Equity Residential (EQR) 10-Q 28 Oct 22 2022 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2022	Oct. 21, 2022
Document Information [Line Items]
Entity Registrant Name	EQUITY RESIDENTIAL
Entity Central Index Key	0000906107
Document Type	10-Q
Document Period End Date	Sep. 30, 2022
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Trading Symbol	EQR
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		377,918,920
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	1-12252
Entity Tax Identification Number	13-3675988
Entity Address, Address Line One	Two North Riverside Plaza
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60606
City Area Code	312
Local Phone Number	474-1300
Entity Incorporation, State or Country Code	MD
Title of 12(b) Security	Common Shares of Beneficial Interest,$0.01 Par Value (Equity Residential)
Security Exchange Name	NYSE
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
ERPOP [Member]
Document Information [Line Items]
Entity Registrant Name	ERP OPERATING LIMITED PARTNERSHIP
Entity Central Index Key	0000931182
Document Type	10-Q
Document Period End Date	Sep. 30, 2022
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
No Trading Symbol Flag	true
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	0-24920
Entity Tax Identification Number	36-3894853
Entity Address, Address Line One	Two North Riverside Plaza
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60606
City Area Code	312
Local Phone Number	474-1300
Entity Incorporation, State or Country Code	IL
Title of 12(b) Security	7.57% Notes due August 15, 2026(ERP Operating Limited Partnership)
Security Exchange Name	NYSE
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes

CONSOLIDATED BALANCE SHEETS (Un

CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
ASSETS
Land	$ 5,580,878	$ 5,814,790
Depreciable property	22,251,673	22,370,811
Projects under development	89,347	24,307
Land held for development	60,165	62,998
Investment in real estate	27,982,063	28,272,906
Accumulated depreciation	(8,813,578)	(8,354,282)
Investment in real estate, net	19,168,485	19,918,624
Investments in unconsolidated entities	256,311	127,448
Cash and cash equivalents	44,788	123,832
Restricted deposits	76,679	236,404
Right-of-use assets	465,814	474,713
Other assets	253,328	288,220
Total assets	20,265,405	21,169,241
Liabilities:
Mortgage notes payable, net	1,967,827	2,191,201
Notes, net	5,340,807	5,835,222
Line of credit and commercial paper	189,557	315,030
Accounts payable and accrued expenses	175,843	107,013
Accrued interest payable	49,652	69,510
Lease liabilities	309,548	312,335
Other liabilities	287,955	353,102
Security deposits	69,247	66,141
Distributions payable	242,695	233,502
Total liabilities	8,633,131	9,483,056
Commitments and contingencies
Redeemable Noncontrolling Interests – Operating Partnership	370,537	498,977
Shareholders' equity:
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized; 745,600 shares issued and outstanding as of September 30, 2022 and December 31, 2021	37,280	37,280
Common Shares of beneficial interest, $0.01 par value; 1,000,000,000 shares authorized; 376,169,253 shares issued and outstanding as of September 30, 2022 and 375,527,195 shares issued and outstanding as of December 31, 2021	3,762	3,755
Paid in capital	9,267,450	9,121,122
Retained earnings	1,737,107	1,827,063
Accumulated other comprehensive income (loss)	(872)	(34,272)
Total shareholders’ equity	11,044,727	10,954,948
Noncontrolling Interests:
Operating Partnership	218,577	214,094
Partially Owned Properties	(1,567)	18,166
Total Noncontrolling Interests	217,010	232,260
Total equity	11,261,737	11,187,208
Total liabilities and equity	$ 20,265,405	$ 21,169,241

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - $ / shares	Sep. 30, 2022	Dec. 31, 2021
Statement Of Financial Position [Abstract]
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	100,000,000	100,000,000
Preferred Stock, Shares Issued	745,600	745,600
Preferred Stock, Shares Outstanding	745,600	745,600
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	1,000,000,000	1,000,000,000
Common Stock, Shares, Issued	376,169,253	375,527,195
Common Stock, Shares, Outstanding	376,169,253	375,527,195

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
REVENUES
Rental income	$ 695,099	$ 623,206	$ 2,035,477	$ 1,818,867
EXPENSES
Property and maintenance	124,048	116,461	365,277	341,261
Real estate taxes and insurance	100,361	96,909	302,899	297,780
Property management	25,729	23,772	83,035	74,357
General and administrative	13,372	13,041	47,033	43,102
Depreciation	214,129	215,397	667,896	616,032
Total expenses	477,639	465,580	1,466,140	1,372,532
Net gain (loss) on sales of real estate properties	196,551	363,928	304,346	587,623
Operating income	414,011	521,554	873,683	1,033,958
Interest and other income	720	973	4,844	25,293
Other expenses	(3,755)	(3,456)	(9,191)	(10,908)
Interest:
Expense incurred, net	(72,412)	(68,251)	(217,093)	(202,733)
Amortization of deferred financing costs	(2,220)	(2,048)	(6,421)	(6,172)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	336,344	448,772	645,822	839,438
Income and other tax (expense) benefit	(152)	(284)	(725)	(679)
Income (loss) from investments in unconsolidated entities	(1,027)	(1,156)	(3,456)	(3,028)
Net gain (loss) on sales of land parcels				5
Net income	335,165	447,332	641,641	835,736
Net (income) loss attributable to Noncontrolling Interests:
Operating Partnership	(10,997)	(14,847)	(21,024)	(27,903)
Partially Owned Properties	(1,143)	(534)	(2,726)	(1,957)
Net income attributable to controlling interests	323,025	431,951	617,891	805,876
Preferred distributions	(773)	(773)	(2,318)	(2,318)
Net income available to Common Shares	$ 322,252	$ 431,178	$ 615,573	$ 803,558
Earnings per share – basic:
Net income available to Common Shares	$ 0.86	$ 1.15	$ 1.64	$ 2.15
Weighted average Common Shares outstanding	375,850	374,308	375,710	373,474
Earnings per share – diluted:
Net income available to Common Shares	$ 0.86	$ 1.15	$ 1.63	$ 2.14
Weighted average Common Shares outstanding	389,300	388,374	389,394	387,642

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Comprehensive income:
Net income	$ 335,165	$ 447,332	$ 641,641	$ 835,736
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period	24,672		23,413
Losses reclassified into earnings from other comprehensive income	5,106	2,363	9,987	7,000
Other comprehensive income (loss)	29,778	2,363	33,400	7,000
Comprehensive income	364,943	449,695	675,041	842,736
Comprehensive (income) attributable to Noncontrolling Interests	(13,123)	(15,459)	(24,853)	(30,100)
Comprehensive income attributable to controlling interests	$ 351,820	$ 434,236	$ 650,188	$ 812,636

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 641,641	$ 835,736
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	667,896	616,032
Amortization of deferred financing costs	6,421	6,172
Amortization of above/below market lease intangibles		(154)
Amortization of discounts and premiums on debt	4,123	3,934
Amortization of deferred settlements on derivative instruments	9,978	6,991
Amortization of right-of-use assets	9,123	10,286
Write-off of pursuit costs	3,296	3,557
(Income) loss from investments in unconsolidated entities	3,456	3,028
Distributions from unconsolidated entities – return on capital	251
Net (gain) loss on sales of real estate properties	(304,346)	(587,623)
Net (gain) loss on sales of land parcels		(5)
Realized (gain) loss on sale of investment securities	(2,061)	(23,432)
Compensation paid with Company Common Shares	24,559	21,919
Changes in assets and liabilities:
(Increase) decrease in other assets	20,734	16,269
Increase (decrease) in accounts payable and accrued expenses	76,274	69,170
Increase (decrease) in accrued interest payable	(19,858)	(9,119)
Increase (decrease) in lease liabilities	(1,166)	(4,112)
Increase (decrease) in other liabilities	(23,199)	5,427
Increase (decrease) in security deposits	3,106	4,137
Net cash provided by operating activities	1,120,228	978,213
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(113,046)	(1,022,275)
Investment in real estate – development/other	(81,889)	(172,850)
Capital expenditures to real estate	(141,707)	(107,706)
Non-real estate capital additions	(2,232)	(1,251)
Interest capitalized for real estate and unconsolidated entities under development	(4,181)	(12,365)
Proceeds from disposition of real estate, net	720,302	1,014,328
Investments in unconsolidated entities - acquisitions	(49,330)	(21,787)
Investments in unconsolidated entities – development/other	(87,129)	(9,294)
Distributions from unconsolidated entities – return of capital	9	4
Purchase of investment securities and other investments	(1,045)	(167,791)
Proceeds from sale of investment securities	3,584	191,398
Net cash provided by (used for) investing activities	243,336	(309,589)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(373)	(6,447)
Mortgage notes payable, net:
Proceeds	37,429	51,298
Lump sum payoffs	(260,874)	(59,880)
Scheduled principal repayments	(3,186)	(5,570)
Notes, net:
Proceeds		497,470
Lump sum payoffs	(500,000)
Line of credit and commercial paper:
Commercial paper proceeds	5,140,685	4,305,170
Commercial paper repayments	(5,266,158)	(4,690,000)
Finance ground lease principal payments	(1,845)	(349)
Proceeds from Employee Share Purchase Plan (ESPP)	3,280	3,455
Proceeds from exercise of options	21,021	68,807
Payment of offering costs	(739)	(267)
Other financing activities, net	(31)	(31)
Acquisition of Noncontrolling Interests – Partially Owned Properties	(32,178)
Contributions – Noncontrolling Interests – Partially Owned Properties	603
Contributions – Noncontrolling Interests – Operating Partnership	1
Distributions:
Common Shares	(696,679)	(674,531)
Preferred Shares	(2,318)	(2,318)
Noncontrolling Interests – Operating Partnership	(22,735)	(23,949)
Noncontrolling Interests – Partially Owned Properties	(18,236)	(4,461)
Net cash provided by (used for) financing activities	(1,602,333)	(541,603)
Net increase (decrease) in cash and cash equivalents and restricted deposits	(238,769)	127,021
Cash and cash equivalents and restricted deposits, beginning of period	360,236	99,728
Cash and cash equivalents and restricted deposits, end of period	121,467	226,749
Cash and cash equivalents	44,788	39,707
Restricted deposits	76,679	187,042
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	221,218	199,799
Net cash paid (received) for income and other taxes	728	1,040
Amortization of deferred financing costs:
Investment in real estate, net	(380)	(227)
Other assets	1,754	1,754
Mortgage notes payable, net	1,620	1,702
Notes, net	3,427	2,943
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	1,865	2,069
Notes, net	2,258	1,865
Amortization of deferred settlements on derivative instruments:
Other liabilities	(9)	(9)
Accumulated other comprehensive income	9,987	7,000
Write-off of pursuit costs:
Investment in real estate, net	948	3,000
Investments in unconsolidated entities	2,197
Other assets	151	533
Accounts payable and accrued expenses		24
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	2,517	2,062
Other liabilities	939	966
Realized/unrealized (gain) loss on derivative instruments:
Other assets	(23,413)
Accumulated other comprehensive income	23,413
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	(1,312)	(12,260)
Investments in unconsolidated entities	(2,869)	(105)
Investments in unconsolidated entities - development/other:
Investment in real estate, net		967
Investments in unconsolidated entities	(85,839)	(8,251)
Other liabilities	(1,290)	(2,010)
Debt financing costs:
Other assets	(45)	228
Mortgage notes payable, net	(228)	(2,344)
Notes, net	(100)	(4,331)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets	(224)	11,308
Lease liabilities	224	(11,308)
Non-cash share distribution and other transfers from unconsolidated entities:
Investments in unconsolidated entities	4,201	1,430
Other assets	$ (4,201)	$ (1,430)

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Thousands	Total	PREFERRED SHARES	COMMON SHARES, $0.01 PAR VALUE	PAID IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	DISTRIBUTIONS	OPERATING PARTNERSHIP	PARTIALLY OWNED PROPERTIES
Balance, beginning of year at Dec. 31, 2020		$ 37,280	$ 3,723	$ 9,128,599	$ 1,399,715	$ (43,666)
Balance, beginning of year at Dec. 31, 2020								$ 233,162	$ 4,673
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares			11	68,246
Exercise of share options			14	68,793
Employee Share Purchase Plan (ESPP)			1	3,454
Share-based employee compensation expense:
Issuance of restricted units/shares			1	6,571
Share options				2,541
ESPP discount				798
Offering costs				(267)
Supplemental Executive Retirement Plan (SERP)				1,335
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership	$ 119,237			(119,237)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				(27,085)				27,085
PAID IN CAPITAL
Conversion of OP Units into Common Shares			11	68,246
Exercise of share options			14	68,793
Employee Share Purchase Plan (ESPP)			1	3,454
RETAINED EARNINGS
Net income attributable to controlling interests	805,876				805,876
Common Share distributions					(676,158)
Preferred Share distributions					(2,318)
Accumulated other comprehensive income (loss) - derivative instruments:
Losses reclassified into earnings from other comprehensive income	(7,000)					7,000
DISTRIBUTIONS
Distributions declared per Common Share outstanding							$ 1.8075
NONCONTROLLING INTERESTS
Issuance of restricted units/shares			1	6,571
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(68,257)
Equity compensation associated with Noncontrolling Interests								14,173
Net income attributable to Noncontrolling Interests	27,903							27,903	1,957
Distributions to Noncontrolling Interests								(23,366)	(4,492)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	(1,745)							(1,745)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				(27,085)				27,085
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	27,903							27,903	1,957
Distributions to Noncontrolling Interests								(23,366)	(4,492)
Balance, end of period at Sep. 30, 2021		37,280	3,750	9,131,078	1,527,115	(36,666)
Balance, end of period at Sep. 30, 2021								208,955	2,138
Balance, beginning of year at Jun. 30, 2021		37,280	3,744	9,110,121	1,321,875	(39,029)
Balance, beginning of year at Jun. 30, 2021								205,691	2,365
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares				1,597
Exercise of share options			6	29,178
Employee Share Purchase Plan (ESPP)				788
Share-based employee compensation expense:
Issuance of restricted units/shares				1,758
Share options				565
ESPP discount				165
Offering costs				(267)
Supplemental Executive Retirement Plan (SERP)				722
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership				(17,271)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				3,722				(3,722)
PAID IN CAPITAL
Conversion of OP Units into Common Shares				1,597
Exercise of share options			6	29,178
Employee Share Purchase Plan (ESPP)				788
RETAINED EARNINGS
Net income attributable to controlling interests	431,951				431,951
Common Share distributions					(225,938)
Preferred Share distributions					(773)
Accumulated other comprehensive income (loss) - derivative instruments:
Losses reclassified into earnings from other comprehensive income	(2,363)					2,363
DISTRIBUTIONS
Distributions declared per Common Share outstanding							0.6025
NONCONTROLLING INTERESTS
Issuance of restricted units/shares				1,758
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(1,597)
Equity compensation associated with Noncontrolling Interests								3,642
Net income attributable to Noncontrolling Interests	14,847							14,847	534
Distributions to Noncontrolling Interests								(7,367)	(761)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership								(2,539)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				3,722				(3,722)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	14,847							14,847	534
Distributions to Noncontrolling Interests								(7,367)	(761)
Balance, end of period at Sep. 30, 2021		37,280	3,750	9,131,078	1,527,115	(36,666)
Balance, end of period at Sep. 30, 2021								208,955	2,138
Balance, beginning of year at Dec. 31, 2021	10,954,948	37,280	3,755	9,121,122	1,827,063	(34,272)
Balance, beginning of year at Dec. 31, 2021	232,260							214,094	18,166
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares				1,680
Exercise of share options			4	21,017
Employee Share Purchase Plan (ESPP)			1	3,279
Share-based employee compensation expense:
Issuance of restricted units/shares			2	9,524				1
Share options				1,856
ESPP discount				637
Offering costs				(739)
Supplemental Executive Retirement Plan (SERP)				269
Acquisition of Noncontrolling Interests – Partially Owned Properties				(27,383)					(4,795)
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership	(127,570)			127,570
Adjustment for Noncontrolling Interests ownership in Operating Partnership				9,156				(9,156)
PAID IN CAPITAL
Conversion of OP Units into Common Shares				1,680
Exercise of share options			4	21,017
Employee Share Purchase Plan (ESPP)			1	3,279
RETAINED EARNINGS
Net income attributable to controlling interests	617,891				617,891
Common Share distributions					(705,529)
Preferred Share distributions					(2,318)
Accumulated other comprehensive income (loss) - derivative instruments:
Unrealized holding gains (losses) arising during the period	23,413					23,413
Losses reclassified into earnings from other comprehensive income	(9,987)					9,987
DISTRIBUTIONS
Distributions declared per Common Share outstanding							1.875
NONCONTROLLING INTERESTS
Issuance of restricted units/shares			2	9,524				1
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(1,680)
Equity compensation associated with Noncontrolling Interests								16,502
Net income attributable to Noncontrolling Interests	21,024							21,024	2,726
Distributions to Noncontrolling Interests								(23,078)	(18,267)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	(870)							870
Adjustment for Noncontrolling Interests ownership in Operating Partnership				9,156				(9,156)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	21,024							21,024	2,726
Contributions by Noncontrolling Interests									603
Distributions to Noncontrolling Interests								(23,078)	(18,267)
Acquisition of Noncontrolling Interests – Partially Owned Properties				(27,383)					(4,795)
Balance, end of period at Sep. 30, 2022	11,044,727	37,280	3,762	9,267,450	1,737,107	(872)
Balance, end of period at Sep. 30, 2022	217,010							218,577	(1,567)
Balance, beginning of year at Jun. 30, 2022		37,280	3,761	9,229,738	1,649,960	(30,650)
Balance, beginning of year at Jun. 30, 2022								216,326	(1,734)
COMMON SHARES, $0.01 PAR VALUE
Conversion of OP Units into Common Shares				196
Exercise of share options				2,093
Employee Share Purchase Plan (ESPP)			1	901
Share-based employee compensation expense:
Issuance of restricted units/shares				2,165
Share options				466
ESPP discount				217
Offering costs				(252)
Acquisition of Noncontrolling Interests – Partially Owned Properties				(28)					28
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership				29,430
Adjustment for Noncontrolling Interests ownership in Operating Partnership				2,524				(2,524)
PAID IN CAPITAL
Conversion of OP Units into Common Shares				196
Exercise of share options				2,093
Employee Share Purchase Plan (ESPP)			1	901
RETAINED EARNINGS
Net income attributable to controlling interests	323,025				323,025
Common Share distributions					(235,105)
Preferred Share distributions					(773)
Accumulated other comprehensive income (loss) - derivative instruments:
Unrealized holding gains (losses) arising during the period	24,672
Losses reclassified into earnings from other comprehensive income	(5,106)					5,106
DISTRIBUTIONS
Distributions declared per Common Share outstanding							$ 0.625
NONCONTROLLING INTERESTS
Issuance of restricted units/shares				2,165
Conversion of OP Units held by Noncontrolling Interests into OP Units held by General Partner								(196)
Equity compensation associated with Noncontrolling Interests								3,343
Net income attributable to Noncontrolling Interests	10,997							10,997	1,143
Distributions to Noncontrolling Interests								(7,590)	(1,004)
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership								(1,779)
Adjustment for Noncontrolling Interests ownership in Operating Partnership				2,524				(2,524)
PARTIALLY OWNED PROPERTIES
Net income attributable to Noncontrolling Interests	10,997							10,997	1,143
Distributions to Noncontrolling Interests								(7,590)	(1,004)
Acquisition of Noncontrolling Interests – Partially Owned Properties				(28)					28
Balance, end of period at Sep. 30, 2022	11,044,727	$ 37,280	$ 3,762	$ 9,267,450	$ 1,737,107	$ (872)
Balance, end of period at Sep. 30, 2022	$ 217,010							$ 218,577	$ (1,567)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Statement Of Stockholders Equity [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01	$ 0.01

