning balance 4,084 4,081  
Transaction costs capitalised and amortised 3 3  
Ending balance 4,087 4,084 4,081
Current (3) (3)  
Non-current 4,090 4,087  
Medium Term Notes [member]      
Schedule of detailed information about interest bearing liability and financing facility [line items]      
Beginning balance 385 592  
Repayments (201) (200)  
Fair value adjustment and foreign exchange movement 16 (7)  
Ending balance 200 385 592
Current   185  
Non-current 200 200  
Liquidity Facilities [Member]      
Schedule of detailed information about interest bearing liability and financing facility [line items]      
Transaction costs capitalised and amortised (1)    
Ending balance (1)    
Current (1)    
Undrawn balance at 31 December 1,800    
Bilateral facilities [member]      
Schedule of detailed information about interest bearing liability and financing facility [line items]      
Beginning balance (5) (4)  
Transaction costs capitalised and amortised (1) (1)  
Ending balance (6) (5) (4)
Current (2) (2)  
Non-current (4) (3)  
Undrawn balance at 31 December 2,250 2,050  
Syndicate Facilities [member]      
Schedule of detailed information about interest bearing liability and financing facility [line items]      
Beginning balance 591 595  
Transaction costs capitalised and amortised 3 (4)  
Ending balance 594 591 595
Current (3) (3)  
Non-current 597 594  
Undrawn balance at 31 December 2,000 2,000  
JBIC facility [member]      
Schedule of detailed information about interest bearing liability and financing facility [line items]      
Beginning balance 83 166  
Repayments $ (83) (83)  
Ending balance   83 $ 166
Current   $ 83