Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information [Line Items]
Revenues																	$ 5,524	$ 5,387	$ 5,430
Operating profit (loss)																	530	676	684
NET INCOME																	1,151	571	771
Net income attributable to Host Hotels & Resorts, Inc.																	$ 1,087	$ 564	$ 762
Basic earnings per common share																	$ 1.47	$ 0.76	$ 1.03
Diluted earnings per common share																	$ 1.47	$ 0.76	$ 1.02
HOST HOTELS & RESORTS, INC.
Quarterly Financial Information [Line Items]
Revenues	$ 1,361		$ 1,299		$ 1,518		$ 1,346		$ 1,344		$ 1,254		$ 1,441		$ 1,348
Operating profit (loss)	188		(92)		263		171		134		127		244		171
NET INCOME	306		378		211		256		93		105		212		161
Net income attributable to Host Hotels & Resorts, Inc.	$ 303		$ 322		$ 209		$ 253		$ 92		$ 104		$ 210		$ 158
Basic earnings per common share	$ 0.41		$ 0.43		$ 0.28		$ 0.34		$ 0.12		$ 0.14		$ 0.28		$ 0.21
Diluted earnings per common share	$ 0.41		$ 0.43		$ 0.28		$ 0.34		$ 0.12		$ 0.14		$ 0.28		$ 0.21
HOST HOTELS & RESORTS L.P.
Quarterly Financial Information [Line Items]
Revenues																	$ 5,524	$ 5,387	$ 5,430
Operating profit (loss)																	530	676	684
NET INCOME																	1,151	571	771
Net income attributable to Host Hotels & Resorts, Inc.	$ 307	[1]	$ 325	[1]	$ 211	[1]	$ 256	[1]	$ 93	[1]	$ 106	[1]	$ 212	[1]	$ 160	[1]	$ 1,099	$ 571	$ 771
Basic earnings per common share	$ 0.42	[1]	$ 0.44	[1]	$ 0.29	[1]	$ 0.35	[1]	$ 0.13	[1]	$ 0.14	[1]	$ 0.29	[1]	$ 0.22	[1]	$ 1.50	$ 0.78	$ 1.05
Diluted earnings per common share	$ 0.42	[1]	$ 0.44	[1]	$ 0.29	[1]	$ 0.35	[1]	$ 0.13	[1]	$ 0.14	[1]	$ 0.29	[1]	$ 0.22	[1]	$ 1.50	$ 0.78	$ 1.05

[1] Other income statement line items not presented for Host L.P. are equal to the amounts presented for Host Inc.