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Other Financial Assets - Schedule of Fair Value and Dividend Income of Significant Investments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Equity securities measured at fair value	$ 116
Dividend income	14	$ 11	$ 9
InterContinental The Willard Washington DC [member]
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Equity securities measured at fair value	31
Dividend income	0
InterContinental San Francisco [member]
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Equity securities measured at fair value	31
Dividend income	6
InterContinental Grand Stanford Hong Kong [member]
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Equity securities measured at fair value	16
Dividend income	2
Other [member]
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]
Equity securities measured at fair value	38
Dividend income	$ 1

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income]

+ References

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

The amount of operating income (expense) that the entity does not separately disclose in the same statement or note.

+ References

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