CONSOLIDATED BALANCE SHEETS OF

CONSOLIDATED BALANCE SHEETS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
ASSETS
Land	$ 5,580,878	$ 5,814,790
Depreciable property	22,251,673	22,370,811
Projects under development	89,347	24,307
Land held for development	60,165	62,998
Investment in real estate	27,982,063	28,272,906
Accumulated depreciation	(8,813,578)	(8,354,282)
Investment in real estate, net	19,168,485	19,918,624
Investments in unconsolidated entities	256,311	127,448
Cash and cash equivalents	44,788	123,832
Restricted deposits	76,679	236,404
Right-of-use assets	465,814	474,713
Other assets	253,328	288,220
Total assets	20,265,405	21,169,241
Liabilities:
Mortgage notes payable, net	1,967,827	2,191,201
Notes, net	5,340,807	5,835,222
Line of credit and commercial paper	189,557	315,030
Accounts payable and accrued expenses	175,843	107,013
Accrued interest payable	49,652	69,510
Lease liabilities	309,548	312,335
Other liabilities	287,955	353,102
Security deposits	69,247	66,141
Distributions payable	242,695	233,502
Total liabilities	8,633,131	9,483,056
Commitments and contingencies
Redeemable Limited Partners	370,537	498,977
Partners’ Capital:
Accumulated other comprehensive income (loss)	(872)	(34,272)
Noncontrolling Interests – Partially Owned Properties	(1,567)	18,166
Total liabilities and equity	20,265,405	21,169,241
ERPOP [Member]
ASSETS
Land	5,580,878	5,814,790
Depreciable property	22,251,673	22,370,811
Projects under development	89,347	24,307
Land held for development	60,165	62,998
Investment in real estate	27,982,063	28,272,906
Accumulated depreciation	(8,813,578)	(8,354,282)
Investment in real estate, net	19,168,485	19,918,624
Investments in unconsolidated entities	256,311	127,448
Cash and cash equivalents	44,788	123,832
Restricted deposits	76,679	236,404
Right-of-use assets	465,814	474,713
Other assets	253,328	288,220
Total assets	20,265,405	21,169,241
Liabilities:
Mortgage notes payable, net	1,967,827	2,191,201
Notes, net	5,340,807	5,835,222
Line of credit and commercial paper	189,557	315,030
Accounts payable and accrued expenses	175,843	107,013
Accrued interest payable	49,652	69,510
Lease liabilities	309,548	312,335
Other liabilities	287,955	353,102
Security deposits	69,247	66,141
Distributions payable	242,695	233,502
Total liabilities	8,633,131	9,483,056
Commitments and contingencies
Redeemable Limited Partners	370,537	498,977
Partners’ Capital:
Preference Units	37,280	37,280
General Partner	11,008,319	10,951,940
Limited Partners	218,577	214,094
Accumulated other comprehensive income (loss)	(872)	(34,272)
Total partners’ capital	11,263,304	11,169,042
Noncontrolling Interests – Partially Owned Properties	(1,567)	18,166
Total capital	11,261,737	11,187,208
Total liabilities and equity	$ 20,265,405	$ 21,169,241

CONSOLIDATED STATEMENTS OF OP_2

CONSOLIDATED STATEMENTS OF OPERATIONS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
REVENUES
Rental income	$ 695,099	$ 623,206	$ 2,035,477	$ 1,818,867
EXPENSES
Property and maintenance	124,048	116,461	365,277	341,261
Real estate taxes and insurance	100,361	96,909	302,899	297,780
Property management	25,729	23,772	83,035	74,357
General and administrative	13,372	13,041	47,033	43,102
Depreciation	214,129	215,397	667,896	616,032
Total expenses	477,639	465,580	1,466,140	1,372,532
Net gain (loss) on sales of real estate properties	196,551	363,928	304,346	587,623
Operating income	414,011	521,554	873,683	1,033,958
Interest and other income	720	973	4,844	25,293
Other expenses	(3,755)	(3,456)	(9,191)	(10,908)
Interest:
Expense incurred, net	(72,412)	(68,251)	(217,093)	(202,733)
Amortization of deferred financing costs	(2,220)	(2,048)	(6,421)	(6,172)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	336,344	448,772	645,822	839,438
Income and other tax (expense) benefit	(152)	(284)	(725)	(679)
Income (loss) from investments in unconsolidated entities	(1,027)	(1,156)	(3,456)	(3,028)
Net gain (loss) on sales of land parcels				5
Net income	335,165	447,332	641,641	835,736
Partially Owned Properties	(1,143)	(534)	(2,726)	(1,957)
Net income attributable to controlling interests	$ 323,025	$ 431,951	$ 617,891	$ 805,876
Earnings per Unit – basic:
Net income available to Units	$ 0.86	$ 1.15	$ 1.64	$ 2.15
Earnings per Unit – diluted:
Net income available to Units	$ 0.86	$ 1.15	$ 1.63	$ 2.14
Weighted average Units outstanding	389,300	388,374	389,394	387,642
ERPOP [Member]
REVENUES
Rental income	$ 695,099	$ 623,206	$ 2,035,477	$ 1,818,867
EXPENSES
Property and maintenance	124,048	116,461	365,277	341,261
Real estate taxes and insurance	100,361	96,909	302,899	297,780
Property management	25,729	23,772	83,035	74,357
General and administrative	13,372	13,041	47,033	43,102
Depreciation	214,129	215,397	667,896	616,032
Total expenses	477,639	465,580	1,466,140	1,372,532
Net gain (loss) on sales of real estate properties	196,551	363,928	304,346	587,623
Operating income	414,011	521,554	873,683	1,033,958
Interest and other income	720	973	4,844	25,293
Other expenses	(3,755)	(3,456)	(9,191)	(10,908)
Interest:
Expense incurred, net	(72,412)	(68,251)	(217,093)	(202,733)
Amortization of deferred financing costs	(2,220)	(2,048)	(6,421)	(6,172)
Income before income and other taxes, income (loss) from investments in unconsolidated entities and net gain (loss) on sales of land parcels	336,344	448,772	645,822	839,438
Income and other tax (expense) benefit	(152)	(284)	(725)	(679)
Income (loss) from investments in unconsolidated entities	(1,027)	(1,156)	(3,456)	(3,028)
Net gain (loss) on sales of land parcels				5
Net income	335,165	447,332	641,641	835,736
Partially Owned Properties	(1,143)	(534)	(2,726)	(1,957)
Net income attributable to controlling interests	334,022	446,798	638,915	833,779
ALLOCATION OF NET INCOME:
Preference Units	773	773	2,318	2,318
General Partner	322,252	431,178	615,573	803,558
Limited Partners	10,997	14,847	21,024	27,903
Net income available to Units	$ 333,249	$ 446,025	$ 636,597	$ 831,461
Earnings per Unit – basic:
Net income available to Units	$ 0.86	$ 1.15	$ 1.64	$ 2.15
Weighted average Units outstanding	387,745	386,327	387,603	385,841
Earnings per Unit – diluted:
Net income available to Units	$ 0.86	$ 1.15	$ 1.63	$ 2.14
Weighted average Units outstanding	389,300	388,374	389,394	387,642

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Comprehensive income:
Net income	$ 335,165	$ 447,332	$ 641,641	$ 835,736
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period	24,672		23,413
Losses reclassified into earnings from other comprehensive income	5,106	2,363	9,987	7,000
Other comprehensive income (loss)	29,778	2,363	33,400	7,000
Comprehensive income	364,943	449,695	675,041	842,736
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(13,123)	(15,459)	(24,853)	(30,100)
Comprehensive income attributable to controlling interests	351,820	434,236	650,188	812,636
ERPOP [Member]
Comprehensive income:
Net income	335,165	447,332	641,641	835,736
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the period	24,672		23,413
Losses reclassified into earnings from other comprehensive income	5,106	2,363	9,987	7,000
Other comprehensive income (loss)	29,778	2,363	33,400	7,000
Comprehensive income	364,943	449,695	675,041	842,736
Comprehensive (income) attributable to Noncontrolling Interests – Partially Owned Properties	(1,143)	(534)	(2,726)	(1,957)
Comprehensive income attributable to controlling interests	$ 363,800	$ 449,161	$ 672,315	$ 840,779

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 641,641	$ 835,736
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	667,896	616,032
Amortization of deferred financing costs	6,421	6,172
Amortization of above/below market lease intangibles		(154)
Amortization of discounts and premiums on debt	4,123	3,934
Amortization of deferred settlements on derivative instruments	9,978	6,991
Amortization of right-of-use assets	9,123	10,286
Write-off of pursuit costs	3,296	3,557
(Income) loss from investments in unconsolidated entities	3,456	3,028
Distributions from unconsolidated entities – return on capital	251
Net (gain) loss on sales of real estate properties	(304,346)	(587,623)
Net (gain) loss on sales of land parcels		(5)
Realized (gain) loss on sale of investment securities	(2,061)	(23,432)
Compensation paid with Company Common Shares	24,559	21,919
Changes in assets and liabilities:
(Increase) decrease in other assets	20,734	16,269
Increase (decrease) in accounts payable and accrued expenses	76,274	69,170
Increase (decrease) in accrued interest payable	(19,858)	(9,119)
Increase (decrease) in lease liabilities	(1,166)	(4,112)
Increase (decrease) in other liabilities	(23,199)	5,427
Increase (decrease) in security deposits	3,106	4,137
Net cash provided by operating activities	1,120,228	978,213
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(113,046)	(1,022,275)
Investment in real estate – development/other	(81,889)	(172,850)
Capital expenditures to real estate	(141,707)	(107,706)
Non-real estate capital additions	(2,232)	(1,251)
Interest capitalized for real estate and unconsolidated entities under development	(4,181)	(12,365)
Proceeds from disposition of real estate, net	720,302	1,014,328
Investments in unconsolidated entities - acquisitions	(49,330)	(21,787)
Investments in unconsolidated entities – development/other	(87,129)	(9,294)
Distributions from unconsolidated entities – return of capital	9	4
Purchase of investment securities and other investments	(1,045)	(167,791)
Proceeds from sale of investment securities	3,584	191,398
Net cash provided by (used for) investing activities	243,336	(309,589)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(373)	(6,447)
Mortgage notes payable, net:
Proceeds	37,429	51,298
Lump sum payoffs	(260,874)	(59,880)
Scheduled principal repayments	(3,186)	(5,570)
Notes, net:
Proceeds		497,470
Lump sum payoffs	(500,000)
Line of credit and commercial paper:
Commercial paper proceeds	5,140,685	4,305,170
Commercial paper repayments	(5,266,158)	(4,690,000)
Finance ground lease principal payments	(1,845)	(349)
Proceeds from Employee Share Purchase Plan (ESPP)	3,280	3,455
Proceeds from exercise of EQR options	21,021	68,807
Payment of offering costs	(739)	(267)
Other financing activities, net	(31)	(31)
Acquisition of Noncontrolling Interests – Partially Owned Properties	(32,178)
Contributions – Noncontrolling Interests – Partially Owned Properties	603
Contributions – Limited Partners	1
Distributions:
OP Units – General Partner	(696,679)	(674,531)
Preference Units	(2,318)	(2,318)
OP Units – Limited Partners	(22,735)	(23,949)
Noncontrolling Interests – Partially Owned Properties	(18,236)	(4,461)
Net cash provided by (used for) financing activities	(1,602,333)	(541,603)
Net increase (decrease) in cash and cash equivalents and restricted deposits	(238,769)	127,021
Cash and cash equivalents and restricted deposits, beginning of period	360,236	99,728
Cash and cash equivalents and restricted deposits, end of period	121,467	226,749
Cash and cash equivalents	44,788	39,707
Restricted deposits	76,679	187,042
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	221,218	199,799
Net cash paid (received) for income and other taxes	728	1,040
Amortization of deferred financing costs:
Investment in real estate, net	(380)	(227)
Other assets	1,754	1,754
Mortgage notes payable, net	1,620	1,702
Notes, net	3,427	2,943
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	1,865	2,069
Notes, net	2,258	1,865
Amortization of deferred settlements on derivative instruments:
Other liabilities	(9)	(9)
Accumulated other comprehensive income	9,987	7,000
Write-off of pursuit costs:
Investment in real estate, net	948	3,000
Investments in unconsolidated entities	2,197
Other assets	151	533
Accounts payable and accrued expenses		24
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	2,517	2,062
Other liabilities	939	966
Realized/unrealized (gain) loss on derivative instruments:
Other assets	(23,413)
Accumulated other comprehensive income	23,413
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	(1,312)	(12,260)
Investments in unconsolidated entities	2,869	105
Investments in unconsolidated entities - development/other:
Investment in real estate, net		967
Investments in unconsolidated entities	(85,839)	(8,251)
Other liabilities	(1,290)	(2,010)
Debt financing costs:
Other assets	(45)	228
Mortgage notes payable, net	(228)	(2,344)
Notes, net	(100)	(4,331)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets	(224)	11,308
Lease liabilities	224	(11,308)
Non-cash share distribution and other transfers from unconsolidated entities:
Investments in unconsolidated entities	4,201	1,430
Other assets	(4,201)	(1,430)
ERPOP [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	641,641	835,736
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	667,896	616,032
Amortization of deferred financing costs	6,421	6,172
Amortization of above/below market lease intangibles		(154)
Amortization of discounts and premiums on debt	4,123	3,934
Amortization of deferred settlements on derivative instruments	9,978	6,991
Amortization of right-of-use assets	9,123	10,286
Write-off of pursuit costs	3,296	3,557
(Income) loss from investments in unconsolidated entities	3,456	3,028
Distributions from unconsolidated entities – return on capital	251
Net (gain) loss on sales of real estate properties	(304,346)	(587,623)
Net (gain) loss on sales of land parcels		(5)
Realized (gain) loss on sale of investment securities	(2,061)	(23,432)
Compensation paid with Company Common Shares	24,559	21,919
Changes in assets and liabilities:
(Increase) decrease in other assets	20,734	16,269
Increase (decrease) in accounts payable and accrued expenses	76,274	69,170
Increase (decrease) in accrued interest payable	(19,858)	(9,119)
Increase (decrease) in lease liabilities	(1,166)	(4,112)
Increase (decrease) in other liabilities	(23,199)	5,427
Increase (decrease) in security deposits	3,106	4,137
Net cash provided by operating activities	1,120,228	978,213
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in real estate – acquisitions	(113,046)	(1,022,275)
Investment in real estate – development/other	(81,889)	(172,850)
Capital expenditures to real estate	(141,707)	(107,706)
Non-real estate capital additions	(2,232)	(1,251)
Interest capitalized for real estate and unconsolidated entities under development	(4,181)	(12,365)
Proceeds from disposition of real estate, net	720,302	1,014,328
Investments in unconsolidated entities - acquisitions	(49,330)	(21,787)
Investments in unconsolidated entities – development/other	(87,129)	(9,294)
Distributions from unconsolidated entities – return of capital	9	4
Purchase of investment securities and other investments	(1,045)	(167,791)
Proceeds from sale of investment securities	3,584	191,398
Net cash provided by (used for) investing activities	243,336	(309,589)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt financing costs	(373)	(6,447)
Mortgage notes payable, net:
Proceeds	37,429	51,298
Lump sum payoffs	(260,874)	(59,880)
Scheduled principal repayments	(3,186)	(5,570)
Notes, net:
Proceeds		497,470
Lump sum payoffs	(500,000)
Line of credit and commercial paper:
Commercial paper proceeds	5,140,685	4,305,170
Commercial paper repayments	(5,266,158)	(4,690,000)
Finance ground lease principal payments	(1,845)	(349)
Proceeds from Employee Share Purchase Plan (ESPP)	3,280	3,455
Proceeds from exercise of EQR options	21,021	68,807
Payment of offering costs	(739)	(267)
Other financing activities, net	(31)	(31)
Acquisition of Noncontrolling Interests – Partially Owned Properties	(32,178)
Contributions – Noncontrolling Interests – Partially Owned Properties	603
Contributions – Limited Partners	1
Distributions:
OP Units – General Partner	(696,679)	(674,531)
Preference Units	(2,318)	(2,318)
OP Units – Limited Partners	(22,735)	(23,949)
Noncontrolling Interests – Partially Owned Properties	(18,236)	(4,461)
Net cash provided by (used for) financing activities	(1,602,333)	(541,603)
Net increase (decrease) in cash and cash equivalents and restricted deposits	(238,769)	127,021
Cash and cash equivalents and restricted deposits, beginning of period	360,236	99,728
Cash and cash equivalents and restricted deposits, end of period	121,467	226,749
Cash and cash equivalents	44,788	39,707
Restricted deposits	76,679	187,042
SUPPLEMENTAL INFORMATION:
Cash paid for interest, net of amounts capitalized	221,218	199,799
Net cash paid (received) for income and other taxes	728	1,040
Amortization of deferred financing costs:
Investment in real estate, net	(380)	(227)
Other assets	1,754	1,754
Mortgage notes payable, net	1,620	1,702
Notes, net	3,427	2,943
Amortization of discounts and premiums on debt:
Mortgage notes payable, net	1,865	2,069
Notes, net	2,258	1,865
Amortization of deferred settlements on derivative instruments:
Other liabilities	(9)	(9)
Accumulated other comprehensive income	9,987	7,000
Write-off of pursuit costs:
Investment in real estate, net	948	3,000
Investments in unconsolidated entities	2,197
Other assets	151	533
Accounts payable and accrued expenses		24
(Income) loss from investments in unconsolidated entities:
Investments in unconsolidated entities	2,517	2,062
Other liabilities	939	966
Realized/unrealized (gain) loss on derivative instruments:
Other assets	(23,413)
Accumulated other comprehensive income	23,413
Interest capitalized for real estate and unconsolidated entities under development:
Investment in real estate, net	(1,312)	(12,260)
Investments in unconsolidated entities	(2,869)	(105)
Investments in unconsolidated entities - development/other:
Investment in real estate, net		967
Investments in unconsolidated entities	(85,839)	(8,251)
Other liabilities	(1,290)	(2,010)
Debt financing costs:
Other assets	(45)	228
Mortgage notes payable, net	(228)	(2,344)
Notes, net	(100)	(4,331)
Right-of-use assets and lease liabilities initial measurement and reclassifications:
Right-of-use assets	(224)	11,308
Lease liabilities	224	(11,308)
Non-cash share distribution and other transfers from unconsolidated entities:
Investments in unconsolidated entities	4,201	1,430
Other assets	$ (4,201)	$ (1,430)

CONSOLIDATED STATEMENTS OF CH_3

CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL OF ERP OPERATING LIMITED PARTNERSHIP (Unaudited) - USD ($) $ in Thousands	Total	ERPOP [Member]	PREFERRED SHARES ERPOP [Member]	General Partner [Member] ERPOP [Member]	Limited Partner ERPOP [Member]	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ERPOP [Member]	DISTRIBUTIONS [Member] ERPOP [Member]	PARTIALLY OWNED PROPERTIES [Member] ERPOP [Member]
Balance, beginning of year at Dec. 31, 2020			$ 37,280	$ 10,532,037	$ 233,162	$ (43,666)
Balance, beginning of year at Dec. 31, 2020								$ 4,673
Conversion of OP Units held by Limited Partners into OP Units held by General Partner				68,257	(68,257)
Exercise of EQR share options				68,807
EQR's Employee Share Purchase Plan (ESPP)				3,455
EQR restricted shares				6,572
EQR share options				2,541
EQR ESPP discount				798
Net income available to Units - General Partner		$ 803,558		803,558
OP Units General Partner distributions				(676,158)
Offering costs				(267)
Supplemental Executive Retirement Plan (SERP)				(1,335)
Change in market value of Redeemable Limited Partners				(119,237)
Adjustment for Limited Partners ownership in Operating Partnership				(27,085)	27,085
Equity compensation associated with Units - Limited Partners					14,173
Net income available to Units - Limited Partners		27,903			27,903
Units - Limited Partners distributions					(23,366)
Change in carrying value of Redeemable Limited Partners					(1,745)
Losses reclassified into earnings from other comprehensive income	$ (7,000)	(7,000)				7,000
Distributions declared per Unit outstanding							$ 1.8075
Net income attributable to Noncontrolling Interests	835,736	835,736						1,957
Distributions to Noncontrolling Interests								(4,492)
Balance, end of period at Sep. 30, 2021			37,280	10,661,943	208,955	(36,666)
Balance, end of period at Sep. 30, 2021								2,138
Balance, beginning of year at Jun. 30, 2021			37,280	10,435,740	205,691	(39,029)
Balance, beginning of year at Jun. 30, 2021								2,365
Conversion of OP Units held by Limited Partners into OP Units held by General Partner				1,597	(1,597)
Exercise of EQR share options				29,184
EQR's Employee Share Purchase Plan (ESPP)				788
EQR restricted shares				1,758
EQR share options				565
EQR ESPP discount				165
Net income available to Units - General Partner		431,178		431,178
OP Units General Partner distributions				(225,938)
Offering costs				(267)
Supplemental Executive Retirement Plan (SERP)				722
Change in market value of Redeemable Limited Partners				(17,271)
Adjustment for Limited Partners ownership in Operating Partnership				3,722	(3,722)
Equity compensation associated with Units - Limited Partners					3,642
Net income available to Units - Limited Partners		14,847			14,847
Units - Limited Partners distributions					(7,367)
Change in carrying value of Redeemable Limited Partners					(2,539)
Losses reclassified into earnings from other comprehensive income	(2,363)	(2,363)				2,363
Distributions declared per Unit outstanding							0.6025
Net income attributable to Noncontrolling Interests	447,332	447,332						534
Distributions to Noncontrolling Interests								(761)
Balance, end of period at Sep. 30, 2021			37,280	10,661,943	208,955	(36,666)
Balance, end of period at Sep. 30, 2021								2,138
Balance, beginning of year at Dec. 31, 2021			37,280	10,951,940	214,094	(34,272)
Balance, beginning of year at Dec. 31, 2021								18,166
Conversion of OP Units held by Limited Partners into OP Units held by General Partner				1,680	(1,680)
Exercise of EQR share options				21,021
EQR's Employee Share Purchase Plan (ESPP)				3,280
EQR restricted shares				9,526	1
EQR share options				1,856
EQR ESPP discount				637
Net income available to Units - General Partner		615,573		615,573
OP Units General Partner distributions				(705,529)
Offering costs				(739)
Supplemental Executive Retirement Plan (SERP)				(269)
Acquisition of Noncontrolling Interests – Partially Owned Properties				(27,383)				(4,795)
Change in market value of Redeemable Limited Partners				127,570
Adjustment for Limited Partners ownership in Operating Partnership				9,156	(9,156)
Equity compensation associated with Units - Limited Partners					16,502
Net income available to Units - Limited Partners		21,024			21,024
Units - Limited Partners distributions					(23,078)
Change in carrying value of Redeemable Limited Partners					870
Unrealized holding gains (losses) arising during the period	23,413	23,413				23,413
Losses reclassified into earnings from other comprehensive income	(9,987)	(9,987)				9,987
Distributions declared per Unit outstanding							1.875
Net income attributable to Noncontrolling Interests	641,641	641,641						2,726
Contributions by Noncontrolling Interests								603
Distributions to Noncontrolling Interests								(18,267)
Balance, end of period at Sep. 30, 2022			37,280	11,008,319	218,577	(872)
Balance, end of period at Sep. 30, 2022								(1,567)
Balance, beginning of year at Jun. 30, 2022			37,280	10,883,459	216,326	(30,650)
Balance, beginning of year at Jun. 30, 2022								(1,734)
Conversion of OP Units held by Limited Partners into OP Units held by General Partner				196	(196)
Exercise of EQR share options				2,093
EQR's Employee Share Purchase Plan (ESPP)				902
EQR restricted shares				2,165
EQR share options				466
EQR ESPP discount				217
Net income available to Units - General Partner		322,252		322,252
OP Units General Partner distributions				(235,105)
Offering costs				(252)
Acquisition of Noncontrolling Interests – Partially Owned Properties				(28)				28
Change in market value of Redeemable Limited Partners				29,430
Adjustment for Limited Partners ownership in Operating Partnership				2,524	(2,524)
Equity compensation associated with Units - Limited Partners					3,343
Net income available to Units - Limited Partners		10,997			10,997
Units - Limited Partners distributions					(7,590)
Change in carrying value of Redeemable Limited Partners					(1,779)
Unrealized holding gains (losses) arising during the period	24,672	24,672				24,672
Losses reclassified into earnings from other comprehensive income	(5,106)	(5,106)				5,106
Distributions declared per Unit outstanding							$ 0.625
Net income attributable to Noncontrolling Interests	$ 335,165	$ 335,165						1,143
Distributions to Noncontrolling Interests								(1,004)
Balance, end of period at Sep. 30, 2022			$ 37,280	$ 11,008,319	$ 218,577	$ (872)
Balance, end of period at Sep. 30, 2022								$ (1,567)

