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Finance income and finance costs - Summary of finance income and finance costs (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Material income and expense [abstract]
Premium charges for redemption of bonds	$ 72	$ 238
Unamortized Debt Issuance Costs and Fees	9	14
Fair value hedge adjustment	16	$ (4)
Reclassification of cost of hedging out of reserves	$ 3

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- References

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- Definition

The cash outflow for debt issue costs.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2019-01-01
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_17&doctype=Standard
-URIDate 2019-03-27

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- Definition

Fair value hedge adjustment.

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- Definition

Reclassification of cost of hedging to income statement and recognised within finance costs.

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- Definition

The premium charge associated with the redemption of bonds.

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