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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
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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)

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- Definition Fixed rate interest bearing loans carrying value. + References No definition available. + Details
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- Definition Fixed rate interest bearing loans fair value. + References No definition available. + Details
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- Details
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