Business

Business	9 Months Ended
	Sep. 30, 2022
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Business	1. Business Equity Residential (“EQR”) is an S&P 500 company focused on the acquisition, development and management of residential properties located in and around dynamic cities that attract affluent long-term renters, a business that is conducted on its behalf by ERP Operating Limited Partnership (“ERPOP”). EQR is a Maryland real estate investment trust (“REIT”) formed in March 1993 and ERPOP is an Illinois limited partnership formed in May 1993. References to the “Company,” “we,” “us” or “our” mean collectively EQR, ERPOP and those entities/subsidiaries owned or controlled by EQR and/or ERPOP. References to the “Operating Partnership” mean collectively ERPOP and those entities/subsidiaries owned or controlled by ERPOP. Unless otherwise indicated, the notes to consolidated financial statements apply to both the Company and the Operating Partnership. EQR is the general partner of, and as of September 30, 2022 owned an approximate 96.7 % ownership interest in, ERPOP. All of the Company’s property ownership, development and related business operations are conducted through the Operating Partnership and EQR has no material assets or liabilities other than its investment in ERPOP. EQR issues equity from time to time, the net proceeds of which it is obligated to contribute to ERPOP, but does not have any indebtedness as all debt is incurred by the Operating Partnership. The Operating Partnership holds substantially all of the assets of the Company, including the Company’s ownership interests in its joint ventures. The Operating Partnership conducts the operations of the business and is structured as a partnership with no publicly traded equity. As of September 30, 2022, the Company, directly or indirectly through investments in title holding entities, owned all or a portion of 308 properties located in 10 states and the District of Columbia consisting of 79,594 apartment units. The ownership breakdown includes (table does not include any uncompleted development properties): Properties Apartment Units Wholly Owned Properties 293 76,480 Partially Owned Properties – Consolidated 15 3,114 308 79,594

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2022
Summary Of Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States (“GAAP”) for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) and certain reclassifications considered necessary for a fair presentation have been included. Operating results for the nine months ended September 30, 2022 are not necessarily indicative of the results that may be expected for the year ending December 31, 2022. In preparation of the Company’s financial statements in conformity with accounting principles generally accepted in the United States, management makes estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. The balance sheets at December 31, 2021 have been derived from the audited financial statements at that date but do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. For further information, including definitions of capitalized terms not defined herein, refer to the consolidated financial statements and footnotes thereto included in the Company’s and the Operating Partnership’s Annual Report on Form 10-K for the year ended December 31, 2021 . Income and Other Taxes EQR has elected to be taxed as a REIT. This, along with the nature of the operations of its operating properties, resulted in no provision for federal income taxes at the EQR level. In addition, ERPOP generally is not liable for federal income taxes as the partners recognize their allocable share of income or loss in their tax returns; therefore no provision for federal income taxes has been made at the ERPOP level. Historically, the Company has generally only incurred certain state and local income, excise and franchise taxes. The Company has elected taxable REIT subsidiary (“TRS”) status for certain of its corporate subsidiaries and, as a result, these entities will incur both federal and state income taxes on any taxable income of such entities after consideration of any net operating losses. Recent Accounting Pronouncements In August 2020, the Financial Accounting Standards Board (“FASB”) issued an amendment to the debt and equity financial instruments standards which simplifies the accounting for convertible instruments and accounting for contracts in an entity’s own equity. The Company adopted the standard when effective on January 1, 2022 and it had no impact on its consolidated results of operations and financial position. In March 2020, the FASB issued an amendment to the reference rate reform standard which provides the option for a limited period of time to ease the potential burden in accounting for, or recognizing the effects of, reference rate reform on contract modifications and hedge accounting. The new standard was effective for the Company upon issuance and elections can be made through December 31, 2022, subject to a proposed extension to December 31, 2024. The Company elected to apply the hedge accounting expedients and application of these expedients preserves the presentation of derivatives consistent with past presentation. The Company continues to evaluate the impact of the guidance and may apply other elections as applicable as additional changes in the market occur.

Equity, Capital and Other Inter

Equity, Capital and Other Interests	9 Months Ended
	Sep. 30, 2022
Equity Capital And Other Interests [Abstract]
Equity, Capital and Other Interests	3. Equity, Capital and Other Interests The Company refers to “Common Shares” and “Units” (which refer to both OP Units and restricted units) as equity securities for EQR and “General Partner Units” and “Limited Partner Units” as equity securities for ERPOP. To provide a streamlined and more readable presentation of the disclosures for the Company and the Operating Partnership, several sections below refer to the respective terminology for each with the same financial information and separate sections are provided, where needed, to further distinguish any differences in financial information and terminology. The following table presents the changes in the Company’s issued and outstanding Common Shares and Units for the nine months ended September 30, 2022 and 2021: 2022 2021 Common Shares Common Shares outstanding at January 1, 375,527,195 372,302,000 Common Shares Issued: Conversion of OP Units 37,661 1,153,963 Exercise of share options 381,384 1,401,755 Employee Share Purchase Plan (ESPP) 49,662 59,297 Restricted share grants, net 173,351 85,573 Common Shares outstanding at September 30, 376,169,253 375,002,588 Units Units outstanding at January 1, 12,659,027 13,858,073 Restricted unit grants, net 223,242 155,638 Conversion of OP Units to Common Shares ( 37,661 ) ( 1,153,963 ) Units outstanding at September 30, 12,844,608 12,859,748 Total Common Shares and Units outstanding at September 30, 389,013,861 387,862,336 Units Ownership Interest in Operating Partnership 3.3 % 3.3 % The following table presents the changes in the Operating Partnership’s issued and outstanding General Partner Units and Limited Partner Units for the nine months ended September 30, 2022 and 2021: 2022 2021 General and Limited Partner Units General and Limited Partner Units outstanding at January 1, 388,186,222 386,160,073 Issued to General Partner: Exercise of EQR share options 381,384 1,401,755 EQR’s Employee Share Purchase Plan (ESPP) 49,662 59,297 EQR’s restricted share grants, net 173,351 85,573 Issued to Limited Partners: Restricted unit grants, net 223,242 155,638 General and Limited Partner Units outstanding at September 30, 389,013,861 387,862,336 Limited Partner Units Limited Partner Units outstanding at January 1, 12,659,027 13,858,073 Limited Partner restricted unit grants, net 223,242 155,638 Conversion of Limited Partner OP Units to EQR Common Shares ( 37,661 ) ( 1,153,963 ) Limited Partner Units outstanding at September 30, 12,844,608 12,859,748 Limited Partner Units Ownership Interest in Operating Partnership 3.3 % 3.3 % The equity positions of various individuals and entities that contributed their properties to the Operating Partnership in exchange for OP Units, as well as the equity positions of the holders of restricted units, are collectively referred to as the “Noncontrolling Interests – Operating Partnership” and “Limited Partners Capital,” respectively, for the Company and the Operating Partnership. Subject to certain exceptions (including the “book-up” requirements of restricted units), the Noncontrolling Interests – Operating Partnership/Limited Partners Capital may exchange their Units with EQR for Common Shares on a one-for-one basis. The carrying value of the Noncontrolling Interests – Operating Partnership/Limited Partners Capital (including redeemable interests) is allocated based on the number of Noncontrolling Interests – Operating Partnership/Limited Partners Capital in total in proportion to the number of Noncontrolling Interests – Operating Partnership/Limited Partners Capital in total plus the total number of Common Shares/General Partner Units. Net income is allocated to the Noncontrolling Interests – Operating Partnership/Limited Partners Capital based on the weighted average ownership percentage during the period. The Operating Partnership has the right but not the obligation to make a cash payment instead of issuing Common Shares to any and all holders of Noncontrolling Interests – Operating Partnership/Limited Partners Capital requesting an exchange of their Noncontrolling Interests – Operating Partnership/Limited Partners Capital with EQR. Once the Operating Partnership elects not to redeem the Noncontrolling Interests – Operating Partnership/Limited Partners Capital for cash, EQR is obligated to deliver Common Shares to the exchanging holder of the Noncontrolling Interests – Operating Partnership/Limited Partners Capital. The Noncontrolling Interests – Operating Partnership/Limited Partners Capital are classified as either mezzanine equity or permanent equity. If EQR is required, either by contract or securities law, to deliver registered Common Shares, such Noncontrolling Interests – Operating Partnership/Limited Partners Capital are differentiated and referred to as “Redeemable Noncontrolling Interests – Operating Partnership” and “Redeemable Limited Partners,” respectively. Instruments that require settlement in registered shares cannot be classified in permanent equity as it is not always completely within an issuer’s control to deliver registered shares. Therefore, settlement in cash is assumed and that responsibility for settlement in cash is deemed to fall to the Operating Partnership as the primary source of cash for EQR, resulting in presentation in the mezzanine section of the balance sheet. The Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners are adjusted to the greater of carrying value or fair market value based on the Common Share price of EQR at the end of each respective reporting period. EQR has the ability to deliver unregistered Common Shares for the remaining portion of the Noncontrolling Interests – Operating Partnership/Limited Partners Capital that are classified in permanent equity at September 30, 2022 and December 31, 2021. The carrying value of the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners is allocated based on the number of Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners in proportion to the number of Noncontrolling Interests – Operating Partnership/Limited Partners Capital in total. Such percentage of the total carrying value of Units/Limited Partner Units which is ascribed to the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners is then adjusted to the greater of carrying value or fair market value as described above. As of September 30, 2022 and 2021, the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners have a redemption value of approximately $ 370.5 million and $ 459.9 million, respectively, which represents the value of Common Shares that would be issued in exchange for the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners. The following table presents the changes in the redemption value of the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners for the nine months ended September 30, 2022 and 2021, respectively (amounts in thousands): 2022 2021 Balance at January 1, $ 498,977 $ 338,951 Change in market value ( 127,570 ) 119,237 Change in carrying value ( 870 ) 1,745 Balance at September 30, $ 370,537 $ 459,933 Net proceeds from EQR Common Share and Preferred Share (see definition below) offerings and proceeds from exercise of options for Common Shares are contributed by EQR to ERPOP. In return for those contributions, EQR receives a number of OP Units in ERPOP equal to the number of Common Shares it has issued in the equity offering (or in the case of a preferred equity offering, a number of preference units in ERPOP equal in number and having the same terms as the Preferred Shares issued in the equity offering). As a result, the net proceeds from Common Shares and Preferred Shares are allocated for the Company between shareholders’ equity and Noncontrolling Interests – Operating Partnership and for the Operating Partnership between General Partner’s Capital and Limited Partners Capital to account for the change in their respective percentage ownership of the underlying equity. The Company’s declaration of trust authorizes it to issue up to 100,000,000 preferred shares of beneficial interest, $ 0.01 par value per share (the “Preferred Shares”), with specific rights, preferences and other attributes as the Board of Trustees may determine, which may include preferences, powers and rights that are senior to the rights of holders of the Company’s Common Shares. The following table presents the Company’s issued and outstanding Preferred Shares/Preference Units as of September 30, 2022 and December 31, 2021: Amounts in thousands Annual Call Dividend Per September 30, December 31, Date (1) Share/Unit (2) 2022 2021 Preferred Shares/Preference Units of beneficial interest, $ 0.01 par value; 100,000,000 shares authorized: 8.29 % Series K Cumulative Redeemable Preferred Shares/Preference 50 per share/unit; 745,600 shares/units issued 12/10/26 $ 4.145 $ 37,280 $ 37,280 $ 37,280 $ 37,280 (1) On or after the call date, redeemable Preferred Shares/Preference Units may be redeemed for cash at the option of the Company or the Operating Partnership, respectively, in whole or in part, at a redemption price equal to the liquidation price per share/unit, plus accrued and unpaid distributions, if any. (2) Dividends on Preferred Shares/Preference Units are payable quarterly. Other EQR and ERPOP currently have an active universal shelf registration statement for the issuance of equity and debt securities that automatically became effective upon filing with the SEC in May 2022 and expires in May 2025. Per the terms of ERPOP’s partnership agreement, EQR contributes the net proceeds of all equity offerings to the capital of ERPOP in exchange for additional OP Units (on a one-for-one Common Share per OP Unit basis) or preference units (on a one-for-one preferred share per preference unit basis). The Company has an At-The-Market (“ATM”) share offering program which allows EQR to issue Common Shares from time to time into the existing trading market at current market prices or through negotiated transactions, including under forward sale arrangements. In May 2022, the Company replaced the prior program with a new program with the authority to issue up to 13.0 million shares as of September 30, 2022 and which extended the program maturity to May 2025. Forward sale agreements under the ATM program allow the Company, at its election, to settle the agreements by issuing Common Shares in exchange for net proceeds at the then-applicable forward sale price specified by the agreement or, alternatively, to settle the agreements in whole or in part through the delivery or receipt of Common Shares or cash. Issuances of shares under these forward sale agreements are classified as equity transactions. Accordingly, no amounts relating to the forward sale agreements are recorded in the consolidated financial statements until settlement occurs. Prior to any settlements, the only impact to the consolidated financial statements is the inclusion of incremental shares, if any, within the calculation of diluted net income per share using the treasury stock method (see Note 11 for additional discussion). The actual forward price per share to be received by the Company upon settlement will be determined on the applicable settlement date based on adjustments made to the initial forward price to reflect the then-current overnight federal funds rate and the amount of dividends paid to holders of the Company’s Common Shares over the term of the forward sale agreement. As of September 30, 2022, the Company had entered into forward sale agreements under the prior program for a total of approxim ately 1.7 million Common Shares at a weighted average initial forward price per share of $ 83.25 . All of these forward sale agreements were entered into during the quarter ended September 30, 2021. As of September 30, 2022, these forward sale agreements have not been settled and must be settled by March 2023. See Note 14 for additional discussion. The Company may repurchase up to 13.0 million Common Shares under its share repurchase program. No open market repurchases have occurred since 2008, and no repurchases of any kind have occurred since February 2014. As of September 30, 2022 , EQR has remaining authorization to repurchase up to 13.0 million of its shares.

Real Estate

Real Estate	9 Months Ended
	Sep. 30, 2022
Real Estate [Abstract]
Real Estate	4. Real Estate The following table summarizes the carrying amounts for the Company’s investment in real estate (at cost) as of September 30, 2022 and December 31, 2021 (amounts in thousands): September 30, 2022 December 31, 2021 Land $ 5,580,878 $ 5,814,790 Depreciable property: Buildings and improvements 19,445,470 19,632,284 Furniture, fixtures and equipment 2,295,387 2,220,203 In-Place lease intangibles 510,816 518,324 Projects under development: Land 3,201 — Construction-in-progress 86,146 24,307 Land held for development: Land 46,160 46,160 Construction-in-progress 14,005 16,838 Investment in real estate 27,982,063 28,272,906 Accumulated depreciation ( 8,813,578 ) ( 8,354,282 ) Investment in real estate, net $ 19,168,485 $ 19,918,624 During the nine months ended September 30, 2022, the Company acquired the following from unaffiliated parties (purchase price in thousands): Properties Apartment Units Purchase Price Rental Properties – Consolidated (1) 1 172 $ 113,000 Total 1 172 $ 113,000 (1) Purchase price includes an allocation of approximately $ 25.3 million to land and $ 87.7 million to depreciable property (inclusive of capitalized closing costs). During the nine months ended September 30, 2022, the Company disposed of the following to unaffiliated parties (sales price in thousands): Properties Apartment Units Sales Price Rental Properties – Consolidated 3 945 $ 746,150 Total 3 945 $ 746,150 The Company recognized a net gain on sales of real estate properties of approximately $ 304.3 million on the above sales.

Commitments to Acquire_Dispose

Commitments to Acquire/Dispose of Real Estate	9 Months Ended
	Sep. 30, 2022
Commitments To Acquire Dispose Of Real Estate [Abstract]
Commitments to Acquire/Dispose of Real Estate	5. Commitments to Acquire/Dispose of Real Estate The Company has not entered into any agreements to acquire rental properties or land parcels as of the date of filing. The Company has entered into an agreement to dispose of the following (sales price and net book value in thousands): Properties Apartment Units Sales Price Net Book Value at Land Parcels (one) — — $ 5,500 $ 3,930 Total — — $ 5,500 $ 3,930 The closing of pending transactions is subject to certain conditions and restrictions; therefore, there can be no assurance that the transactions will be consummated or that the final terms will not differ in material respects from any agreements summarized above. See Note 14 for discussion of the properties acquired or disposed of, if any, subsequent to September 30, 2022 .

