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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
Jun. 30, 2020
Dec. 31, 2019
Disclosure of interest bearing financial instruments [line items]    
Carrying amount $ (106,022) $ (96,601)
Fair value (123,615) (113,983)
Australian Dollar [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (1,606) (1,647)
Fair value (1,697) (1,748)
Brazilian Real [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (560) (544)
Fair value (560) (542)
Canadian Dollar [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (1,958) (2,055)
Fair value (1,985) (2,046)
Euro [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (29,335) (25,346)
Fair value (30,868) (30,365)
Pound Sterling [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (4,063) (4,373)
Fair value (4,507) (4,816)
US Dollar [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (68,146) (62,205)
Fair value (83,644) (74,035)
Other currency [member]    
Disclosure of interest bearing financial instruments [line items]    
Carrying amount (354) (431)
Fair value $ (354) $ (431)