Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2020	Mar. 05, 2021	Dec. 15, 2020
Document Information [Line Items]
Entity Registrant Name	APARTMENT INCOME REIT CORP.
Entity Central Index Key	0001820877
Document Type	10-K/A
Amendment Flag	true
Amendment Description	This amendment amends the Annual Report on Form 10-K of the Company for the year ended December 31, 2020, that was originally filed with the SEC on March 15, 2021 (the “Original Filing”). The Company is filing this amendment for the purpose of providing the information required by Items 10, 11, 12, 13, and 14 of Part III. This information was previously omitted from the Original Filing in reliance on General Instruction G(3) to Form 10-K, which permits the information in the above referenced items to be incorporated in the Form 10-K by reference from a definitive proxy statement if such statement is filed no later than 120 days after the Company’s fiscal year end.
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Trading Symbol	AIRC
Entity File Number	1-39686
Entity Tax Identification Number	84-1299717
Entity Incorporation State Country Code	MD
Entity Address, Address Line One	4582 South Ulster Street
Entity Address, Address Line Two	Suite 1700
Entity Address City Or Town	Denver
Entity Address State Or Province	CO
Entity Address Postal Zip Code	80237
City Area Code	303
Local Phone Number	757-8101
Entity Common Stock, Shares Outstanding		148,985,740
Title of 12(b) Security	Class A Common Stock (Apartment Income REIT Corp.)
Security Exchange Name	NYSE
Document Annual Report	true
Document Transition Report	false
Entity Voluntary Filers	No
Entity Well Known Seasoned Issuer	No
Documents Incorporated by Reference	None
Entity Public Float			$ 5.6
ICFR Auditor Attestation Flag	true
AIMCO Properties, LP [Member]
Document Information [Line Items]
Entity Registrant Name	AIMCO PROPERTIES, L.P.
Entity Central Index Key	0000926660
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity File Number	0-24497
Entity Tax Identification Number	84-1275621
Entity Incorporation State Country Code	DE
Entity Address, Address Line One	4582 South Ulster Street
Entity Address, Address Line Two	Suite 1700
Entity Address City Or Town	Denver
Entity Address State Or Province	CO
Entity Address Postal Zip Code	80237
City Area Code	303
Local Phone Number	757-8101
Entity Voluntary Filers	No
Entity Well Known Seasoned Issuer	No
ICFR Auditor Attestation Flag	true