Investments in Partially Owned

Investments in Partially Owned Entities	9 Months Ended
	Sep. 30, 2022
Investments In Partially Owned Entities [Abstract]
Investments in Partially Owned Entities	6. Investments in Partially Owned Entities The Company has invested in various entities with unrelated third parties which are either consolidated or accounted for under the equity method of accounting (unconsolidated). Consolidated Variable Interest Entities (“VIEs”) In accordance with accounting standards for consolidation of VIEs, the Company consolidates ERPOP on EQR’s financial statements. As the sole general partner of ERPOP, EQR has exclusive control of ERPOP’s day-to-day management. The limited partners are not able to exercise substantive kick-out or participating rights. As a result, ERPOP qualifies as a VIE. EQR has a controlling financial interest in ERPOP and, thus, is ERPOP’s primary beneficiary. EQR has the power to direct the activities of ERPOP that most significantly impact ERPOP’s economic performance as well as the obligation to absorb losses or the right to receive benefits from ERPOP that could potentially be significant to ERPOP. The Company has various equity interests in certain joint ventures that have been deemed to be VIEs, and the Company is the VIEs’ primary beneficiary. As a result, the joint ventures are required to be consolidated on the Company’s financial statements. The following table summarizes the Company’s consolidated joint ventures as of September 30, 2022: Operating Properties (1) Project Under Development (2) Properties Apartment Units Project Apartment Units Consolidated Joint Ventures (VIE) 15 3,114 1 312 (1) During the nine months ended September 30, 2022 , the Company acquired its joint venture partner’s 25 % interest in a 432 -unit apartment property for $ 32.2 million, and the property is now wholly owned. In connection with the buyout, the carrying amount of the Noncontrolling Interests – Partially Owned Properties totaling $ 4.8 million was reduced to zero and the remaining $ 27.4 million was recorded to paid in capital/general partner capital. (2) The land under this project is subject to a long-term ground lease. The following table provides consolidated assets and liabilities related to the VIEs discussed above as of September 30, 2022 and December 31, 2021 (amounts in thousands): September 30, 2022 December 31, 2021 Consolidated Assets $ 675,974 $ 912,955 Consolidated Liabilities $ 148,071 $ 251,424 Certain consolidated joint ventures in which we have investments obtained mortgage debt to finance a portion of their activities. The following table and information summarizes the variable rate construction mortgage debt that is non-recourse to the Company at September 30, 2022 (aggregate and amounts borrowed under loan commitments in thousands): Recently Completed Operating Property (1) Project Under Development Number of joint ventures with debt financing 1 1 Aggregate loan commitments $ 67,589 $ 73,344 Amounts borrowed under loan commitments (2) $ 64,816 $ 34,356 Maturity dates 2023 2025 (1) The maturity date of the construction loan was extended to June 25, 2023. (2) See Note 9 for the current period proceeds of secured conventional floating rate debt under Mortgage Notes Payable . Investments in Unconsolidated Entities The Company has various equity interests in certain joint ventures that are unconsolidated and accounted for using the equity method of accounting. Most of these have been deemed to be VIEs and the Company is not the VIEs' primary beneficiary. The remaining have been deemed not to be VIEs and the Company does not have a controlling voting interest. The following table and information summarizes the Company’s investments in unconsolidated entities as of September 30, 2022 and December 31, 2021 (amounts in thousands except for ownership percentage): September 30, 2022 December 31, 2021 Ownership Percentage Investments in Unconsolidated Entities: Various Real Estate Holdings (VIE) $ 36,372 $ 36,024 Varies Projects Under Development and Land Held for Development (VIE) 195,974 72,488 62 % - 95 % (1) Real Estate Technology Funds/Companies (VIE) 24,206 19,347 Varies Other ( 241 ) ( 411 ) Varies Investments in Unconsolidated Entities $ 256,311 $ 127,448 (1) In certain instances, the joint venture agreements contain provisions for promoted interests in favor of our joint venture partner. If the terms of the promoted interest are attained, then our share of the proceeds from a sale or other capital event of the unconsolidated entity may be less than the indicated ownership percentage. The following table summarizes the Company’s unconsolidated joint ventures that were deemed to be VIEs as of September 30, 2022: Real Estate Holdings (1) Projects Under Development (2), (5) Land Held for Development (2), (3) Entities Projects Apartment Units (4) Projects Apartment Units (4) Unconsolidated Joint Ventures (VIE) 2 6 1,982 2 745 (1) Represents entities that hold various real estate investments. (2) Represents separate unconsolidated joint ventures for the purpose of developing multifamily rental properties. (3) Represents separate unconsolidated joint ventures that have not yet started but are expected to start construction in the fourth quarter of 2022 and the second quarter of 2023. (4) Represents the intended number of apartment units to be developed. (5) The land parcel under one of the projects is subject to a long-term ground lease. New Development Joint Ventures The following table provides information on total unconsolidated development joint ventures entered into during the nine months ended September 30, 2022 (amounts in thousands except for number of unconsolidated joint ventures): Number of unconsolidated joint ventures (1) 2 Apartment units (2) 797 Investments in unconsolidated entities – acquisitions $ 49,330 (1) The entities qualify as VIEs, but the Company is not the primary beneficiary because it does not have the power to direct the activities that most significantly impact the VIE’s performance. Therefore, the entities are unconsolidated and recorded using the equity method of accounting. See Note 2 of the Company’s and the Operating Partnership’s Annual Report on Form 10-K for the year ended December 31, 2021 for additional discussion. (2) Represents the intended number of apartment units to be developed.

Restricted Deposits

Restricted Deposits	9 Months Ended
	Sep. 30, 2022
Deposits Restricted [Abstract]
Restricted Deposits	7. Restricted Deposits The following table presents the Company’s restricted deposits as of September 30, 2022 and December 31, 2021 (amounts in thousands): September 30, 2022 December 31, 2021 Mortgage escrow deposits: Replacement reserves $ 12,213 $ 11,156 Mortgage principal reserves/sinking funds 23,484 19,104 Mortgage escrow deposits 35,697 30,260 Restricted cash: Tax-deferred (1031) exchange proceeds — 166,362 Earnest money on pending acquisitions — 2,000 Restricted deposits on real estate investments 235 284 Resident security and utility deposits 38,458 35,663 Other 2,289 1,835 Restricted cash 40,982 206,144 Restricted deposits $ 76,679 $ 236,404

Leases

Leases	9 Months Ended
	Sep. 30, 2022
Leases [Abstract]
Leases	8. Leases Lessor Accounting The Company is the lessor for its residential and non-residential leases and these leases are accounted for as operating leases under the lease standard. The Company generates the majority of its lease revenue from residential apartment leases that are generally twelve months or less in length. The residential apartment leases may include lease income related to such items as utility recoveries, parking rent, storage rent and pet rent that the Company treats as a single lease component because the amenities cannot be leased on their own and the timing and pattern of revenue recognition are the same. The collection of lease payments at lease commencement is probable and therefore the Company subsequently recognizes lease income over the lease term on a straight-line basis. Residential leases are renewable upon consent of both parties on an annual or monthly basis. The Company also generates lease revenue from non-residential leases that are generally for terms ranging between five to ten years . The non-residential leases generally consist of ground floor retail spaces and master-leased parking garages that serve as additional amenities for our residents. The non-residential leases may include lease income related to such items as utility recoveries, parking rent and storage rent that the Company treats as a single lease component because the amenities cannot be leased on their own and the timing and pattern of revenue recognition are the same. The collection of lease payments at lease commencement is probable and therefore the Company subsequently recognizes lease income over the lease term on a straight-line basis. Non-residential leases are renewable with market-based renewal options. The following table presents the lease income types relating to lease payments for residential and non-residential leases along with the total other rental income for the nine months ended September 30, 2022 and 2021 (amounts in thousands): Nine Months Ended September 30, 2022 Nine Months Ended September 30, 2021 Income Type Residential Non-Residential Total Residential Non-Residential Total Residential and non-residential rent $ 1,812,928 $ 48,279 $ 1,861,207 $ 1,629,778 $ 45,680 $ 1,675,458 Utility recoveries (RUBS income) (1) 59,826 596 60,422 55,331 519 55,850 Parking rent 32,546 322 32,868 30,403 465 30,868 Other lease revenue (2) ( 4,016 ) ( 568 ) ( 4,584 ) ( 19,442 ) 2,914 ( 16,528 ) Total lease revenue $ 1,901,284 $ 48,629 1,949,913 $ 1,696,070 $ 49,578 1,745,648 Parking revenue 27,701 18,455 Other revenue 57,863 54,764 Total other rental income (3) 85,564 73,219 Rental income $ 2,035,477 $ 1,818,867 (1) RUBS income primarily consists of variable payments representing the recovery of utility costs from residents. (2) Other lease revenue consists of the revenue adjustment related to bad debt and other miscellaneous lease revenue. (3) Other rental income is accounted for under the revenue recognition standard. The following table presents the lease income types relating to lease payments for residential and non-residential leases along with the total other rental income for the quarters ended September 30, 2022 and 2021 (amounts in thousands): Quarter Ended September 30, 2022 Quarter Ended September 30, 2021 Income Type Residential Non-Residential Total Residential Non-Residential Total Residential and non-residential rent $ 620,880 $ 16,184 $ 637,064 $ 551,474 $ 14,443 $ 565,917 Utility recoveries (RUBS income) (1) 20,243 227 20,470 18,798 189 18,987 Parking rent 10,840 120 10,960 10,513 103 10,616 Other lease revenue (2) ( 3,127 ) ( 371 ) ( 3,498 ) ( 472 ) 1,776 1,304 Total lease revenue $ 648,836 $ 16,160 664,996 $ 580,313 $ 16,511 596,824 Parking revenue 9,270 6,883 Other revenue 20,833 19,499 Total other rental income (3) 30,103 26,382 Rental income $ 695,099 $ 623,206 (1) RUBS income primarily consists of variable payments representing the recovery of utility costs from residents. (2) Other lease revenue consists of the revenue adjustment related to bad debt and other miscellaneous lease revenue. (3) Other rental income is accounted for under the revenue recognition standard. The following table presents residential and non-residential accounts receivable and straight-line receivable balances for the Company’s properties as of September 30, 2022 and December 31, 2021 (amounts in thousands): Residential Non-Residential Balance Sheet (Other assets): September 30, 2022 December 31, 2021 September 30, 2022 December 31, 2021 Resident/tenant accounts receivable balances $ 34,939 $ 37,959 $ 3,951 $ 3,218 Allowance for doubtful accounts ( 30,543 ) ( 33,121 ) ( 2,767 ) ( 2,365 ) Net receivable balances $ 4,396 (1) $ 4,838 $ 1,184 $ 853 Straight-line receivable balances $ 3,466 $ 7,460 $ 13,792 $ 13,021 (1) The Company held residential security deposits approximating 53.9 % of the net residential receivable balance at September 30, 2022 . The following table presents residential bad debt for the Company’s properties for the nine months and quarters ended September 30, 2022 and 2021 (amounts in thousands): Nine Months Ended September 30, Quarter Ended September 30, Income Statement (Rental income): 2022 2021 2022 2021 Bad debt, net (1) $ 14,854 $ 29,751 $ 6,707 $ 3,979 % of rental income 0.8 % 1.7 % 1.0 % 0.7 % (1) Bad debt, net benefited from additional resident payments due to governmental rental assistance programs of approximately $ 32.5 million and $ 18.5 million for the nine months ended September 30, 2022 and 2021 , respectively, and $ 8.0 million and $ 13.5 million for the quarters ended September 30, 2022 and 2021 , respectively. The resident payments from governmental rental assistance decreased in the third quarter of 2022 as compared to the prior year period as these programs wind down.

Debt

Debt	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Debt	9. Debt EQR does not have any indebtedness as all debt is incurred by the Operating Partnership. Weighted average interest rates noted below for the nine months ended September 30, 2022 include the effect of any derivative instruments and amortization of premiums/discounts/OCI (other comprehensive income) on debt and derivatives. Mortgage Notes Payable The following table summarizes the Company’s mortgage notes payable activity for the nine months ended September 30, 2022 (amounts in thousands): Mortgage notes Proceeds Lump sum Scheduled Amortization Amortization Mortgage notes Fixed Rate Debt: Secured – Conventional $ 1,896,472 $ — $ ( 260,874 ) $ ( 3,147 ) $ 935 $ 956 $ 1,634,342 Floating Rate Debt: Secured – Conventional 59,890 37,429 (2) — ( 39 ) — 331 97,611 Secured – Tax Exempt 234,839 — — — 930 105 235,874 Floating Rate Debt 294,729 37,429 — ( 39 ) 930 436 333,485 Total $ 2,191,201 $ 37,429 $ ( 260,874 ) $ ( 3,186 ) $ 1,865 $ 1,392 $ 1,967,827 (1) Represents amortization of deferred financing costs, net of debt financing costs. (2) See Note 6 for additional discussion of the variable rate construction mortgage debt. The following table summarizes certain interest rate and maturity date information as of and for the nine months ended September 30, 2022: September 30, 2022 Interest Rate Ranges 0.10 % - 4.21 % Weighted Average Interest Rate 3.39 % Maturity Date Ranges 2023 - 2061 As of September 30, 2022, the Company had $ 250.0 million of secured debt (primarily tax-exempt bonds) subject to third-party credit enhancement. Notes The following table summarizes the Company’s notes activity for the nine months ended September 30, 2022 (amounts in thousands): Notes, net as of Proceeds Lump sum Amortization Amortization Notes, net as of Fixed Rate Debt: Unsecured – Public $ 5,835,222 $ — $ ( 500,000 ) $ 2,258 $ 3,327 $ 5,340,807 (1) Represents amortization of deferred financing costs, net of debt financing costs. T he following table summarizes certain interest rate and maturity date information as of and for the nine months ended September 30, 2022: September 30, 2022 Interest Rate Ranges 1.85 % - 7.57 % Weighted Average Interest Rate 3.65 % Maturity Date Ranges 2025 - 2047 The Company’s unsecured public notes contain certain financial and operating covenants including, among other things, maintenance of certain financial ratios. The Company was in compliance with its unsecured public debt covenants for the nine months ended September 30, 2022. Line of Credit and Commercial Paper The Company has a $ 2.5 billion unsecured revolving credit facility maturing November 1, 2024 . The Company has the ability to increase available borrowings by an additional $ 750.0 million by adding lenders to the facility, obtaining the agreement of existing lenders to increase their commitments or incurring one or more term loans. The interest rate on advances under the facility will generally be LIBOR plus a spread (currently 0.775 %), or based on bids received from the lending group, and the Company pays an annual facility fee (currently 0.125 %). Both the spread and the facility fee are dependent on the Company’s senior unsecured credit rating. The Company did no t borrow any amounts under its revolving credit facility during the nine months ended September 30, 2022. The Company has an unsecured commercial paper note program under which it may borrow up to a maximum of $ 1.0 billion subject to market conditions. The notes will be sold under customary terms in the United States commercial paper note market and will rank pari passu with all of the Company’s other unsecured senior indebtedness. The notes bear interest at various floating rates with a weighted average interest rate of 1.18 % for the nine months ended September 30, 2022 and a weighted average maturity of 28 days as of September 30, 2022. The weighted average amount outstanding for the nine months ended September 30, 2022 was approximately $ 177.9 million. The Company limits its utilization of the revolving credit facility in order to maintain liquidity to support its $ 1.0 billion commercial paper program along with certain other obligations. The following table presents the availability on the Company’s unsecured revolving credit facility as of September 30, 2022 (amounts in thousands): September 30, 2022 Unsecured revolving credit facility commitment $ 2,500,000 Commercial paper balance outstanding ( 190,000 ) Unsecured revolving credit facility balance outstanding — Other restricted amounts ( 3,463 ) Unsecured revolving credit facility availability $ 2,306,537 Other The following table summarizes the Company’s total debt extinguishment costs recorded as additional interest expense for the nine months and quarters ended September 30, 2022 and 2021 (amounts in thousands): Nine Months Ended September 30, Quarter Ended September 30, 2022 2021 2022 2021 Write-offs of unamortized deferred financing costs $ 369 $ 264 $ 277 $ — Write-offs of unamortized (premiums)/discounts/OCI 3,947 — 3,570 — Total $ 4,316 $ 264 $ 3,847 $ —

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurements	10. Fair Value Measurements The valuation of financial instruments requires the Company to make estimates and judgments that affect the fair value of the instruments. The Company, where possible, bases the fair values of its financial instruments on listed market prices and third-party quotes. Where these are not available, the Company bases its estimates on current instruments with similar terms and maturities or on other factors relevant to the financial instruments. In the normal course of business, the Company is exposed to the effect of interest rate changes. The Company may seek to manage these risks by following established risk management policies and procedures including the use of derivatives to hedge interest rate risk on debt instruments. The Company may also use derivatives to manage commodity prices in the daily operations of the business. A three-level valuation hierarchy exists for disclosure of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The three levels are defined as follows: • Level 1 – Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2 – Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. • Level 3 – Inputs to the valuation methodology are unobservable and significant to the fair value measurement. The Company’s derivative positions are valued using models developed by the respective counterparty as well as models applied internally by the Company that use as their inputs readily observable market parameters (such as forward yield curves and credit default swap data). The following table summarizes the inputs to the valuations for each type of fair value measurement: Fair Value Measurement Type Valuation Inputs Employee holdings (other than Common Shares) within the supplemental executive retirement plan (the “SERP”) Quoted market prices for identical assets. These holdings are included in other assets and other liabilities on the consolidated balance sheets. Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Quoted market price of Common Shares. Mortgage notes payable and private unsecured debt (including its commercial paper and line of credit, if applicable) Indicative rates provided by lenders of similar loans. Public unsecured notes Quoted market prices for each underlying issuance. The fair values of the Company’s financial instruments (other than mortgage notes payable, unsecured notes, commercial paper, line of credit and derivative instruments), including cash and cash equivalents and other financial instruments, approximate their carrying or contract value. The following table provides a summary of the carrying and fair values for the Company’s mortgage notes payable and unsecured debt (including its commercial paper and line of credit, if applicable) at September 30, 2022 and December 31, 2021, respectively (amounts in thousands): September 30, 2022 December 31, 2021 Carrying Value Estimated Fair Carrying Value Estimated Fair Mortgage notes payable, net $ 1,967,827 $ 1,811,596 $ 2,191,201 $ 2,193,689 Unsecured debt, net 5,530,364 4,893,686 6,150,252 6,798,309 Total debt, net $ 7,498,191 $ 6,705,282 $ 8,341,453 $ 8,991,998 The following table summarizes the Company’s consolidated derivative instruments at September 30, 2022 (dollar amounts are in thousands): Forward Starting Current Notional Balance $ 350,000 Lowest Interest Rate 2.447 % Highest Interest Rate 2.972 % Maturity Date 2033 (1) Forward Starting Swaps – Designed to partially fix interest rates in advance of planned future debt issuances. These swaps have mandatory counterparty terminations in 2024 and are targeted for certain 2023 debt issuances. The following tables provide a summary of the fair value measurements for each major category of assets and liabilities measured at fair value on a recurring basis and the location within the accompanying consolidated balance sheets at September 30, 2022 and December 31, 2021, respectively (amounts in thousands): Fair Value Measurements at Reporting Date Using Description Balance Sheet 9/30/2022 Quoted Prices in Significant Other Significant Assets Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps Other Assets $ 23,413 $ — $ 23,413 $ — Supplemental Executive Retirement Plan Other Assets 125,585 125,585 — — Total $ 148,998 $ 125,585 $ 23,413 $ — Liabilities Supplemental Executive Retirement Plan Other Liabilities $ 125,585 $ 125,585 $ — $ — Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Mezzanine $ 370,537 $ — $ 370,537 $ — Fair Value Measurements at Reporting Date Using Description Balance Sheet 12/31/2021 Quoted Prices in Significant Other Significant Assets Supplemental Executive Retirement Plan Other Assets $ 164,650 $ 164,650 $ — $ — Liabilities Supplemental Executive Retirement Plan Other Liabilities $ 164,650 $ 164,650 $ — $ — Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Mezzanine $ 498,977 $ — $ 498,977 $ — The following tables provide a summary of the effect of cash flow hedges on the Company’s accompanying consolidated statements of operations and comprehensive income for the nine months ended September 30, 2022 and 2021, respectively (amounts in thousands): September 30, 2022 Amount of Location of Amount of Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps $ 23,413 Interest expense $ ( 9,987 ) Total $ 23,413 $ ( 9,987 ) September 30, 2021 Amount of Location of Amount of Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps $ — Interest expense $ ( 7,000 ) Total $ — $ ( 7,000 ) As of September 30, 2022 and December 31, 2021 , there were approximately $ 0.9 million and $ 34.3 million in deferred losses, net, included in accumulated other comprehensive income (loss), respectively, related to previously settled and unsettled derivative instruments, of which an estimated $ 3.8 million may be recognized as additional interest expense during the twelve months ending September 30, 2023.

Earnings Per Share and Earnings

Earnings Per Share and Earnings Per Unit	9 Months Ended
	Sep. 30, 2022
Earnings Per Share [Abstract]
Earnings Per Share And Earnings Per Unit	11. Earnings Per Share and Earnings Per Unit Equity Residential The following tables set forth the computation of net income per share – basic and net income per share – diluted for the Company (amounts in thousands except per share amounts): Nine Months Ended September 30, Quarter Ended September 30, 2022 2021 2022 2021 Numerator for net income per share – basic: Net income $ 641,641 $ 835,736 $ 335,165 $ 447,332 Allocation to Noncontrolling Interests – Operating Partnership ( 21,024 ) ( 27,903 ) ( 10,997 ) ( 14,847 ) Net (income) loss attributable to Noncontrolling ( 2,726 ) ( 1,957 ) ( 1,143 ) ( 534 ) Preferred distributions ( 2,318 ) ( 2,318 ) ( 773 ) ( 773 ) Numerator for net income per share – basic $ 615,573 $ 803,558 $ 322,252 $ 431,178 Numerator for net income per share – diluted: Net income $ 641,641 $ 835,736 $ 335,165 $ 447,332 Net (income) loss attributable to Noncontrolling ( 2,726 ) ( 1,957 ) ( 1,143 ) ( 534 ) Preferred distributions ( 2,318 ) ( 2,318 ) ( 773 ) ( 773 ) Numerator for net income per share – diluted $ 636,597 $ 831,461 $ 333,249 $ 446,025 Denominator for net income per share – basic and diluted: Denominator for net income per share – basic 375,710 373,474 375,850 374,308 Effect of dilutive securities: OP Units 11,893 12,367 11,895 12,019 Long-term compensation shares/units 1,785 1,801 1,555 2,047 ATM forward sales 6 — — — Denominator for net income per share – diluted 389,394 387,642 389,300 388,374 Net income per share – basic $ 1.64 $ 2.15 $ 0.86 $ 1.15 Net income per share – diluted $ 1.63 $ 2.14 $ 0.86 $ 1.15 ERP Operating Limited Partnership The following tables set forth the computation of net income per Unit – basic and net income per Unit – diluted for the Operating Partnership (amounts in thousands except per Unit amounts): Nine Months Ended September 30, Quarter Ended September 30, 2022 2021 2022 2021 Numerator for net income per Unit – basic and diluted: Net income $ 641,641 $ 835,736 $ 335,165 $ 447,332 Net (income) loss attributable to Noncontrolling ( 2,726 ) ( 1,957 ) ( 1,143 ) ( 534 ) Allocation to Preference Units ( 2,318 ) ( 2,318 ) ( 773 ) ( 773 ) Numerator for net income per Unit – basic and diluted $ 636,597 $ 831,461 $ 333,249 $ 446,025 Denominator for net income per Unit – basic and diluted: Denominator for net income per Unit – basic 387,603 385,841 387,745 386,327 Effect of dilutive securities: Dilution for Units issuable upon assumed exercise/vesting 1,785 1,801 1,555 2,047 ATM forward sales 6 — — — Denominator for net income per Unit – diluted 389,394 387,642 389,300 388,374 Net income per Unit – basic $ 1.64 $ 2.15 $ 0.86 $ 1.15 Net income per Unit – diluted $ 1.63 $ 2.14 $ 0.86 $ 1.15

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2022
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	12. Commitments and Contingencies Commitments Real Estate Development Commitments As of September 30, 2022 , the Company has both consolidated and unconsolidated real estate projects under development. The following table summarizes the gross remaining total project costs for the Company’s projects under development at September 30, 2022 (total project costs remaining in thousands): Projects Apartment Units Total Project Costs Remaining (1) Projects Under Development Consolidated 2 537 $ 171,301 Unconsolidated 6 1,982 402,321 Total Projects Under Development 8 2,519 $ 573,622 (1) The Company’s share of the $ 573.6 million in total project costs remaining approximates $ 158.8 million, with the balance funded by the Company’s joint venture partners (approximately $ 6.4 million) and/or applicable construction loans (approximately $ 408.4 million). We have entered into, and may continue in the future to enter into, joint venture agreements with third-party partners for the development of multifamily rental properties. The joint venture agreements with each development partner include buy-sell provisions that provide the right, but not the obligation, for the Company to acquire each respective partner’s interests or sell its interests at any time following the occurrence of certain pre-defined events described in the joint venture agreements. See Note 6 for additional discussion. Other Commitments We have entered into, and may continue in the future to enter into, real estate technology and other real estate fund investments. At September 30, 2022 , the Company has invested in eight real estate technology funds and one other real estate investment fund with aggregate remaining commitments of approximately $ 22.1 million. Contingencies Litigation and Legal Matters The Company, as an owner of real estate, is subject to various federal, state and local laws. Compliance by the Company with existing laws has not had a material adverse effect on the Company. However, the Company cannot predict the impact of new or changed laws or regulations on its current properties or on properties that it may acquire in the future. The Company does not believe there is any litigation pending or threatened against it that, individually or in the aggregate, may reasonably be expected to have a material adverse effect on the Company.

