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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, 2021
Dec. 31, 2020
Disclosure of interest bearing financial instruments [line items]    
Carrying amount $ (86,520) $ (94,602)
Fair value (104,836) (118,536)
Australian Dollar [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (324) (846)
Fair value (366) (964)
Brazilian Real [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (420) (578)
Fair value (419) (578)
Canadian Dollar [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (626) (613)
Fair value (605) (633)
Euro [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (21,654) (26,092)
Fair value (23,801) (29,809)
Pound Sterling [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (3,611) (3,655)
Fair value (3,913) (4,301)
US Dollar [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (59,399) (62,340)
Fair value (75,261) (81,771)
Other currency [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (486) (479)
Fair value $ (471) $ (480)