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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, 2017	Dec. 31, 2016
Material Income And Expense [Abstract]
Premium charges for redemption of bonds	$ 238	$ 441
Unamortized Debt Issuance Costs and Fees	14	42
Fair value hedge adjustment	$ 4	$ (159)

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- References

No definition available.

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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 2016-01-13
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2016-03-30&anchor=para_17&doctype=Standard
-URIDate 2016-03-31

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- Definition

Fair value hedge adjustment.

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No definition available.

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- Definition

The premium charge associated with the redemption of bonds.

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No definition available.

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