Reportable Segments

Reportable Segments	9 Months Ended
	Sep. 30, 2022
Segment Reporting [Abstract]
Reportable Segments	13. Reportable Segments Operating segments are defined as components of an enterprise that engage in business activities from which they may earn revenues and incur expenses and about which discrete financial information is available that is evaluated regularly by the chief operating decision maker. The chief operating decision maker decides how resources are allocated and assesses performance on a recurring basis at least quarterly. The Company’s primary business is the acquisition, development and management of multifamily residential properties, which includes the generation of rental and other related income through the leasing of apartment units to residents. The chief operating decision maker evaluates the Company’s operating performance geographically by market and both on a same store and non-same store basis. While the Company does maintain a non-residential presence, it accounts for approximately 3.7 % of total revenues for the nine months ended September 30, 2022 and is designed as an amenity for our residential residents. The chief operating decision maker evaluates the performance of each property on a consolidated residential and non-residential basis. The Company’s geographic consolidated same store operating segments represent its reportable segments. The Company’s development activities are other business activities that do not constitute an operating segment and as such, have been aggregated in the “Other” category in the tables presented below. All revenues are from external customers and there is no customer who contributed 10% or more of the Company’s total revenues during the nine months and quarters ended September 30, 2022 and 2021, respectively. The primary financial measure for the Company’s rental real estate segment is net operating income (“NOI”), which represents rental income less: 1) property and maintenance expense and 2) real estate taxes and insurance expense (all as reflected in the accompanying consolidated statements of operations and comprehensive income). The Company believes that NOI is helpful to investors as a supplemental measure of its operating performance because it is a direct measure of the actual operating results of the Company’s apartment properties. Revenues for all leases are reflected on a straight-line basis in accordance with GAAP for the current and comparable periods. The following table presents a reconciliation of NOI from our rental real estate for the nine months and quarters ended September 30, 2022 and 2021, respectively (amounts in thousands): Nine Months Ended September 30, Quarter Ended September 30, 2022 2021 2022 2021 Rental income $ 2,035,477 $ 1,818,867 $ 695,099 $ 623,206 Property and maintenance expense ( 365,277 ) ( 341,261 ) ( 124,048 ) ( 116,461 ) Real estate taxes and insurance expense ( 302,899 ) ( 297,780 ) ( 100,361 ) ( 96,909 ) Total operating expenses ( 668,176 ) ( 639,041 ) ( 224,409 ) ( 213,370 ) Net operating income $ 1,367,301 $ 1,179,826 $ 470,690 $ 409,836 The following tables present NOI from our rental real estate for each segment for the nine months and quarters ended September 30, 2022 and 2021, respectively, as well as total assets and capital expenditures at September 30, 2022 (amounts in thousands): Nine Months Ended September 30, 2022 Nine Months Ended September 30, 2021 Rental Operating NOI Rental Operating NOI Same store (1) Los Angeles $ 351,896 $ 103,121 $ 248,775 $ 316,206 $ 99,837 $ 216,369 Orange County 91,271 19,681 71,590 80,773 18,865 61,908 San Diego 64,540 14,574 49,966 58,210 13,892 44,318 Subtotal - Southern California 507,707 137,376 370,331 455,189 132,594 322,595 San Francisco 312,401 93,572 218,829 285,212 89,559 195,653 Washington, D.C. 306,161 102,564 203,597 290,255 97,407 192,848 New York 318,756 139,121 179,635 270,776 136,859 133,917 Seattle 210,011 59,222 150,789 190,386 61,092 129,294 Boston 194,640 60,003 134,637 173,953 57,478 116,475 Denver 32,505 9,129 23,376 28,732 8,482 20,250 Total same store 1,882,181 600,987 1,281,194 1,694,503 583,471 1,111,032 Non-same store/other Non-same store (2) 131,693 54,236 77,457 31,305 15,256 16,049 Other (3) 21,603 12,953 8,650 93,059 40,314 52,745 Total non-same store/other 153,296 67,189 86,107 124,364 55,570 68,794 Totals $ 2,035,477 $ 668,176 $ 1,367,301 $ 1,818,867 $ 639,041 $ 1,179,826 (1) For the nine months ended September 30, 2022 and 2021, same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2021, less properties subsequently sold, which represented 72,869 apartment units. (2) For the nine months ended September 30, 2022 and 2021, non-same store primarily includes properties acquired after January 1, 2021, plus any properties in lease-up and not stabilized as of January 1, 2021, and any properties undergoing major renovations. (3) Other includes development, other corporate operations and operations prior to disposition for properties sold. Quarter Ended September 30, 2022 Quarter Ended September 30, 2021 Rental Operating NOI Rental Operating NOI Same store (1) Los Angeles $ 119,269 $ 34,783 $ 84,486 $ 110,180 $ 33,568 $ 76,612 Orange County 31,252 6,875 24,377 28,263 6,455 21,808 San Diego 22,129 5,018 17,111 20,283 4,717 15,566 Subtotal - Southern California 172,650 46,676 125,974 158,726 44,740 113,986 San Francisco 106,382 31,984 74,398 96,451 30,173 66,278 Washington, D.C. 106,098 35,686 70,412 98,643 34,238 64,405 New York 112,595 46,194 66,401 93,454 45,282 48,172 Seattle 72,756 20,385 52,371 63,936 20,658 43,278 Boston 66,981 20,122 46,859 58,863 19,401 39,462 Denver 11,102 3,191 7,911 9,812 2,950 6,862 All Other Markets 2,148 794 1,354 1,933 697 1,236 Total same store 650,712 205,032 445,680 581,818 198,139 383,679 Non-same store/other Non-same store (2) 42,707 17,068 25,639 15,702 7,736 7,966 Other (3) 1,680 2,309 ( 629 ) 25,686 7,495 18,191 Total non-same store/other 44,387 19,377 25,010 41,388 15,231 26,157 Totals $ 695,099 $ 224,409 $ 470,690 $ 623,206 $ 213,370 $ 409,836 (1) For the quarters ended September 30, 2022 and 2021, same store primarily includes all properties acquired or completed that were stabilized prior to July 1, 2021, less properties subsequently sold, which represented 73,402 apartment units. (2) For the quarters ended September 30, 2022 and 2021, non-same store primarily includes properties acquired after July 1, 2021, plus any properties in lease-up and not stabilized as of July 1, 2021, and any properties undergoing major renovations. (3) Other includes development, other corporate operations and operations prior to disposition for properties sold. Nine Months Ended September 30, 2022 Total Assets Capital Expenditures Same store (1) Los Angeles $ 2,604,866 $ 21,459 Orange County 358,574 4,170 San Diego 227,344 4,206 Subtotal - Southern California 3,190,784 29,835 San Francisco 3,090,195 21,988 Washington, D.C. 3,057,549 22,596 New York 3,424,747 17,365 Seattle 2,089,219 16,569 Boston 1,692,529 16,349 Denver 477,354 939 Total same store 17,022,377 125,641 Non-same store/other Non-same store (2) 2,517,480 15,524 Other (3) 725,548 542 Total non-same store/other 3,243,028 16,066 Totals $ 20,265,405 $ 141,707 (1) Same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2021, less properties subsequently sold, which represented 72,869 apartment units. (2) Non-same store primarily includes properties acquired after January 1, 2021, plus any properties in lease-up and not stabilized as of January 1, 2021, and any properties undergoing major renovations. (3) Other includes development, other corporate operations and capital expenditures for properties sold.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2022
Subsequent Events [Abstract]
Subsequent Events	14. Subsequent Events Subsequent to September 30, 2022, the Company: • Settled all of the forward sales agreements outstanding as of September 30, 2022 for a total of 1,740,550 Common Shares, at a weighted average forward price per share of $ 80.22 , which is inclusive of adjustments made to reflect the then-current federal funds rate and the amount of dividends paid to holders of the Company's Common Shares, for net proceeds of approximately $ 139.6 million. Concurrent with this transaction, ERPOP issued the same amount of OP Units to EQR in exchange for the net proceeds. See Note 3 for additional discussion of the Company’s ATM program; • Replaced its existing $ 2.5 billion facility with a new $ 2.5 billion unsecured revolving credit facility maturing October 26, 2027 ; and • Entered into $ 50.0 million of forward starting swaps to hedge changes in interest rates related to future taxable secured or unsecured debt issuances.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2022
Summary Of Significant Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States (“GAAP”) for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) and certain reclassifications considered necessary for a fair presentation have been included. Operating results for the nine months ended September 30, 2022 are not necessarily indicative of the results that may be expected for the year ending December 31, 2022. In preparation of the Company’s financial statements in conformity with accounting principles generally accepted in the United States, management makes estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. The balance sheets at December 31, 2021 have been derived from the audited financial statements at that date but do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. For further information, including definitions of capitalized terms not defined herein, refer to the consolidated financial statements and footnotes thereto included in the Company’s and the Operating Partnership’s Annual Report on Form 10-K for the year ended December 31, 2021 .
Income and Other Taxes	Income and Other Taxes EQR has elected to be taxed as a REIT. This, along with the nature of the operations of its operating properties, resulted in no provision for federal income taxes at the EQR level. In addition, ERPOP generally is not liable for federal income taxes as the partners recognize their allocable share of income or loss in their tax returns; therefore no provision for federal income taxes has been made at the ERPOP level. Historically, the Company has generally only incurred certain state and local income, excise and franchise taxes. The Company has elected taxable REIT subsidiary (“TRS”) status for certain of its corporate subsidiaries and, as a result, these entities will incur both federal and state income taxes on any taxable income of such entities after consideration of any net operating losses.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In August 2020, the Financial Accounting Standards Board (“FASB”) issued an amendment to the debt and equity financial instruments standards which simplifies the accounting for convertible instruments and accounting for contracts in an entity’s own equity. The Company adopted the standard when effective on January 1, 2022 and it had no impact on its consolidated results of operations and financial position. In March 2020, the FASB issued an amendment to the reference rate reform standard which provides the option for a limited period of time to ease the potential burden in accounting for, or recognizing the effects of, reference rate reform on contract modifications and hedge accounting. The new standard was effective for the Company upon issuance and elections can be made through December 31, 2022, subject to a proposed extension to December 31, 2024. The Company elected to apply the hedge accounting expedients and application of these expedients preserves the presentation of derivatives consistent with past presentation. The Company continues to evaluate the impact of the guidance and may apply other elections as applicable as additional changes in the market occur.

Business (Tables)

Business (Tables)	9 Months Ended
	Sep. 30, 2022
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Ownership Breakdown	The ownership breakdown includes (table does not include any uncompleted development properties): Properties Apartment Units Wholly Owned Properties 293 76,480 Partially Owned Properties – Consolidated 15 3,114 308 79,594

Equity, Capital and Other Int_2

Equity, Capital and Other Interests (Tables)	9 Months Ended
	Sep. 30, 2022
Class Of Stock [Line Items]
Changes in Issued and Outstanding Common Shares and Units	The following table presents the changes in the Company’s issued and outstanding Common Shares and Units for the nine months ended September 30, 2022 and 2021: 2022 2021 Common Shares Common Shares outstanding at January 1, 375,527,195 372,302,000 Common Shares Issued: Conversion of OP Units 37,661 1,153,963 Exercise of share options 381,384 1,401,755 Employee Share Purchase Plan (ESPP) 49,662 59,297 Restricted share grants, net 173,351 85,573 Common Shares outstanding at September 30, 376,169,253 375,002,588 Units Units outstanding at January 1, 12,659,027 13,858,073 Restricted unit grants, net 223,242 155,638 Conversion of OP Units to Common Shares ( 37,661 ) ( 1,153,963 ) Units outstanding at September 30, 12,844,608 12,859,748 Total Common Shares and Units outstanding at September 30, 389,013,861 387,862,336 Units Ownership Interest in Operating Partnership 3.3 % 3.3 %
Changes in Redemption Value of Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	The following table presents the changes in the redemption value of the Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners for the nine months ended September 30, 2022 and 2021, respectively (amounts in thousands): 2022 2021 Balance at January 1, $ 498,977 $ 338,951 Change in market value ( 127,570 ) 119,237 Change in carrying value ( 870 ) 1,745 Balance at September 30, $ 370,537 $ 459,933
Issued and Outstanding Preferred Shares and Preference Units	The following table presents the Company’s issued and outstanding Preferred Shares/Preference Units as of September 30, 2022 and December 31, 2021: Amounts in thousands Annual Call Dividend Per September 30, December 31, Date (1) Share/Unit (2) 2022 2021 Preferred Shares/Preference Units of beneficial interest, $ 0.01 par value; 100,000,000 shares authorized: 8.29 % Series K Cumulative Redeemable Preferred Shares/Preference 50 per share/unit; 745,600 shares/units issued 12/10/26 $ 4.145 $ 37,280 $ 37,280 $ 37,280 $ 37,280 (1) On or after the call date, redeemable Preferred Shares/Preference Units may be redeemed for cash at the option of the Company or the Operating Partnership, respectively, in whole or in part, at a redemption price equal to the liquidation price per share/unit, plus accrued and unpaid distributions, if any. (2) Dividends on Preferred Shares/Preference Units are payable quarterly.
ERPOP [Member]
Class Of Stock [Line Items]
Changes in Issued and Outstanding Common Shares and Units	The following table presents the changes in the Operating Partnership’s issued and outstanding General Partner Units and Limited Partner Units for the nine months ended September 30, 2022 and 2021: 2022 2021 General and Limited Partner Units General and Limited Partner Units outstanding at January 1, 388,186,222 386,160,073 Issued to General Partner: Exercise of EQR share options 381,384 1,401,755 EQR’s Employee Share Purchase Plan (ESPP) 49,662 59,297 EQR’s restricted share grants, net 173,351 85,573 Issued to Limited Partners: Restricted unit grants, net 223,242 155,638 General and Limited Partner Units outstanding at September 30, 389,013,861 387,862,336 Limited Partner Units Limited Partner Units outstanding at January 1, 12,659,027 13,858,073 Limited Partner restricted unit grants, net 223,242 155,638 Conversion of Limited Partner OP Units to EQR Common Shares ( 37,661 ) ( 1,153,963 ) Limited Partner Units outstanding at September 30, 12,844,608 12,859,748 Limited Partner Units Ownership Interest in Operating Partnership 3.3 % 3.3 %

Real Estate (Tables)

Real Estate (Tables)	9 Months Ended
	Sep. 30, 2022
Real Estate [Abstract]
Summary of Carrying Amounts of Investment in Real Estate	The following table summarizes the carrying amounts for the Company’s investment in real estate (at cost) as of September 30, 2022 and December 31, 2021 (amounts in thousands): September 30, 2022 December 31, 2021 Land $ 5,580,878 $ 5,814,790 Depreciable property: Buildings and improvements 19,445,470 19,632,284 Furniture, fixtures and equipment 2,295,387 2,220,203 In-Place lease intangibles 510,816 518,324 Projects under development: Land 3,201 — Construction-in-progress 86,146 24,307 Land held for development: Land 46,160 46,160 Construction-in-progress 14,005 16,838 Investment in real estate 27,982,063 28,272,906 Accumulated depreciation ( 8,813,578 ) ( 8,354,282 ) Investment in real estate, net $ 19,168,485 $ 19,918,624
Acquired Properties From Unaffiliated Parties	During the nine months ended September 30, 2022, the Company acquired the following from unaffiliated parties (purchase price in thousands): Properties Apartment Units Purchase Price Rental Properties – Consolidated (1) 1 172 $ 113,000 Total 1 172 $ 113,000 (1) Purchase price includes an allocation of approximately $ 25.3 million to land and $ 87.7 million to depreciable property (inclusive of capitalized closing costs).
Disposed Properties to Unaffiliated Parties	During the nine months ended September 30, 2022, the Company disposed of the following to unaffiliated parties (sales price in thousands): Properties Apartment Units Sales Price Rental Properties – Consolidated 3 945 $ 746,150 Total 3 945 $ 746,150

Commitments to Acquire_Dispos_2

Commitments to Acquire/Dispose of Real Estate (Tables)	9 Months Ended
	Sep. 30, 2022
Commitments To Acquire Dispose Of Real Estate [Abstract]
Summary of Separate Agreements to Dispose	The Company has entered into an agreement to dispose of the following (sales price and net book value in thousands): Properties Apartment Units Sales Price Net Book Value at Land Parcels (one) — — $ 5,500 $ 3,930 Total — — $ 5,500 $ 3,930

Investments in Partially Owne_2

Investments in Partially Owned Entities (Tables)	9 Months Ended
	Sep. 30, 2022
Investments In Partially Owned Entities [Abstract]
Summary of Company's Consolidated Joint Ventures	The following table summarizes the Company’s consolidated joint ventures as of September 30, 2022: Operating Properties (1) Project Under Development (2) Properties Apartment Units Project Apartment Units Consolidated Joint Ventures (VIE) 15 3,114 1 312 (1) During the nine months ended September 30, 2022 , the Company acquired its joint venture partner’s 25 % interest in a 432 -unit apartment property for $ 32.2 million, and the property is now wholly owned. In connection with the buyout, the carrying amount of the Noncontrolling Interests – Partially Owned Properties totaling $ 4.8 million was reduced to zero and the remaining $ 27.4 million was recorded to paid in capital/general partner capital. (2) The land under this project is subject to a long-term ground lease.
Summary of Consolidated Assets and Liabilities Related to the VIEs	The following table provides consolidated assets and liabilities related to the VIEs discussed above as of September 30, 2022 and December 31, 2021 (amounts in thousands): September 30, 2022 December 31, 2021 Consolidated Assets $ 675,974 $ 912,955 Consolidated Liabilities $ 148,071 $ 251,424
Summary of Variable Rate Construction Mortgage Debt	The following table and information summarizes the variable rate construction mortgage debt that is non-recourse to the Company at September 30, 2022 (aggregate and amounts borrowed under loan commitments in thousands): Recently Completed Operating Property (1) Project Under Development Number of joint ventures with debt financing 1 1 Aggregate loan commitments $ 67,589 $ 73,344 Amounts borrowed under loan commitments (2) $ 64,816 $ 34,356 Maturity dates 2023 2025 (1) The maturity date of the construction loan was extended to June 25, 2023. (2) See Note 9 for the current period proceeds of secured conventional floating rate debt under Mortgage Notes Payable .
Summary of Company's Investment in Unconsolidated Entities	The following table and information summarizes the Company’s investments in unconsolidated entities as of September 30, 2022 and December 31, 2021 (amounts in thousands except for ownership percentage): September 30, 2022 December 31, 2021 Ownership Percentage Investments in Unconsolidated Entities: Various Real Estate Holdings (VIE) $ 36,372 $ 36,024 Varies Projects Under Development and Land Held for Development (VIE) 195,974 72,488 62 % - 95 % (1) Real Estate Technology Funds/Companies (VIE) 24,206 19,347 Varies Other ( 241 ) ( 411 ) Varies Investments in Unconsolidated Entities $ 256,311 $ 127,448 (1) In certain instances, the joint venture agreements contain provisions for promoted interests in favor of our joint venture partner. If the terms of the promoted interest are attained, then our share of the proceeds from a sale or other capital event of the unconsolidated entity may be less than the indicated ownership percentage.
Summary of Company's Unconsolidated Joint Ventures Deemed to be VIEs	The following table summarizes the Company’s unconsolidated joint ventures that were deemed to be VIEs as of September 30, 2022: Real Estate Holdings (1) Projects Under Development (2), (5) Land Held for Development (2), (3) Entities Projects Apartment Units (4) Projects Apartment Units (4) Unconsolidated Joint Ventures (VIE) 2 6 1,982 2 745 (1) Represents entities that hold various real estate investments. (2) Represents separate unconsolidated joint ventures for the purpose of developing multifamily rental properties. (3) Represents separate unconsolidated joint ventures that have not yet started but are expected to start construction in the fourth quarter of 2022 and the second quarter of 2023. (4) Represents the intended number of apartment units to be developed. (5) The land parcel under one of the projects is subject to a long-term ground lease.
Summary of Information on Total Unconsolidated Development Joint Ventures	The following table provides information on total unconsolidated development joint ventures entered into during the nine months ended September 30, 2022 (amounts in thousands except for number of unconsolidated joint ventures): Number of unconsolidated joint ventures (1) 2 Apartment units (2) 797 Investments in unconsolidated entities – acquisitions $ 49,330 (1) The entities qualify as VIEs, but the Company is not the primary beneficiary because it does not have the power to direct the activities that most significantly impact the VIE’s performance. Therefore, the entities are unconsolidated and recorded using the equity method of accounting. See Note 2 of the Company’s and the Operating Partnership’s Annual Report on Form 10-K for the year ended December 31, 2021 for additional discussion. (2) Represents the intended number of apartment units to be developed.

