Dispositions - Additional Information (Detail) $ in Millions	1 Months Ended	6 Months Ended
May 31, 2018 USD ($)	Jun. 30, 2018 USD ($) Hotel
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of hotel portfolio properties sold \| Hotel		12
Gross proceeds on sale of hotel portfolio properties		$ 387
Net gain on sale of hotel portfolio properties		96
Reclassification of currency translation adjustment from accumulated other comprehensive loss to earnings on disposition of hotel portfolio properties		$ 31
Hilton Berlin [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gross proceeds on sale of hotel portfolio properties	$ 375
Pro-rata share amount before customary closing adjustments	150
Net gain on sale of hotel portfolio properties	108
Reclassification of currency translation adjustment from accumulated other comprehensive loss to earnings on disposition of hotel portfolio properties	$ 8

Number of hotel portfolio properties sold.

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Pro-rata share before customary closing adjustments amount.

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Reclassification of currency translation adjustment from accumulated other comprehensive loss to earnings on disposition of hotel portfolio properties.

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Reclassification of currency translation adjustment from accumulated other comprehensive loss to earnings on disposition of unconsolidated equity method investments.

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
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-Topic 230
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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-Publisher FASB
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-Section 50
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-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

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Amount of gain (loss) on sale or disposal of an equity method investment.

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

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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The cash inflow associated with the amount received from the sale of a business segment or subsidiary or sale of an entity that is related to it but not strictly controlled during the period (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

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