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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of detailed information about interest bearing liability and financing facility [line items]      
Beginning balance $ 4,874 $ 5,138  
Debt acquired through asset acquisitions [1] 169    
Repayments (169) [1],[2] (284) [2] $ (283)
Drawdowns [2] 5,150    
Fair value adjustment and foreign exchange movement   16  
Transaction costs capitalised and amortised (27) 4  
Ending balance 9,997 4,874 5,138
Current 990 (9) [3]  
Non-current 9,007 4,883  
Undrawn balance at 31 December 2,800 6,050  
US Bonds [member]      
Schedule of detailed information about interest bearing liability and financing facility [line items]      
Beginning balance 4,087 4,084  
Drawdowns [2] 2,000    
Transaction costs capitalised and amortised (18) 3  
Ending balance 6,069 4,087 4,084
Current 996 (3) [3]  
Non-current 5,073 4,090  
Medium Term Notes [member]      
Schedule of detailed information about interest bearing liability and financing facility [line items]      
Beginning balance 200 385  
Repayments [2]   (201)  
Fair value adjustment and foreign exchange movement   16  
Ending balance 200 200 385
Non-current 200 200  
Other [member]      
Schedule of detailed information about interest bearing liability and financing facility [line items]      
Debt acquired through asset acquisitions [1] 169    
Repayments [1],[2] (169)    
Liquidity Facilities [Member]      
Schedule of detailed information about interest bearing liability and financing facility [line items]      
Beginning balance (1)    
Transaction costs capitalised and amortised 1 (1)  
Ending balance   (1)  
Current [3]   (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 (6) (5)  
Drawdowns [2] 500    
Transaction costs capitalised and amortised 1 (1)  
Ending balance 495 (6) (5)
Current (2) (2) [3]  
Non-current 497 (4)  
Undrawn balance at 31 December 1,600 2,250  
Syndicate Facilities [member]      
Schedule of detailed information about interest bearing liability and financing facility [line items]      
Beginning balance 594 591  
Drawdowns [2] 1,650    
Transaction costs capitalised and amortised (11) 3  
Ending balance 2,233 594 591
Current (4) (3) [3]  
Non-current 2,237 597  
Undrawn balance at 31 December 1,200 2,000  
JBIC facility [member]      
Schedule of detailed information about interest bearing liability and financing facility [line items]      
Beginning balance   83  
Repayments [2]   $ (83)  
Drawdowns [2] 1,000    
Transaction costs capitalised and amortised 0    
Ending balance 1,000   $ 83
Non-current $ 1,000    
[1] Refer to Note B.7 for details on asset acquisitions. The debt acquired through asset acquisitions was repaid during the year.
[2] Included in cash flows classified within financing activities in the consolidated statement of cash flows.
[3] The balance relates to capitalised costs amortised within 12 months. This balance was reclassified to other assets (current) for presentation on the consolidated statement of financial position.