Restricted Deposits (Tables)

Restricted Deposits (Tables)	9 Months Ended
	Sep. 30, 2022
Deposits Restricted [Abstract]
Restricted Deposits	The following table presents the Company’s restricted deposits as of September 30, 2022 and December 31, 2021 (amounts in thousands): September 30, 2022 December 31, 2021 Mortgage escrow deposits: Replacement reserves $ 12,213 $ 11,156 Mortgage principal reserves/sinking funds 23,484 19,104 Mortgage escrow deposits 35,697 30,260 Restricted cash: Tax-deferred (1031) exchange proceeds — 166,362 Earnest money on pending acquisitions — 2,000 Restricted deposits on real estate investments 235 284 Resident security and utility deposits 38,458 35,663 Other 2,289 1,835 Restricted cash 40,982 206,144 Restricted deposits $ 76,679 $ 236,404

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2022
Leases [Abstract]
Summary of Lease Income Types Relating to Lease Payments Along With the Total Other Rental Income	The following table presents the lease income types relating to lease payments for residential and non-residential leases along with the total other rental income for the nine months ended September 30, 2022 and 2021 (amounts in thousands): Nine Months Ended September 30, 2022 Nine Months Ended September 30, 2021 Income Type Residential Non-Residential Total Residential Non-Residential Total Residential and non-residential rent $ 1,812,928 $ 48,279 $ 1,861,207 $ 1,629,778 $ 45,680 $ 1,675,458 Utility recoveries (RUBS income) (1) 59,826 596 60,422 55,331 519 55,850 Parking rent 32,546 322 32,868 30,403 465 30,868 Other lease revenue (2) ( 4,016 ) ( 568 ) ( 4,584 ) ( 19,442 ) 2,914 ( 16,528 ) Total lease revenue $ 1,901,284 $ 48,629 1,949,913 $ 1,696,070 $ 49,578 1,745,648 Parking revenue 27,701 18,455 Other revenue 57,863 54,764 Total other rental income (3) 85,564 73,219 Rental income $ 2,035,477 $ 1,818,867 (1) RUBS income primarily consists of variable payments representing the recovery of utility costs from residents. (2) Other lease revenue consists of the revenue adjustment related to bad debt and other miscellaneous lease revenue. (3) Other rental income is accounted for under the revenue recognition standard. The following table presents the lease income types relating to lease payments for residential and non-residential leases along with the total other rental income for the quarters ended September 30, 2022 and 2021 (amounts in thousands): Quarter Ended September 30, 2022 Quarter Ended September 30, 2021 Income Type Residential Non-Residential Total Residential Non-Residential Total Residential and non-residential rent $ 620,880 $ 16,184 $ 637,064 $ 551,474 $ 14,443 $ 565,917 Utility recoveries (RUBS income) (1) 20,243 227 20,470 18,798 189 18,987 Parking rent 10,840 120 10,960 10,513 103 10,616 Other lease revenue (2) ( 3,127 ) ( 371 ) ( 3,498 ) ( 472 ) 1,776 1,304 Total lease revenue $ 648,836 $ 16,160 664,996 $ 580,313 $ 16,511 596,824 Parking revenue 9,270 6,883 Other revenue 20,833 19,499 Total other rental income (3) 30,103 26,382 Rental income $ 695,099 $ 623,206 (1) RUBS income primarily consists of variable payments representing the recovery of utility costs from residents. (2) Other lease revenue consists of the revenue adjustment related to bad debt and other miscellaneous lease revenue. (3) Other rental income is accounted for under the revenue recognition standard.
Summary of Residential and Non-Residential Accounts Receivable and Straight-Line Receivable Balances	The following table presents residential and non-residential accounts receivable and straight-line receivable balances for the Company’s properties as of September 30, 2022 and December 31, 2021 (amounts in thousands): Residential Non-Residential Balance Sheet (Other assets): September 30, 2022 December 31, 2021 September 30, 2022 December 31, 2021 Resident/tenant accounts receivable balances $ 34,939 $ 37,959 $ 3,951 $ 3,218 Allowance for doubtful accounts ( 30,543 ) ( 33,121 ) ( 2,767 ) ( 2,365 ) Net receivable balances $ 4,396 (1) $ 4,838 $ 1,184 $ 853 Straight-line receivable balances $ 3,466 $ 7,460 $ 13,792 $ 13,021 (1) The Company held residential security deposits approximating 53.9 % of the net residential receivable balance at September 30, 2022 .
Summary of Residential Bad Debt for Company's Properties	The following table presents residential bad debt for the Company’s properties for the nine months and quarters ended September 30, 2022 and 2021 (amounts in thousands): Nine Months Ended September 30, Quarter Ended September 30, Income Statement (Rental income): 2022 2021 2022 2021 Bad debt, net (1) $ 14,854 $ 29,751 $ 6,707 $ 3,979 % of rental income 0.8 % 1.7 % 1.0 % 0.7 % Bad debt, net benefited from additional resident payments due to governmental rental assistance programs of approximately $ 32.5 million and $ 18.5 million for the nine months ended September 30, 2022 and 2021 , respectively, and $ 8.0 million and $ 13.5 million for the quarters ended September 30, 2022 and 2021 , respectively. The resident payments from governmental rental assistance decreased in the third quarter of 2022 as compared to the prior year period as these programs wind down.

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2022
Debt Instrument [Line Items]
Summary of Mortgage Notes Payable Activity	The following table summarizes the Company’s mortgage notes payable activity for the nine months ended September 30, 2022 (amounts in thousands): Mortgage notes Proceeds Lump sum Scheduled Amortization Amortization Mortgage notes Fixed Rate Debt: Secured – Conventional $ 1,896,472 $ — $ ( 260,874 ) $ ( 3,147 ) $ 935 $ 956 $ 1,634,342 Floating Rate Debt: Secured – Conventional 59,890 37,429 (2) — ( 39 ) — 331 97,611 Secured – Tax Exempt 234,839 — — — 930 105 235,874 Floating Rate Debt 294,729 37,429 — ( 39 ) 930 436 333,485 Total $ 2,191,201 $ 37,429 $ ( 260,874 ) $ ( 3,186 ) $ 1,865 $ 1,392 $ 1,967,827 (1) Represents amortization of deferred financing costs, net of debt financing costs. (2) See Note 6 for additional discussion of the variable rate construction mortgage debt.
Summary of Notes Activity	The following table summarizes the Company’s notes activity for the nine months ended September 30, 2022 (amounts in thousands): Notes, net as of Proceeds Lump sum Amortization Amortization Notes, net as of Fixed Rate Debt: Unsecured – Public $ 5,835,222 $ — $ ( 500,000 ) $ 2,258 $ 3,327 $ 5,340,807 (1) Represents amortization of deferred financing costs, net of debt financing costs.
Schedule of Unsecured Revolving Credit Facility	The following table presents the availability on the Company’s unsecured revolving credit facility as of September 30, 2022 (amounts in thousands): September 30, 2022 Unsecured revolving credit facility commitment $ 2,500,000 Commercial paper balance outstanding ( 190,000 ) Unsecured revolving credit facility balance outstanding — Other restricted amounts ( 3,463 ) Unsecured revolving credit facility availability $ 2,306,537
Summary of Debt Extinguishment Costs Recorded as Additional Interest Expense	The following table summarizes the Company’s total debt extinguishment costs recorded as additional interest expense for the nine months and quarters ended September 30, 2022 and 2021 (amounts in thousands): Nine Months Ended September 30, Quarter Ended September 30, 2022 2021 2022 2021 Write-offs of unamortized deferred financing costs $ 369 $ 264 $ 277 $ — Write-offs of unamortized (premiums)/discounts/OCI 3,947 — 3,570 — Total $ 4,316 $ 264 $ 3,847 $ —
Mortgages [Member]
Debt Instrument [Line Items]
Summary of Certain Interest Rate and Maturity Date Information	The following table summarizes certain interest rate and maturity date information as of and for the nine months ended September 30, 2022: September 30, 2022 Interest Rate Ranges 0.10 % - 4.21 % Weighted Average Interest Rate 3.39 % Maturity Date Ranges 2023 - 2061
Notes [Member]
Debt Instrument [Line Items]
Summary of Certain Interest Rate and Maturity Date Information	he following table summarizes certain interest rate and maturity date information as of and for the nine months ended September 30, 2022: September 30, 2022 Interest Rate Ranges 1.85 % - 7.57 % Weighted Average Interest Rate 3.65 % Maturity Date Ranges 2025 - 2047

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Summary of Valuations for Each Type of Fair Value Measurement	The following table summarizes the inputs to the valuations for each type of fair value measurement: Fair Value Measurement Type Valuation Inputs Employee holdings (other than Common Shares) within the supplemental executive retirement plan (the “SERP”) Quoted market prices for identical assets. These holdings are included in other assets and other liabilities on the consolidated balance sheets. Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Quoted market price of Common Shares. Mortgage notes payable and private unsecured debt (including its commercial paper and line of credit, if applicable) Indicative rates provided by lenders of similar loans. Public unsecured notes Quoted market prices for each underlying issuance.
Summary of Carrying and Fair Values of Financial Instruments	The following table provides a summary of the carrying and fair values for the Company’s mortgage notes payable and unsecured debt (including its commercial paper and line of credit, if applicable) at September 30, 2022 and December 31, 2021, respectively (amounts in thousands): September 30, 2022 December 31, 2021 Carrying Value Estimated Fair Carrying Value Estimated Fair Mortgage notes payable, net $ 1,967,827 $ 1,811,596 $ 2,191,201 $ 2,193,689 Unsecured debt, net 5,530,364 4,893,686 6,150,252 6,798,309 Total debt, net $ 7,498,191 $ 6,705,282 $ 8,341,453 $ 8,991,998
Summarizes Company’s Consolidated Derivative Instruments	The following table summarizes the Company’s consolidated derivative instruments at September 30, 2022 (dollar amounts are in thousands): Forward Starting Current Notional Balance $ 350,000 Lowest Interest Rate 2.447 % Highest Interest Rate 2.972 % Maturity Date 2033 (1) Forward Starting Swaps – Designed to partially fix interest rates in advance of planned future debt issuances. These swaps have mandatory counterparty terminations in 2024 and are targeted for certain 2023 debt issuances.
Summary of Fair Value Measurements for Each Major Category of Assets and Liabilities Measured at Fair Value on Recurring Basis	The following tables provide a summary of the fair value measurements for each major category of assets and liabilities measured at fair value on a recurring basis and the location within the accompanying consolidated balance sheets at September 30, 2022 and December 31, 2021, respectively (amounts in thousands): Fair Value Measurements at Reporting Date Using Description Balance Sheet 9/30/2022 Quoted Prices in Significant Other Significant Assets Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps Other Assets $ 23,413 $ — $ 23,413 $ — Supplemental Executive Retirement Plan Other Assets 125,585 125,585 — — Total $ 148,998 $ 125,585 $ 23,413 $ — Liabilities Supplemental Executive Retirement Plan Other Liabilities $ 125,585 $ 125,585 $ — $ — Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Mezzanine $ 370,537 $ — $ 370,537 $ — Fair Value Measurements at Reporting Date Using Description Balance Sheet 12/31/2021 Quoted Prices in Significant Other Significant Assets Supplemental Executive Retirement Plan Other Assets $ 164,650 $ 164,650 $ — $ — Liabilities Supplemental Executive Retirement Plan Other Liabilities $ 164,650 $ 164,650 $ — $ — Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners Mezzanine $ 498,977 $ — $ 498,977 $ —
Summary of Effect of Cash Flow Hedges on the Accompanying Consolidated Statements of Operations and Comprehensive Income	The following tables provide a summary of the effect of cash flow hedges on the Company’s accompanying consolidated statements of operations and comprehensive income for the nine months ended September 30, 2022 and 2021, respectively (amounts in thousands): September 30, 2022 Amount of Location of Amount of Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps $ 23,413 Interest expense $ ( 9,987 ) Total $ 23,413 $ ( 9,987 ) September 30, 2021 Amount of Location of Amount of Derivatives designated as hedging instruments: Interest Rate Contracts: Forward Starting Swaps $ — Interest expense $ ( 7,000 ) Total $ — $ ( 7,000 )

Earnings Per Share and Earnin_2

Earnings Per Share and Earnings Per Unit (Tables)	9 Months Ended
	Sep. 30, 2022
Schedule of Calculation of Numerator and Denominator in Earnings Per Share and Earnings Per Unit	The following tables set forth the computation of net income per share – basic and net income per share – diluted for the Company (amounts in thousands except per share amounts): Nine Months Ended September 30, Quarter Ended September 30, 2022 2021 2022 2021 Numerator for net income per share – basic: Net income $ 641,641 $ 835,736 $ 335,165 $ 447,332 Allocation to Noncontrolling Interests – Operating Partnership ( 21,024 ) ( 27,903 ) ( 10,997 ) ( 14,847 ) Net (income) loss attributable to Noncontrolling ( 2,726 ) ( 1,957 ) ( 1,143 ) ( 534 ) Preferred distributions ( 2,318 ) ( 2,318 ) ( 773 ) ( 773 ) Numerator for net income per share – basic $ 615,573 $ 803,558 $ 322,252 $ 431,178 Numerator for net income per share – diluted: Net income $ 641,641 $ 835,736 $ 335,165 $ 447,332 Net (income) loss attributable to Noncontrolling ( 2,726 ) ( 1,957 ) ( 1,143 ) ( 534 ) Preferred distributions ( 2,318 ) ( 2,318 ) ( 773 ) ( 773 ) Numerator for net income per share – diluted $ 636,597 $ 831,461 $ 333,249 $ 446,025 Denominator for net income per share – basic and diluted: Denominator for net income per share – basic 375,710 373,474 375,850 374,308 Effect of dilutive securities: OP Units 11,893 12,367 11,895 12,019 Long-term compensation shares/units 1,785 1,801 1,555 2,047 ATM forward sales 6 — — — Denominator for net income per share – diluted 389,394 387,642 389,300 388,374 Net income per share – basic $ 1.64 $ 2.15 $ 0.86 $ 1.15 Net income per share – diluted $ 1.63 $ 2.14 $ 0.86 $ 1.15
ERPOP [Member]
Schedule of Calculation of Numerator and Denominator in Earnings Per Share and Earnings Per Unit	The following tables set forth the computation of net income per Unit – basic and net income per Unit – diluted for the Operating Partnership (amounts in thousands except per Unit amounts): Nine Months Ended September 30, Quarter Ended September 30, 2022 2021 2022 2021 Numerator for net income per Unit – basic and diluted: Net income $ 641,641 $ 835,736 $ 335,165 $ 447,332 Net (income) loss attributable to Noncontrolling ( 2,726 ) ( 1,957 ) ( 1,143 ) ( 534 ) Allocation to Preference Units ( 2,318 ) ( 2,318 ) ( 773 ) ( 773 ) Numerator for net income per Unit – basic and diluted $ 636,597 $ 831,461 $ 333,249 $ 446,025 Denominator for net income per Unit – basic and diluted: Denominator for net income per Unit – basic 387,603 385,841 387,745 386,327 Effect of dilutive securities: Dilution for Units issuable upon assumed exercise/vesting 1,785 1,801 1,555 2,047 ATM forward sales 6 — — — Denominator for net income per Unit – diluted 389,394 387,642 389,300 388,374 Net income per Unit – basic $ 1.64 $ 2.15 $ 0.86 $ 1.15 Net income per Unit – diluted $ 1.63 $ 2.14 $ 0.86 $ 1.15

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2022
Commitments And Contingencies Disclosure [Abstract]
Summary of Real Estate Development Commitments	The following table summarizes the gross remaining total project costs for the Company’s projects under development at September 30, 2022 (total project costs remaining in thousands): Projects Apartment Units Total Project Costs Remaining (1) Projects Under Development Consolidated 2 537 $ 171,301 Unconsolidated 6 1,982 402,321 Total Projects Under Development 8 2,519 $ 573,622 (1) The Company’s share of the $ 573.6 million in total project costs remaining approximates $ 158.8 million, with the balance funded by the Company’s joint venture partners (approximately $ 6.4 million) and/or applicable construction loans (approximately $ 408.4 million).

Reportable Segments (Tables)

Reportable Segments (Tables)	9 Months Ended
	Sep. 30, 2022
Segment Reporting [Abstract]
Schedule of Reconciliation of NOI from Rental Real Estate Specific to Continuing Operations	The following table presents a reconciliation of NOI from our rental real estate for the nine months and quarters ended September 30, 2022 and 2021, respectively (amounts in thousands): Nine Months Ended September 30, Quarter Ended September 30, 2022 2021 2022 2021 Rental income $ 2,035,477 $ 1,818,867 $ 695,099 $ 623,206 Property and maintenance expense ( 365,277 ) ( 341,261 ) ( 124,048 ) ( 116,461 ) Real estate taxes and insurance expense ( 302,899 ) ( 297,780 ) ( 100,361 ) ( 96,909 ) Total operating expenses ( 668,176 ) ( 639,041 ) ( 224,409 ) ( 213,370 ) Net operating income $ 1,367,301 $ 1,179,826 $ 470,690 $ 409,836
Schedule of NOI from Our Rental Real Estate for Each Segment Specific to Continuing Operations	The following tables present NOI from our rental real estate for each segment for the nine months and quarters ended September 30, 2022 and 2021, respectively, as well as total assets and capital expenditures at September 30, 2022 (amounts in thousands): Nine Months Ended September 30, 2022 Nine Months Ended September 30, 2021 Rental Operating NOI Rental Operating NOI Same store (1) Los Angeles $ 351,896 $ 103,121 $ 248,775 $ 316,206 $ 99,837 $ 216,369 Orange County 91,271 19,681 71,590 80,773 18,865 61,908 San Diego 64,540 14,574 49,966 58,210 13,892 44,318 Subtotal - Southern California 507,707 137,376 370,331 455,189 132,594 322,595 San Francisco 312,401 93,572 218,829 285,212 89,559 195,653 Washington, D.C. 306,161 102,564 203,597 290,255 97,407 192,848 New York 318,756 139,121 179,635 270,776 136,859 133,917 Seattle 210,011 59,222 150,789 190,386 61,092 129,294 Boston 194,640 60,003 134,637 173,953 57,478 116,475 Denver 32,505 9,129 23,376 28,732 8,482 20,250 Total same store 1,882,181 600,987 1,281,194 1,694,503 583,471 1,111,032 Non-same store/other Non-same store (2) 131,693 54,236 77,457 31,305 15,256 16,049 Other (3) 21,603 12,953 8,650 93,059 40,314 52,745 Total non-same store/other 153,296 67,189 86,107 124,364 55,570 68,794 Totals $ 2,035,477 $ 668,176 $ 1,367,301 $ 1,818,867 $ 639,041 $ 1,179,826 (1) For the nine months ended September 30, 2022 and 2021, same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2021, less properties subsequently sold, which represented 72,869 apartment units. (2) For the nine months ended September 30, 2022 and 2021, non-same store primarily includes properties acquired after January 1, 2021, plus any properties in lease-up and not stabilized as of January 1, 2021, and any properties undergoing major renovations. (3) Other includes development, other corporate operations and operations prior to disposition for properties sold. Quarter Ended September 30, 2022 Quarter Ended September 30, 2021 Rental Operating NOI Rental Operating NOI Same store (1) Los Angeles $ 119,269 $ 34,783 $ 84,486 $ 110,180 $ 33,568 $ 76,612 Orange County 31,252 6,875 24,377 28,263 6,455 21,808 San Diego 22,129 5,018 17,111 20,283 4,717 15,566 Subtotal - Southern California 172,650 46,676 125,974 158,726 44,740 113,986 San Francisco 106,382 31,984 74,398 96,451 30,173 66,278 Washington, D.C. 106,098 35,686 70,412 98,643 34,238 64,405 New York 112,595 46,194 66,401 93,454 45,282 48,172 Seattle 72,756 20,385 52,371 63,936 20,658 43,278 Boston 66,981 20,122 46,859 58,863 19,401 39,462 Denver 11,102 3,191 7,911 9,812 2,950 6,862 All Other Markets 2,148 794 1,354 1,933 697 1,236 Total same store 650,712 205,032 445,680 581,818 198,139 383,679 Non-same store/other Non-same store (2) 42,707 17,068 25,639 15,702 7,736 7,966 Other (3) 1,680 2,309 ( 629 ) 25,686 7,495 18,191 Total non-same store/other 44,387 19,377 25,010 41,388 15,231 26,157 Totals $ 695,099 $ 224,409 $ 470,690 $ 623,206 $ 213,370 $ 409,836 (1) For the quarters ended September 30, 2022 and 2021, same store primarily includes all properties acquired or completed that were stabilized prior to July 1, 2021, less properties subsequently sold, which represented 73,402 apartment units. (2) For the quarters ended September 30, 2022 and 2021, non-same store primarily includes properties acquired after July 1, 2021, plus any properties in lease-up and not stabilized as of July 1, 2021, and any properties undergoing major renovations. (3) Other includes development, other corporate operations and operations prior to disposition for properties sold. Nine Months Ended September 30, 2022 Total Assets Capital Expenditures Same store (1) Los Angeles $ 2,604,866 $ 21,459 Orange County 358,574 4,170 San Diego 227,344 4,206 Subtotal - Southern California 3,190,784 29,835 San Francisco 3,090,195 21,988 Washington, D.C. 3,057,549 22,596 New York 3,424,747 17,365 Seattle 2,089,219 16,569 Boston 1,692,529 16,349 Denver 477,354 939 Total same store 17,022,377 125,641 Non-same store/other Non-same store (2) 2,517,480 15,524 Other (3) 725,548 542 Total non-same store/other 3,243,028 16,066 Totals $ 20,265,405 $ 141,707 (1) Same store primarily includes all properties acquired or completed that were stabilized prior to January 1, 2021, less properties subsequently sold, which represented 72,869 apartment units. (2) Non-same store primarily includes properties acquired after January 1, 2021, plus any properties in lease-up and not stabilized as of January 1, 2021, and any properties undergoing major renovations. (3) Other includes development, other corporate operations and capital expenditures for properties sold.

