Earnings (Loss) Per Common Share Or Unit (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2019	[1]	Sep. 30, 2019	[1]	Jun. 30, 2019	[1]	Mar. 31, 2019	[1]	Dec. 31, 2018	[1]	Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share Diluted [Line Items]
NET INCOME																	$ 932	$ 1,151	$ 571
Less: Net income attributable to non-controlling interests																	(12)	(64)	(7)
NET INCOME ATTRIBUTABLE TO REPORTING ENTITY																	$ 920	$ 1,087	$ 564
Basic weighted average shares outstanding																	730.3	739.8	738.6
Assuming distribution of common shares granted under the comprehensive stock plans, less shares assumed purchased at market																	0.8	0.8	0.5
Diluted weighted average shares/units outstanding																	731.1	740.6	739.1
Basic earnings per common share																	$ 1.26	$ 1.47	$ 0.76
Diluted earnings per common share																	$ 1.26	$ 1.47	$ 0.76
Assuming distribution of common units to support shares granted under the comprehensive stock plans, less shares assumed purchased at market																	0.8	0.8	0.5
Basic earnings per common share																	$ 1.26	$ 1.47	$ 0.76
Diluted earnings per common share																	$ 1.26	$ 1.47	$ 0.76
HOST HOTELS & RESORTS L.P.
Earnings Per Share Diluted [Line Items]
NET INCOME																	$ 932	$ 1,151	$ 571
Less: Net income attributable to non-controlling interests																	(2)	(52)
NET INCOME ATTRIBUTABLE TO REPORTING ENTITY	$ 81		$ 372		$ 289		$ 188		$ 307		$ 325		$ 211		$ 256		$ 930	$ 1,099	$ 571
Basic weighted average shares outstanding																	722.5	732.2	731.5
Assuming distribution of common shares granted under the comprehensive stock plans, less shares assumed purchased at market																	0.8	0.8	0.5
Diluted weighted average shares/units outstanding																	723.3	733.0	732.0
Basic earnings per common share	$ 0.11		$ 0.52		$ 0.40		$ 0.26		$ 0.42		$ 0.44		$ 0.29		$ 0.35		$ 1.29	$ 1.50	$ 0.78
Diluted earnings per common share	0.11		0.52		0.40		0.26		0.42		0.44		0.29		0.35		$ 1.29	$ 1.50	$ 0.78
Assuming distribution of common units to support shares granted under the comprehensive stock plans, less shares assumed purchased at market																	0.8	0.8	0.5
Basic earnings per common share	0.11		0.52		0.40		0.26		0.42		0.44		0.29		0.35		$ 1.29	$ 1.50	$ 0.78
Diluted earnings per common share	$ 0.11		$ 0.52		$ 0.40		$ 0.26		$ 0.42		$ 0.44		$ 0.29		$ 0.35		$ 1.29	$ 1.50	$ 0.78

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