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Investments in subsidiaries, associates and joint ventures - Changes in the year (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Investments In Subsidiaries Associates And Joint Ventures
Balance at the beginning	$ 1,751	$ 2,031
Capital contribution to CSP		42
Equity results in income statement	246	494
Dividends declared	(186)	(228)
Translation adjustment	116	(128)
Impairment of CSP	(111)
Transfer the equity results to discontinued operations (note 16a)		(26)
Transfer of CSI to assets held for sale (nota 16c)		(377)
Others	(18)	(57)
Balance at the end	$ 1,798	$ 1,751

X

- Definition

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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- Definition

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
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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
-Note Effective on first application of IFRS 9
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- Definition

The amount of dividend declared by associates and joint ventures accounted for using equity method. The dividend declared is a reduction of the carrying value of the investments and joint ventures.

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Investments In Associates And Joint Ventures Accounted For Using Equity Method, Transferred To Discontinued Operations

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The carrying amount of investment in joint ventures and associates transferred to held for sale.

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- Definition

Amount of increase (decrease) in investments in joint ventures and associates related to foreign currency translation (gain) loss and other increases (decreases).

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The amount of increase (decrease) in investment in joint ventures and associates that the entity does not separately disclose in the same statement or note.

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