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Risks Arising from Financial Instruments - Summary of Carrying Amount of Fixed Rate Interest-Bearing Financial Liabilities and Fair Value (Detail) - Fixed interest rate [member] - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of interest bearing financial instruments [line items]    
Carrying amount $ (70,296) $ (69,682)
Fair value (70,343) (69,044)
US Dollar [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (41,050) (45,800)
Fair value (41,863) (45,558)
Euro [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (27,854) (21,915)
Fair value (27,187) (21,605)
Pound Sterling [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (519) (1,108)
Fair value (467) (1,046)
Canadian Dollar [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (509) (484)
Fair value (465) (461)
Other currency [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (364) (375)
Fair value $ (362) $ (373)