Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 19, 2021	Jun. 30, 2020
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Trading Symbol	HST
Entity Registrant Name	HOST HOTELS & RESORTS, INC.
Entity Central Index Key	0001070750
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Security Exchange Name	NASDAQ
Documents Incorporated by Reference [Text Block]	Portions of Host Hotels & Resorts, Inc.’s definitive proxy statement to be filed with the Securities and Exchange Commission and delivered to stockholders in connection with its annual meeting of stockholders to be held on May 20, 2021 are incorporated by reference into Part III of this Form 10-K.
Document Annual Report	true
Document Transition Report	false
Title of 12(b) Security	Common Stock, $.01 par value
Entity File Number	001-14625
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	53-0085950
Entity Address, Address Line One	4747 Bethesda Avenue
Entity Address, Address Line Two	Suite 1300
Entity Address, City or Town	Bethesda
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	20814
City Area Code	240
Local Phone Number	744-1000
Entity Common Stock, Shares Outstanding		705,364,549
Entity Interactive Data Current	Yes
Entity Public Float			$ 7,512,950,865
ICFR Auditor Attestation Flag	true
HOST HOTELS & RESORTS L.P.
Document Information [Line Items]
Entity Registrant Name	HOST HOTELS & RESORTS, L.P.
Entity Central Index Key	0001061937
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity File Number	0-25087
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	52-2095412
Entity Address, Address Line One	4747 Bethesda Avenue
Entity Address, Address Line Two	Suite 1300
Entity Address, City or Town	Bethesda
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	20814
City Area Code	240
Local Phone Number	744-1000
Entity Common Stock, Shares Outstanding		697,748,677
Entity Interactive Data Current	Yes