Business - Additional Informati

Business - Additional Information (Details)	Sep. 30, 2022 ApartmentUnit State Property
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of states in which entity operates | State	10
Properties | Property	308
Apartment units | ApartmentUnit	79,594
ERPOP [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Noncontrolling interest, ownership percentage by parent	96.70%

Business - Ownership Breakdown

Business - Ownership Breakdown (Details)	Sep. 30, 2022 ApartmentUnit Property
Property/Unit schedule
Properties | Property	308
Apartment Units | ApartmentUnit	79,594
Wholly Owned Properties
Property/Unit schedule
Properties | Property	293
Apartment Units | ApartmentUnit	76,480
Partially Owned Properties - Consolidated
Property/Unit schedule
Properties | Property	15
Apartment Units | ApartmentUnit	3,114

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Provision for income tax	$ 152,000	$ 284,000	$ 725,000	$ 679,000
Federal [Member]
Provision for income tax			$ 0

Equity, Capital and Other Int_3

Equity, Capital and Other Interests - Changes in Company's Issued and Outstanding Common Shares and Units (Details) - shares	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Equity Capital And Other Interests [Abstract]
Common Stock, Shares, Outstanding	375,527,195	372,302,000
Common Shares Issued:
Conversion of OP Units	37,661	1,153,963
Exercise of share options	381,384	1,401,755
Employee Share Purchase Plan (ESPP)	49,662	59,297
Restricted share grants, net	173,351	85,573
Common Stock, Shares, Outstanding	376,169,253	375,002,588
Units
Total Units Outstanding	12,659,027	13,858,073
Restricted unit grants, net	223,242	155,638
Conversion of OP Units to Common Shares	(37,661)	(1,153,963)
Total Units Outstanding	12,844,608	12,859,748
Common Shares And Units Outstanding	389,013,861	387,862,336
Units Ownership Interest in Operating Partnership	3.30%	3.30%

Equity, Capital and Other Int_4

Equity, Capital and Other Interests - Changes in Operating Partnership's Issued and Outstanding General Partner Units and Limited Partner Units (Details) - shares	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
General and Limited Partner Units
Exercise of share options	381,384	1,401,755
Employee Share Purchase Plan (ESPP)	49,662	59,297
Restricted share grants, net	173,351	85,573
Restricted unit grants, net	223,242	155,638
Common Shares And Units Outstanding	389,013,861	387,862,336
Limited Partner Units
Total Units Outstanding	12,659,027	13,858,073
Restricted unit grants, net	223,242	155,638
Conversion of Limited Partner OP Units to EQR Common Shares	(37,661)	(1,153,963)
Total Units Outstanding	12,844,608	12,859,748
Units Ownership Interest in Operating Partnership	3.30%	3.30%
ERPOP [Member]
General and Limited Partner Units
Common Shares And Units Outstanding	388,186,222	386,160,073
Exercise of share options	381,384	1,401,755
Employee Share Purchase Plan (ESPP)	49,662	59,297
Restricted share grants, net	173,351	85,573
Restricted unit grants, net	223,242	155,638
Common Shares And Units Outstanding	389,013,861	387,862,336
Limited Partner Units
Total Units Outstanding	12,659,027	13,858,073
Restricted unit grants, net	223,242	155,638
Conversion of Limited Partner OP Units to EQR Common Shares	(37,661)	(1,153,963)
Total Units Outstanding	12,844,608	12,859,748
Units Ownership Interest in Operating Partnership	3.30%	3.30%

Equity, Capital and Other Int_5

Equity, Capital and Other Interests - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Equity Capital And Other Interests [Abstract]
Redeemable noncontrolling interests - operating partnership	$ 370,537	$ 498,977	$ 459,933	$ 338,951
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, par or stated value per share	$ 0.01	$ 0.01

Equity, Capital and Other Int_6

Equity, Capital and Other Interests - Changes in Redemption Value of Redeemable Noncontrolling Interests - Operating Partnership (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Class Of Stock [Line Items]
Redeemable Noncontrolling Interests - Operating Partnership Units	$ 498,977	$ 338,951
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership	(127,570)	119,237
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	(870)	(1,745)
Redeemable Noncontrolling Interests - Operating Partnership Units	370,537	459,933
E R P O P [Member]
Class Of Stock [Line Items]
Redeemable Noncontrolling Interests - Operating Partnership Units	498,977	338,951
Change in market value of Redeemable Noncontrolling Interests - Operating Partnership	(127,570)	119,237
Change in carrying value of Redeemable Noncontrolling Interests - Operating Partnership	(870)	1,745
Redeemable Noncontrolling Interests - Operating Partnership Units	$ 370,537	$ 459,933

Equity, Capital and Other Int_7

Equity, Capital and Other Interests - Changes in Redemption Value of Redeemable Limited Partners Interest (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Class Of Stock [Line Items]
Redeemable Limited Partners	$ 498,977	$ 338,951
Limited Partners Change In Redemption Value	(127,570)	119,237
Limited Partners Change In Carrying Value	(870)	(1,745)
Redeemable Limited Partners	370,537	459,933
E R P O P [Member]
Class Of Stock [Line Items]
Redeemable Limited Partners	498,977	338,951
Limited Partners Change In Redemption Value	(127,570)	119,237
Limited Partners Change In Carrying Value	(870)	1,745
Redeemable Limited Partners	$ 370,537	$ 459,933

Equity, Capital and Other Int_8

Equity, Capital and Other Interests - Issued and Outstanding Preferred Shares and Preference Units (Details) - Preferred Stock - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Class Of Stock [Line Items]
Preferred Stocks Preference Units Call Date	Dec. 10, 2026
Annual Dividend Per Preferred Share Preference Unit	$ 4.145
8.29% Series K Cumulative Redeemable Preferred Shares/Preference Units; liquidation value $50 per share/unit; 745,600 shares/units issued and outstanding as of June 30, 2022 and December 31, 2021	$ 37,280	$ 37,280
E R P O P [Member]
Class Of Stock [Line Items]
Preferred Stocks Preference Units Call Date	Dec. 10, 2026
Annual Dividend Per Preferred Share Preference Unit	$ 4.145
8.29% Series K Cumulative Redeemable Preferred Shares/Preference Units; liquidation value $50 per share/unit; 745,600 shares/units issued and outstanding as of June 30, 2022 and December 31, 2021	$ 37,280	$ 37,280

Equity, Capital and Other Int_9

Equity, Capital and Other Interests - Issued and Outstanding Preferred Shares and Preference Units (Parenthetical) (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Class Of Stock [Line Items]
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	100,000,000	100,000,000
Preferred Stock
Class Of Stock [Line Items]
Preferred Stock Preference Units Issued	745,600	745,600
Preferred Stock Preference Units Outstanding	745,600	745,600
Preferred Stock Preference Units Redemption Price Per Share	$ 50	$ 50
Preferred Stock Preference Units Dividend Rate Percentage	8.29%	8.29%

Equity, Capital and Other In_10

Equity, Capital and Other Interests - Other - Additional Information (Details) - $ / shares	104 Months Ended	177 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Common Stock, Shares, Issued	376,169,253	376,169,253	375,527,195
Stock repurchase program, number of shares authorized to be repurchased	13,000,000	13,000,000
Stock open market repurchased and retired during period, shares	0	0
Stock repurchase program, remaining number of shares authorized to be repurchased	13,000,000	13,000,000
ATM Share Offering [Member] | New Program [Member]
Common shares available for issuance	13,000,000	13,000,000
Forward Sales Agreements [Member]
Settlement of shares under forward sales agreement	0	0
Forward Sales Agreements [Member] | ATM Share Offering [Member]
Weighted average initial forward price per share	$ 83.25	$ 83.25
Forward Sales Agreements [Member] | ATM Share Offering [Member] | Prior Program [Member]
Common Stock, Shares, Issued	1,700,000	1,700,000

Real Estate - Summary of Carryi

Real Estate - Summary of Carrying Amounts of Investment in Real Estate (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Land	$ 5,580,878	$ 5,814,790
Depreciable property:
Buildings and improvements	19,445,470	19,632,284
Furniture, fixtures and equipment	2,295,387	2,220,203
In-Place lease intangibles	510,816	518,324
Projects under development:
Projects under development	89,347	24,307
Land held for development:
Land held for development	60,165	62,998
Investment in real estate	27,982,063	28,272,906
Accumulated depreciation	(8,813,578)	(8,354,282)
Investment in real estate, net	19,168,485	19,918,624
Land [Member]
Projects under development:
Projects under development	3,201
Land held for development:
Land held for development	46,160	46,160
Construction-in-progress [Member]
Projects under development:
Projects under development	86,146	24,307
Land held for development:
Land held for development	$ 14,005	$ 16,838

Real Estate - Acquired Properti

Real Estate - Acquired Properties From Unaffiliated Parties (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) ApartmentUnit Property
Properties acquired | Property	1
Property Units acquired | ApartmentUnit	172
Purchase Price | $	$ 113,000
Rental Properties - Consolidated [Member]
Properties acquired | Property	1
Property Units acquired | ApartmentUnit	172
Purchase Price | $	$ 113,000

Real Estate - Acquired Proper_2

Real Estate - Acquired Properties From Unaffiliated Parties (Parenthetical) (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Purchase price	$ 113,000
Land [Member]
Purchase price	25,300
Depreciable Property [Member]
Purchase price	$ 87,700

Real Estate - Disposed Properti

Real Estate - Disposed Properties to Unaffiliated Parties (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) ApartmentUnit Property
Properties disposed | Property	3
Property Units disposed | ApartmentUnit	945
Sales Price | $	$ 746,150
Rental Properties - Consolidated [Member]
Properties disposed | Property	3
Property Units disposed | ApartmentUnit	945
Sales Price | $	$ 746,150

Real Estate - Additional Inform

Real Estate - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Real Estate [Abstract]
Net gain (loss) on sales of real estate properties	$ 196,551	$ 363,928	$ 304,346	$ 587,623

Commitments to Acquire_Dispos_3

Commitments to Acquire/Dispose of Real Estate - Summary of Separate Agreements to Dispose (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Property/Unit schedule
Sales Price	$ 5,500
Net Book Value at September 30, 2022	3,930
Land [Member]
Property/Unit schedule
Sales Price	5,500
Net Book Value at September 30, 2022	$ 3,930

Investments in Partially Owne_3

Investments in Partially Owned Entities - Summary of Company's Consolidated Joint Ventures (Details)	Sep. 30, 2022 Property ApartmentUnit Project
Variable Interest Entity [Line Items]
Properties | Property	308
Apartment units	79,594
Consolidated VIE [Member] | Operating Properties [Member]
Variable Interest Entity [Line Items]
Properties | Property	15
Apartment units	3,114
Consolidated VIE [Member] | Project Under Development [Member]
Variable Interest Entity [Line Items]
Apartment units	312
Project | Project	1

Investments in Partially Owne_4

Investments in Partially Owned Entities - Summary of Company's Consolidated Joint Ventures (Parenthetical) (Details)	9 Months Ended
	Sep. 30, 2022 USD ($) ApartmentUnit
Variable Interest Entity [Line Items]
Property Units acquired | ApartmentUnit	172
Consolidated VIE [Member]
Variable Interest Entity [Line Items]
Percentage interest in consolidated operating property	25%
Property Units acquired | ApartmentUnit	432
Payments to acquired interest in consolidated operating property	$ 32,200,000
Consolidated VIE [Member] | Noncontrolling Interests [Member]
Variable Interest Entity [Line Items]
Payments to acquired interest in consolidated operating property	4,800,000
Partially owned property reduced amount	0
Consolidated VIE [Member] | Paid in Capital/General Partner Capital [Member]
Variable Interest Entity [Line Items]
Payments to acquired interest in consolidated operating property	$ 27,400,000

Investments in Partially Owne_5

Investments in Partially Owned Entities - Summary of Consolidated Assets and Liabilities Related to the VIEs (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Consolidated Assets	$ 20,265,405	$ 21,169,241
Consolidated Liabilities	8,633,131	9,483,056
Consolidated VIE [Member]
Variable Interest Entity [Line Items]
Consolidated Assets	675,974	912,955
Consolidated Liabilities	$ 148,071	$ 251,424

Investments in Partially Owne_6

Investments in Partially Owned Entities - Summary of Variable Rate Construction Mortgage Debt (Details) - Consolidated VIE [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) JointVenture
Recently Completed Operating Property [Member]
Variable Interest Entity [Line Items]
Number of joint ventures with debt financing | JointVenture	1
Aggregate loan commitments	$ 67,589
Amounts borrowed under loan commitments	$ 64,816
Maturity dates	2023
Project Under Development [Member]
Variable Interest Entity [Line Items]
Number of joint ventures with debt financing | JointVenture	1
Aggregate loan commitments	$ 73,344
Amounts borrowed under loan commitments	$ 34,356
Maturity dates	2025

Investments in Partially Owne_7

Investments in Partially Owned Entities - Summary of Company's Investment in Unconsolidated Entities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ 256,311	$ 127,448
Various Real Estate Holdings [Member] | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	36,372	36,024
Project under Development and Land Held for Development
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ 195,974	72,488
Project under Development and Land Held for Development | Variable Interest Entity, Not Primary Beneficiary | Minimum [Member]
Variable Interest Entity [Line Items]
Ownership Percentage	62%
Project under Development and Land Held for Development | Variable Interest Entity, Not Primary Beneficiary | Maximum [Member]
Variable Interest Entity [Line Items]
Ownership Percentage	95%
Real Estate Technology Funds/Companies | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ 24,206	19,347
Other [Member]
Variable Interest Entity [Line Items]
Investments in Unconsolidated Entities	$ (241)	$ (411)

Investments in Partially Owne_8

Investments in Partially Owned Entities - Summary of Company's Unconsolidated Joint Ventures Deemed to be VIEs (Details)	Sep. 30, 2022 Project ApartmentUnit Entity
Variable Interest Entity [Line Items]
Apartment units	79,594
Variable Interest Entity, Not Primary Beneficiary | Real Estate Holdings [Member]
Variable Interest Entity [Line Items]
Entities | Entity	2
Variable Interest Entity, Not Primary Beneficiary | Projects Under Development [Member]
Variable Interest Entity [Line Items]
Project | Project	6
Apartment units	1,982
Variable Interest Entity, Not Primary Beneficiary | Land Held For Development [Member]
Variable Interest Entity [Line Items]
Project | Project	2
Apartment units	745

Investments in Partially Owne_9

Investments in Partially Owned Entities - Summary of Information on Total Unconsolidated Development Joint Ventures (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) JointVenture Apartment	Sep. 30, 2021 USD ($)
Variable Interest Entity [Line Items]
Investments in unconsolidated entities - acquisitions	$ 49,330	$ 21,787
Unconsolidated VIE [Member]
Variable Interest Entity [Line Items]
Number of unconsolidated joint ventures | JointVenture	2
Apartment units | Apartment	797
Unconsolidated VIE [Member] | Equity Residential [Member]
Variable Interest Entity [Line Items]
Investments in unconsolidated entities - acquisitions	$ 49,330

Restricted Deposits - Restricte

Restricted Deposits - Restricted Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Mortgage escrow deposits:
Replacement reserves	$ 12,213	$ 11,156
Mortgage principal reserves/sinking funds	23,484	19,104
Mortgage escrow deposits	35,697	30,260
Restricted cash:
Tax-deferred (1031) exchange proceeds		166,362
Earnest money on pending acquisitions		2,000
Restricted deposits on real estate investments	235	284
Resident security and utility deposits	38,458	35,663
Other	2,289	1,835
Restricted cash	40,982	206,144
Restricted deposits	$ 76,679	$ 236,404	$ 187,042

Leases - Additional Information

Leases - Additional Information (Details)	Sep. 30, 2022
Residential Apartment Leases [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Retail leases term	12 months
Non-residential Leases [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Retail leases term	10 years
Non-residential Leases [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Retail leases term	5 years

Leases - Summary of Lease Incom

Leases - Summary of Lease Income Types Relating to Lease Payments Along With the Total Other Rental Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating Leased Assets [Line Items]
Total lease revenue	$ 664,996	$ 596,824	$ 1,949,913	$ 1,745,648
Rental income	695,099	623,206	2,035,477	1,818,867
Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	648,836	580,313	1,901,284	1,696,070
Non-residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	16,160	16,511	48,629	49,578
Residential and Non-Residential Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	637,064	565,917	1,861,207	1,675,458
Residential and Non-Residential Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	620,880	551,474	1,812,928	1,629,778
Residential and Non-Residential Rent [Member] | Non-residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	16,184	14,443	48,279	45,680
Utility Recoveries (RUBS Income) [Member]
Operating Leased Assets [Line Items]
Total lease revenue	20,470	18,987	60,422	55,850
Utility Recoveries (RUBS Income) [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	20,243	18,798	59,826	55,331
Utility Recoveries (RUBS Income) [Member] | Non-residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	227	189	596	519
Parking Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	10,960	10,616	32,868	30,868
Parking Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	10,840	10,513	32,546	30,403
Parking Rent [Member] | Non-residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	120	103	322	465
Other Lease Revenue [Member]
Operating Leased Assets [Line Items]
Total lease revenue	(3,498)	1,304	(4,584)	(16,528)
Other Lease Revenue [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	(3,127)	(472)	(4,016)	(19,442)
Other Lease Revenue [Member] | Non-residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	(371)	1,776	(568)	2,914
Parking Revenue
Operating Leased Assets [Line Items]
Rental income	9,270	6,883	27,701	18,455
Other Revenue
Operating Leased Assets [Line Items]
Rental income	20,833	19,499	57,863	54,764
Other Rental Income [Member]
Operating Leased Assets [Line Items]
Rental income	$ 30,103	$ 26,382	$ 85,564	$ 73,219

Leases - Summary of Residential

Leases - Summary of Residential and Non-Residential Accounts Receivable and Straight-Line Receivable Balances (Details) - Other Assets [Member] - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Residential Leases [Member]
Operating Leased Assets [Line Items]
Resident/tenant accounts receivable balances	$ 34,939	$ 37,959
Allowance for doubtful accounts	(30,543)	(33,121)
Net receivable balances	4,396	4,838
Straight-line receivable balances	3,466	7,460
Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Resident/tenant accounts receivable balances	3,951	3,218
Allowance for doubtful accounts	(2,767)	(2,365)
Net receivable balances	1,184	853
Straight-line receivable balances	$ 13,792	$ 13,021

