Supplemental Schedule of Noncash Investing and Financing Activities (Host Hotels & Resorts, Inc) - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Redemptions of limited partner interests for common stock (shares)	0.7	0.3	0.6
Redemptions of limited partner interests for common stock	$ 15	$ 6	$ 10

The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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Name:	us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration