Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

No definition available.

Name:	dei_AmendmentFlag
Namespace Prefix:	dei_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

- Definition

PCAOB issued Audit Firm Identifier

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form 10-K
-Number 249
-Section 310

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form 20-F
-Number 249
-Section 220
-Subsection f

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form 40-F
-Number 249
-Section 240
-Subsection f

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
Document and Entity Information - USD ($) $ in Billions	Dec. 31, 2021	Feb. 14, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Registrant Name	MID-AMERICA APARTMENT COMMUNITIES, INC.
Entity Central Index Key	0000912595
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		115,341,027
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 13.8
Entity Emerging Growth Company	false
Entity Small Business	false
Entity File Number	001-12762
Entity Incorporation, State or Country Code	TN
Entity Tax Identification Number	62-1543819
Entity Address, Address Line One	6815 Poplar Avenue
Entity Address, Address Line Two	Suite 500
Entity Address, City or Town	Germantown
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	38138
City Area Code	901
Local Phone Number	682-6600
Document Annual Report	true
ICFR Auditor Attestation Flag	true
Document Transition Report	false
Documents Incorporated By Reference	Documents Incorporated by Reference Portions of the proxy statement for the annual shareholders meeting of Mid-America Apartment Communities, Inc. to be held on May 17, 2022 are incorporated by reference into Part III of this report. We expect to file our proxy statement within 120 days after December 31, 2021
Auditor Name	Ernst & Young LLP
Auditor Location	Memphis, Tennessee
Auditor Firm ID	42
Common Stock [Member]
Document Information [Line Items]
Trading Symbol	MAA
Security Exchange Name	NYSE
Title of 12(b) Security	Common Stock, par value $.01 per share
Cumulative Preferred Stock [Member]
Document Information [Line Items]
Trading Symbol	MAA*I
Security Exchange Name	NYSE
Title of 12(b) Security	8.50% Series I Cumulative Redeemable Preferred Stock, $.01 par value per share
Limited Partner [Member]
Document Information [Line Items]
Entity Registrant Name	MID-AMERICA APARTMENTS, L.P.
Entity Central Index Key	0001581776
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Entity Well-known Seasoned Issuer	No
Entity Emerging Growth Company	false
Entity Small Business	false
Entity File Number	333-190028-01
Entity Incorporation, State or Country Code	TN
Entity Tax Identification Number	62-1543816
Entity Address, Address Line One	6815 Poplar Avenue
Entity Address, Address Line Two	Suite 500
Entity Address, City or Town	Germantown
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	38138
City Area Code	901
Local Phone Number	682-6600
ICFR Auditor Attestation Flag	false