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Retirement benefits - Summary of Plan Assets Measured at Fair Value (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of defined benefit plans [line items] |  |
Fair value of plan assets | $ 0 | $ 152
United States [member] |  |
Disclosure of defined benefit plans [line items] |  |
Fair value of plan assets | 0 | 152
United States [member] | Investments quoted in active markets [member] |  |
Disclosure of defined benefit plans [line items] |  |
Investment funds: fixed income securities | 0 | 150
United States [member] | Unquoted investments [member] |  |
Disclosure of defined benefit plans [line items] |  |
Cash | $ 0 | $ 2

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- Definition The amount that cash and cash equivalents constitute of the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 142 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_142_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount that investment funds constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]; Investment funds [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 142 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_142_f&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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- Details
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