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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
Aug. 28, 2015
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Schedule of detailed information about interest bearing liability and financing facility [line items]        
Beginning balance   $ 5,430 $ 6,214  
Repayments   (283) (784) $ (83)
Fair value adjustment and foreign exchange movement   (7) (5)  
Transaction costs capitalised and amortised   (2) 5  
Ending balance   5,138 5,430 6,214
Current   260 277  
Non-current   4,878 5,153  
Undrawn balance at 31 December   4,050 3,100  
US Bonds [member]        
Schedule of detailed information about interest bearing liability and financing facility [line items]        
Beginning balance   4,081 4,778  
Repayments     (700)  
Transaction costs capitalised and amortised   3 3  
Ending balance   4,084 4,081 4,778
Current   (3) (2)  
Non-current   4,087 4,083  
Medium Term Notes [member]        
Schedule of detailed information about interest bearing liability and financing facility [line items]        
Beginning balance   592 597  
Repayments   (200)    
Fair value adjustment and foreign exchange movement   (7) (5)  
Transaction costs capitalised and amortised   0    
Ending balance   385 592 597
Current   185 200  
Non-current   200 392  
Bilateral facilities [member]        
Schedule of detailed information about interest bearing liability and financing facility [line items]        
Beginning balance   (4) (4)  
Transaction costs capitalised and amortised   (1)    
Ending balance   (5) (4) (4)
Current   (2) (2)  
Non-current   (3) (2)  
Undrawn balance at 31 December   2,050 1,900  
Syndicate Facilities [member]        
Schedule of detailed information about interest bearing liability and financing facility [line items]        
Beginning balance   595 593  
Transaction costs capitalised and amortised   (4) 2  
Ending balance   591 595 593
Current   (3) (2)  
Non-current   594 597  
Undrawn balance at 31 December   2,000 1,200  
JBIC facility [member]        
Schedule of detailed information about interest bearing liability and financing facility [line items]        
Beginning balance   166 250  
Repayments   (83) (84)  
Transaction costs capitalised and amortised   0    
Ending balance   83 166 $ 250
Current   $ 83 83  
Non-current     $ 83  
JBIC facility [member] | US Bonds [member]        
Schedule of detailed information about interest bearing liability and financing facility [line items]        
Repayments $ (83)