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Cost Analysis - Summary of Depreciation, Amortisation and Impairment Analysis (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of fair value measurement of assets [line items]
Impairment Loss	$ 0	$ 827	$ 8
Investments accounted for using equity method [member]
Disclosure of fair value measurement of assets [line items]
Impairment Loss		$ 154

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

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- Definition

The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]]

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