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Investment in Associates and Joint Ventures - Summary of Investments in Associates and Joint Ventures (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of associates and joint ventures [line items]
Beginning balance		$ 110	$ 104
Share of (losses)/gains		14	3	$ 1
Ending balance		81	110	104
Cost [member]
Disclosure of associates and joint ventures [line items]
Beginning balance		145	140
Additions		17	14
Share of (losses)/gains		(14)	(3)
System Fund share of losses		(1)
Dividends and distributions		(7)	(7)
Exchange and other		(4)	1
Ending balance		136	145	140
Accumulated impairment [member]
Disclosure of associates and joint ventures [line items]
Beginning balance		(35)	(36)
Charge for the year	[1]	(23)
Exchange and other		3	1
Ending balance		$ (55)	$ (35)	$ (36)
[1] In note 6 the $23m impairment charge is presented net of $4m gain on related put option.

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The amount of dividends received.

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The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2020-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Additions to associates and joint ventures.

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

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Increase Decrease Through Exchange And Other Adjustments To Investment in Associates And Joint Ventures

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