Earnings per Share and per Unit - Reconciliations of the numerator and denominator (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Antidilutive securities excluded from diluted EPS calculation (in shares)		1,500
Schedule of Earnings Per Share and Per Unit [Line Items]
Dividends declared per common share (in dollars per share)	$ 1.80	$ 1.74	$ 40.12
Diluted Earnings per Share:
Income from discontinued operations attributable to AIR common stockholders	$ 0	$ 0	$ 11,632
Basic net income (loss) attributable to AIR	903,642	447,124	(104,329)
Effect of dilutive instruments	6,388	0	0
Dilutive net income (loss) attributable to the AIR Operating Partnership's common unitholders	$ 910,030	$ 447,124	$ (104,329)
Basic weighted-average common shares/unit outstanding	154,093	154,135	122,446
Dilutive common share/unit equivalents outstanding	2,494	368	0
Dilutive common share equivalents outstanding	156,587	154,503	122,446
Income (loss) from continuing operations attributable to AIR per common share	$ 5.86	$ 2.90	$ (0.94)
Income (loss) from discontinued operations attributable to AIR per common share	0	0	0.09
Income (loss) from continuing operations attributable to AIR per common share/unit	5.81	2.89	(0.94)
Income from discontinued operations attributable to AIR per common share/unit	903,642	447,124	115,961
Earnings per share - basic	5.86	2.90	(0.85)
Earnings per share - diluted	$ 5.81	$ 2.89	$ (0.85)
Apartment Income REIT, L.P [Member]
Diluted Earnings per Share:
Income from discontinued operations attributable to AIR common stockholders	$ 0	$ 0	$ 11,632
Basic net income (loss) attributable to AIR	962,414	475,557	(109,767)
Effect of dilutive instruments	6,388	0	0
Dilutive net income (loss) attributable to the AIR Operating Partnership's common unitholders	$ 968,802	$ 475,557	$ (109,767)
Basic weighted-average common shares/unit outstanding	164,141	162,739	128,775
Dilutive common share/unit equivalents outstanding	2,494	369	0
Dilutive common share equivalents outstanding	166,635	163,108	128,775
Income (loss) from continuing operations attributable to AIR per common share	$ 5.86	$ 2.92	$ (0.94)
Income (loss) from discontinued operations attributable to AIR per common share	0	0	0.09
Income (loss) from continuing operations attributable to AIR per common share/unit	5.81	2.92	(0.94)
Income from discontinued operations attributable to AIR per common share/unit	962,414	475,557	(121,399)
Earnings per share - basic	5.86	2.92	(0.85)
Earnings per share - diluted	5.81	2.92	(0.85)
Common Stock
Schedule of Earnings Per Share and Per Unit [Line Items]
Dividends declared per common share (in dollars per share)	$ 1.80	$ 1.74	$ 1.64