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Related party disclosures - Summary of Related Party Disclosures for Associates and Joint Ventures (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of transactions between related parties [Line Items]
Revenue from associates and joint ventures	$ 10	$ 9	$ 6
Loans to associates	0		9
Other amounts owed by associates and joint ventures	1	2	1
Amounts owed to associates and joint ventures	2
Associates [member]
Disclosure of transactions between related parties [Line Items]
Revenue from associates and joint ventures	9	8	5
Loans to associates	0		9
Other amounts owed by associates and joint ventures	1	2	1
Amounts owed to associates and joint ventures	2
Joint ventures [member]
Disclosure of transactions between related parties [Line Items]
Revenue from associates and joint ventures	1	$ 1	$ 1
Loans to associates	0
Other amounts owed by associates and joint ventures	0
Amounts owed to associates and joint ventures	$ 0

X

- Definition

The amounts payable resulting from related party transactions. [Refer: Related parties [member]]

+ References

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- Definition

The amounts receivable resulting from related party transactions. [Refer: Related parties [member]]

+ References

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- Definition

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+ References

No definition available.

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- Definition

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- Definition

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