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Equity share capital - Summary of Cash Flow Hedge Reserves (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about hedged items [line items]      
Costs of hedging deferred and recognised in OCI $ (11) $ 0 $ 3
Deferred tax (11) 0 2
Reserve of Cash Flow Hedges [member]      
Disclosure of detailed information about hedged items [line items]      
Reserve Of Cash flow Hedges Beginning Balance (2) 0 5
Costs of hedging deferred and recognised in OCI (11)   3
Change in fair value of currency swaps recognised in OCI (113) (30) 33
Reclassified from OCI to profit or loss - included in financial expenses 165 28 (43)
Deferred tax (11)   2
Reserve Of Cash flow Hedges Ending Balance 28 (2) 0
Reserve of Cash Flow Hedges [member] | Cash flow hedge reserves [Member]      
Disclosure of detailed information about hedged items [line items]      
Reserve Of Cash flow Hedges Beginning Balance 6 8 16
Change in fair value of currency swaps recognised in OCI (113) (30) 33
Reclassified from OCI to profit or loss - included in financial expenses 165 28 (43)
Deferred tax (11)   2
Reserve Of Cash flow Hedges Ending Balance 47 6 8
Reserve of Cash Flow Hedges [member] | Costs of hedging reserve [member]      
Disclosure of detailed information about hedged items [line items]      
Reserve Of Cash flow Hedges Beginning Balance (8) (8) (11)
Costs of hedging deferred and recognised in OCI (11)   3
Change in fair value of currency swaps recognised in OCI 0    
Reclassified from OCI to profit or loss - included in financial expenses 0    
Deferred tax 0    
Reserve Of Cash flow Hedges Ending Balance $ (19) $ (8) $ (8)