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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Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Commitments and Contingencies - Pension Trust Litigation (Details)	Sep. 30, 2020 property	Mar. 24, 2016 hotel
Loss Contingencies [Line Items]
Number of real estate properties \| property	28
InterContinental Hotels Group PLC
Loss Contingencies [Line Items]
Number of real estate properties \| hotel		3