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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, 2024
Dec. 31, 2023
Disclosure of interest bearing financial instruments [line items]    
Carrying amount $ (69,682) $ (73,449)
Fair value (69,044) (75,135)
US Dollar [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (45,800) (49,917)
Fair value (45,558) (52,268)
Euro [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (21,915) (20,379)
Fair value (21,605) (19,796)
Pound Sterling [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (1,108) (2,069)
Fair value (1,046) (2,012)
Canadian Dollar [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (484) (526)
Fair value (461) (505)
Other currency [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (375) (558)
Fair value $ (373) $ (554)