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Risks arising from Financial instruments - Summary of Hedging Reserve and Hedging Instruments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about hedging instruments [line items]    
As per 1 January $ 181 $ 145
Change in fair value of hedging instrument recognized in OCI 573 (434)
Reclassified to profit or loss / cost of inventory (264) 470
As per 31 December 490 181
Commodity Contracts [member]    
Disclosure of detailed information about hedging instruments [line items]    
As per 1 January (304) (476)
Change in fair value of hedging instrument recognized in OCI 54 (197)
Reclassified to profit or loss / cost of inventory 9 368
As per 31 December (241) (304)
Foreign currency futures contract & others [member]    
Disclosure of detailed information about hedging instruments [line items]    
As per 1 January 486 621
Change in fair value of hedging instrument recognized in OCI 519 (237)
Reclassified to profit or loss / cost of inventory (273) 102
As per 31 December $ 731 $ 486