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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
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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)

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