Leases - Summary of Residenti_2

Leases - Summary of Residential and Non-Residential Accounts Receivable and Straight-Line Receivable Balances (Parenthetical) (Details)	Sep. 30, 2022
Leases [Abstract]
Holding percentage of residential security deposits of net receivable	53.90%

Leases - Summary of Residenti_3

Leases - Summary of Residential Bad Debt for Company's Properties (Details) - Residential Leases [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Lessor Lease Description [Line Items]
Bad debt, net	$ 6,707	$ 3,979	$ 14,854	$ 29,751
% of rental income	1%	0.70%	0.80%	1.70%

Leases - Summary of Residenti_4

Leases - Summary of Residential Bad Debt for Company's Properties (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Leases [Abstract]
Bad debt, net from resident payments	$ 8	$ 13.5	$ 32.5	$ 18.5

Debt - Mortgage Notes Payable -

Debt - Mortgage Notes Payable - Summary of Mortgage Notes Payable Activity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	$ 2,191,201
Proceeds	37,429	$ 51,298
Lump sum payoffs	(260,874)	(59,880)
Scheduled principal repayments	(3,186)
Amortization of premiums/ discounts	1,865	$ 2,069
Amortization of deferred financing costs, net	1,392
Mortgage notes payable, net ending balance	1,967,827
Fixed Rate Debt [Member] | Secured - Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	1,896,472
Lump sum payoffs	(260,874)
Scheduled principal repayments	(3,147)
Amortization of premiums/ discounts	935
Amortization of deferred financing costs, net	956
Mortgage notes payable, net ending balance	1,634,342
Floating Rate Debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	294,729
Proceeds	37,429
Scheduled principal repayments	(39)
Amortization of premiums/ discounts	930
Amortization of deferred financing costs, net	436
Mortgage notes payable, net ending balance	333,485
Floating Rate Debt [Member] | Secured - Conventional [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	59,890
Proceeds	37,429
Scheduled principal repayments	(39)
Amortization of deferred financing costs, net	331
Mortgage notes payable, net ending balance	97,611
Floating Rate Debt [Member] | Secured - Tax Exempt [Member]
Debt Instrument [Line Items]
Mortgage notes payable, net beginning balance	234,839
Amortization of premiums/ discounts	930
Amortization of deferred financing costs, net	105
Mortgage notes payable, net ending balance	$ 235,874

Debt - Mortgage Notes Payable_2

Debt - Mortgage Notes Payable - Summary of Certain Interest Rate and Maturity Date Information (Details) - Mortgages [Member]	9 Months Ended
	Sep. 30, 2022
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.39%
Maturity Date Ranges, Start	2023
Maturity Date Ranges, End	2061
Minimum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	0.10%
Maximum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	4.21%

Debt - Mortgage Notes Payable_3

Debt - Mortgage Notes Payable - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Mortgage notes payable	$ 1,967,827	$ 2,191,201
Credit Enhanced Debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable	$ 250,000

Debt - Notes - Summary of Notes

Debt - Notes - Summary of Notes Activity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Notes, net beginning balance	$ 5,835,222
Proceeds		$ 497,470
Lump sum payoffs	(500,000)
Amortization of premiums/ discounts	2,258	$ 1,865
Notes, net ending balance	5,340,807
Fixed Rate Debt [Member] | Unsecured - Public [Member]
Debt Instrument [Line Items]
Notes, net beginning balance	5,835,222
Lump sum payoffs	(500,000)
Amortization of premiums/ discounts	2,258
Amortization of deferred financing costs, net	3,327
Notes, net ending balance	$ 5,340,807

Debt - Notes - Summary of Certa

Debt - Notes - Summary of Certain Interest Rate and Maturity Date Information (Details) - Notes [Member]	9 Months Ended
	Sep. 30, 2022
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.65%
Maturity Date Ranges, Start	2025
Maturity Date Ranges, End	2047
Minimum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	1.85%
Maximum [Member]
Debt Instrument [Line Items]
Interest Rate Ranges	7.57%

Debt - Line of Credit and Comme

Debt - Line of Credit and Commercial Paper - Additional Information (Details)	9 Months Ended
	Sep. 30, 2022 USD ($)
Line of Credit Facility [Line Items]
Debt instrument, maturity date	Nov. 01, 2024
Commercial paper balance outstanding	$ 1,000,000,000
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Weighted average interest rates	1.18%
Commercial paper weighted average days outstanding	28 days
Weighted average amount outstanding	$ 177,900,000
Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit facility	2,500,000,000
Ability to increase LOC facility	$ 750,000,000
Debt instrument, basis spread on variable rate	0.775%
Percentage points of line of credit facility commitment fee	0.125%
Revolving credit facility	$ 0
Commercial paper balance outstanding	$ 190,000,000

Debt - Line of Credit and Com_2

Debt - Line of Credit and Commercial Paper - Schedule of Unsecured Revolving Credit Facility (Details)	9 Months Ended
	Sep. 30, 2022 USD ($)
Line of Credit Facility [Line Items]
Commercial paper balance outstanding	$ (1,000,000,000)
Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit facility commitment	2,500,000,000
Commercial paper balance outstanding	(190,000,000)
Unsecured revolving credit facility balance outstanding	0
Other restricted amounts	(3,463,000)
Unsecured revolving credit facility availability	$ 2,306,537,000

Debt - Other - Summary of Debt

Debt - Other - Summary of Debt Extinguishment Costs Recorded as Additional Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Debt Disclosure [Abstract]
Write-offs of unamortized deferred financing costs	$ 277	$ 369	$ 264
Write-offs of unamortized (premiums)/discounts/OCI	3,570	3,947
Total	$ 3,847	$ 4,316	$ 264

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Valuations for Each Type of Fair Value Measurement (Details)	9 Months Ended
	Sep. 30, 2022
Employee Holdings Within The Supplemental Executive Retirement Plan
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Type	Employee holdings (other than Common Shares) within the supplemental executive retirement plan (the “SERP”)
Valuation Inputs	Quoted market prices for identical assets. These holdings are included in other assets and other liabilities on the consolidated balance sheets.
Redeemable Noncontrolling Interests Operating Partnership Redeemable Limited Partners
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Type	Redeemable Noncontrolling Interests – Operating Partnership/Redeemable Limited Partners
Valuation Inputs	Quoted market price of Common Shares.
Mortgage Notes Payable And Private Unsecured Debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Type	Mortgage notes payable and private unsecured debt (including its commercial paper and line of credit, if applicable)
Valuation Inputs	Indicative rates provided by lenders of similar loans.
Public Unsecured Notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Type	Public unsecured notes
Valuation Inputs	Quoted market prices for each underlying issuance.

Fair Value Measurements - Sum_2

Fair Value Measurements - Summary of Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	$ 7,498,191	$ 8,341,453
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	6,705,282	8,991,998
Mortgage Notes Payable, Net [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	1,967,827	2,191,201
Mortgage Notes Payable, Net [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	1,811,596	2,193,689
Unsecured Debt [Member] | Carrying Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	5,530,364	6,150,252
Unsecured Debt [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total debt, net	$ 4,893,686	$ 6,798,309

Fair Value Measurements - Sum_3

Fair Value Measurements - Summarizes Company's Consolidated Derivative Instruments (Details) - Forward Starting Swaps [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Derivatives Fair Value [Line Items]
Current Notional Balance	$ 350,000
Maturity Date	2033
Minimum [Member]
Derivatives Fair Value [Line Items]
Interest Rate	2.447%
Maximum [Member]
Derivatives Fair Value [Line Items]
Interest Rate	2.972%

Fair Value Measurements - Sum_4

Fair Value Measurements - Summary of Fair Value Measurements for Each Major Category of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Derivatives Fair Value [Line Items]
Fair Value Of SERP Investments	$ 125,585	$ 164,650
Derivative Asset, Total	148,998
Other Liabilities, Fair Value Disclosure	125,585	164,650
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	370,537	498,977	$ 459,933	$ 338,951
Forward Starting Swaps [Member]
Derivatives Fair Value [Line Items]
Other Assets, Fair Value Disclosure	23,413
Fair Value, Inputs, Level 1 [Member]
Derivatives Fair Value [Line Items]
Fair Value Of SERP Investments	125,585	164,650
Derivative Asset, Total	125,585
Other Liabilities, Fair Value Disclosure	125,585	164,650
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	0	0
Fair Value, Inputs, Level 1 [Member] | Forward Starting Swaps [Member]
Derivatives Fair Value [Line Items]
Other Assets, Fair Value Disclosure	0
Fair Value, Inputs, Level 2 [Member]
Derivatives Fair Value [Line Items]
Fair Value Of SERP Investments	0	0
Derivative Asset, Total	23,413
Other Liabilities, Fair Value Disclosure	0	0
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	370,537	498,977
Fair Value, Inputs, Level 2 [Member] | Forward Starting Swaps [Member]
Derivatives Fair Value [Line Items]
Other Assets, Fair Value Disclosure	23,413
Fair Value, Inputs, Level 3 [Member]
Derivatives Fair Value [Line Items]
Fair Value Of SERP Investments	0	0
Derivative Asset, Total	0
Other Liabilities, Fair Value Disclosure	0	0
Redeemable Noncontrolling Interests - Operating Partnership/Redeemable Limited Partners	0	$ 0
Fair Value, Inputs, Level 3 [Member] | Forward Starting Swaps [Member]
Derivatives Fair Value [Line Items]
Other Assets, Fair Value Disclosure	$ 0

Fair Value Measurements - Sum_5

Fair Value Measurements - Summary of Effect of Cash Flow Hedges on the Accompanying Consolidated Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in OCI on Derivative	$ 23,413	$ 0
Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income	(9,987)	(7,000)
Forward Starting Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in OCI on Derivative	23,413	0
Amount of Gain/(Loss) Reclassified from Accumulated OCI into Income	$ (9,987)	$ (7,000)

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Derivative Instrument Detail [Abstract]
Unrealized gain (loss) on interest rate cash flow hedges, pretax, accumulated other comprehensive income (loss)	$ 0.9	$ 34.3
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	$ 3.8

Earnings Per Share and Earnin_3

Earnings Per Share and Earnings Per Unit - Computation of Net Income per Share Basic and Net Income per Share Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 335,165	$ 447,332	$ 641,641	$ 835,736
Allocation to Noncontrolling Interests – Operating Partnership	(10,997)	(14,847)	(21,024)	(27,903)
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	(1,143)	(534)	(2,726)	(1,957)
Preferred distributions	(773)	(773)	(2,318)	(2,318)
Net income available to Common Shares	322,252	431,178	615,573	803,558
Numerator for net income per share – diluted	$ 333,249	$ 446,025	$ 636,597	$ 831,461
Weighted average Common Shares outstanding	375,850	374,308	375,710	373,474
OP Units	11,895	12,019	11,893	12,367
Dilutive Securities Options	1,555	2,047	1,785	1,801
ATM forward sales			6
Denominator for net income per share – diluted	389,300	388,374	389,394	387,642
Net income per share - basic	$ 0.86	$ 1.15	$ 1.64	$ 2.15
Net income per share - diluted	$ 0.86	$ 1.15	$ 1.63	$ 2.14

Earnings Per Share and Earnin_4

Earnings Per Share and Earnings Per Unit - Computation of Net Income per Unit Basic and Net Income per Unit Diluted for Operating Partnership (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net income	$ 335,165	$ 447,332	$ 641,641	$ 835,736
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	$ (1,143)	$ (534)	$ (2,726)	$ (1,957)
Dilutive Securities Options	1,555	2,047	1,785	1,801
ATM forward sales			6
Denominator for net income per share – diluted	389,300	388,374	389,394	387,642
Net income per share - basic	$ 0.86	$ 1.15	$ 1.64	$ 2.15
Net income per share - diluted	$ 0.86	$ 1.15	$ 1.63	$ 2.14
ERPOP [Member]
Net income	$ 335,165	$ 447,332	$ 641,641	$ 835,736
Net (income) loss attributable to Noncontrolling Interests – Partially Owned Properties	(1,143)	(534)	(2,726)	(1,957)
Allocation to Preference Units	(773)	(773)	(2,318)	(2,318)
Numerator for net income per Unit – basic and diluted	$ 333,249	$ 446,025	$ 636,597	$ 831,461
Denominator for net income per Unit – basic	387,745	386,327	387,603	385,841
Dilutive Securities Options	1,555	2,047	1,785	1,801
ATM forward sales		0	6	0
Denominator for net income per share – diluted	389,300	388,374	389,394	387,642
Net income per share - basic	$ 0.86	$ 1.15	$ 1.64	$ 2.15
Net income per share - diluted	$ 0.86	$ 1.15	$ 1.63	$ 2.14

Commitments and Contingencies -

Commitments and Contingencies - Summary of Real Estate Development Commitments (Details) $ in Thousands	Sep. 30, 2022 USD ($) Project Apartment
Projects Under Development Consolidated [Member]
Projects/Investments/Units/Remaining Commitments schedule
Number of consolidated apartment units in various stages of development | Apartment	537
Consolidated project under development commitment fund | $	$ 171,301
Number of consolidated projects in various stages of development | Project	2
Projects Under Development Unconsolidated [Member]
Projects/Investments/Units/Remaining Commitments schedule
Number of unconsolidated apartment units in various stages of development | Apartment	1,982
Unconsolidated project under development commitment fund | $	$ 402,321
Number of unconsolidated projects in various stages of development | Project	6
Projects Under Development [Member]
Projects/Investments/Units/Remaining Commitments schedule
Apartment Units | Apartment	2,519
Project under development commitment fund | $	$ 573,622
Number of projects in various stages of development | Project	8

Commitments and Contingencies_2

Commitments and Contingencies - Summary of Real Estate Development Commitments (Parenthetical) (Details) $ in Millions	Sep. 30, 2022 USD ($)
Projects/Investments/Units/Remaining Commitments schedule
Total project costs remaining under development commitment fund	$ 573.6
Parent
Projects/Investments/Units/Remaining Commitments schedule
Total project costs remaining under development commitment fund	158.8
Corporate Joint Venture
Projects/Investments/Units/Remaining Commitments schedule
Total project costs remaining under development commitment fund	6.4
Construction Loans
Projects/Investments/Units/Remaining Commitments schedule
Total project costs remaining under development commitment fund	$ 408.4

Commitments and Contingencies_3

Commitments and Contingencies - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) Investment
Commitments And Contingencies [Abstract]
Number of real estate technology investment funds	8
Number of other real estate investment funds	1
Real estate technology and other real estate investments commitment funds | $	$ 22.1

Reportable Segments - Additiona

Reportable Segments - Additional Information (Details) - Customer	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Number of customers contributed 10% or more of total revenue	0	0	0	0
Non-residential Leases [Member] | Revenue [Member] | Revenue Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage			3.70%

Reportable Segments - Reconcili

Reportable Segments - Reconciliation of NOI from Rental Real Estate Specific to Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Rental income	$ 695,099	$ 623,206	$ 2,035,477	$ 1,818,867
Property and maintenance expense	(124,048)	(116,461)	(365,277)	(341,261)
Real estate taxes and insurance expense	(100,361)	(96,909)	(302,899)	(297,780)
Operating income	414,011	521,554	873,683	1,033,958
Same Store, Non-same Store and Other
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Rental income	695,099	623,206	2,035,477	1,818,867
Property and maintenance expense	(124,048)	(116,461)	(365,277)	(341,261)
Real estate taxes and insurance expense	(100,361)	(96,909)	(302,899)	(297,780)
Total operating expenses	(224,409)	(213,370)	(668,176)	(639,041)
Operating income	$ 470,690	$ 409,836	$ 1,367,301	$ 1,179,826

Reportable Segments - NOI from

Reportable Segments - NOI from Our Rental Real Estate for Each Segment Specific to Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Rental income	$ 695,099	$ 623,206	$ 2,035,477	$ 1,818,867
Operating income	414,011	521,554	873,683	1,033,958
Total Assets	20,265,405		20,265,405		$ 21,169,241
Same Store
Segment Reporting Information [Line Items]
Rental income	650,712	581,818	1,882,181	1,694,503
Operating expenses	205,032	198,139	600,987	583,471
Operating income	445,680	383,679	1,281,194	1,111,032
Total Assets	17,022,377		17,022,377
Capital Expenditures			125,641
Non-same store/other
Segment Reporting Information [Line Items]
Rental income	44,387	41,388	153,296	124,364
Operating expenses	19,377	15,231	67,189	55,570
Operating income	25,010	26,157	86,107	68,794
Total Assets	3,243,028		3,243,028
Capital Expenditures			16,066
Same Store, Non-same Store and Other
Segment Reporting Information [Line Items]
Rental income	695,099	623,206	2,035,477	1,818,867
Operating expenses	224,409	213,370	668,176	639,041
Operating income	470,690	409,836	1,367,301	1,179,826
Total Assets	20,265,405		20,265,405
Capital Expenditures			141,707
Los Angeles | Same Store
Segment Reporting Information [Line Items]
Rental income	119,269	110,180	351,896	316,206
Operating expenses	34,783	33,568	103,121	99,837
Operating income	84,486	76,612	248,775	216,369
Total Assets	2,604,866		2,604,866
Capital Expenditures			21,459
Orange County | Same Store
Segment Reporting Information [Line Items]
Rental income	31,252	28,263	91,271	80,773
Operating expenses	6,875	6,455	19,681	18,865
Operating income	24,377	21,808	71,590	61,908
Total Assets	358,574		358,574
Capital Expenditures			4,170
San Diego | Same Store
Segment Reporting Information [Line Items]
Rental income	22,129	20,283	64,540	58,210
Operating expenses	5,018	4,717	14,574	13,892
Operating income	17,111	15,566	49,966	44,318
Total Assets	227,344		227,344
Capital Expenditures			4,206
Subtotal - Southern California | Same Store
Segment Reporting Information [Line Items]
Rental income	172,650	158,726	507,707	455,189
Operating expenses	46,676	44,740	137,376	132,594
Operating income	125,974	113,986	370,331	322,595
Total Assets	3,190,784		3,190,784
Capital Expenditures			29,835
San Francisco | Same Store
Segment Reporting Information [Line Items]
Rental income	106,382	96,451	312,401	285,212
Operating expenses	31,984	30,173	93,572	89,559
Operating income	74,398	66,278	218,829	195,653
Total Assets	3,090,195		3,090,195
Capital Expenditures			21,988
Washington D.C. | Same Store
Segment Reporting Information [Line Items]
Rental income	106,098	98,643	306,161	290,255
Operating expenses	35,686	34,238	102,564	97,407
Operating income	70,412	64,405	203,597	192,848
Total Assets	3,057,549		3,057,549
Capital Expenditures			22,596
New York | Same Store
Segment Reporting Information [Line Items]
Rental income	112,595	93,454	318,756	270,776
Operating expenses	46,194	45,282	139,121	136,859
Operating income	66,401	48,172	179,635	133,917
Total Assets	3,424,747		3,424,747
Capital Expenditures			17,365
Seattle | Same Store
Segment Reporting Information [Line Items]
Rental income	72,756	63,936	210,011	190,386
Operating expenses	20,385	20,658	59,222	61,092
Operating income	52,371	43,278	150,789	129,294
Total Assets	2,089,219		2,089,219
Capital Expenditures			16,569
Boston | Same Store
Segment Reporting Information [Line Items]
Rental income	66,981	58,863	194,640	173,953
Operating expenses	20,122	19,401	60,003	57,478
Operating income	46,859	39,462	134,637	116,475
Total Assets	1,692,529		1,692,529
Capital Expenditures			16,349
Denver | Same Store
Segment Reporting Information [Line Items]
Rental income	11,102	9,812	32,505	28,732
Operating expenses	3,191	2,950	9,129	8,482
Operating income	7,911	6,862	23,376	20,250
Total Assets	477,354		477,354
Capital Expenditures			939
All Other Markets | Same Store
Segment Reporting Information [Line Items]
Rental income	2,148	1,933
Operating expenses	794	697
Operating income	1,354	1,236
Non-same store | Non-same store/other
Segment Reporting Information [Line Items]
Rental income	42,707	15,702	131,693	31,305
Operating expenses	17,068	7,736	54,236	15,256
Operating income	25,639	7,966	77,457	16,049
Total Assets	2,517,480		2,517,480
Capital Expenditures			15,524
Other | Non-same store/other
Segment Reporting Information [Line Items]
Rental income	1,680	25,686	21,603	93,059
Operating expenses	2,309	7,495	12,953	40,314
Operating income	(629)	$ 18,191	8,650	$ 52,745
Total Assets	$ 725,548		725,548
Capital Expenditures			$ 542

Reportable Segments - NOI fro_2

Reportable Segments - NOI from Our Rental Real Estate for Each Segment Specific to Continuing Operations (Parenthetical) (Details) - Property	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Disclosure Of Entitys Reportable Segments [Abstract]
Units in same store properties	73,402	73,402	72,869	72,869

Subsequent Events - Additional

Subsequent Events - Additional Information (Details) - USD ($)		9 Months Ended
	Oct. 01, 2022	Sep. 30, 2022	Dec. 31, 2021
Subsequent Event [Line Items]
Common Stock, Shares, Issued		376,169,253	375,527,195
Debt instrument, maturity date		Nov. 01, 2024
Unsecured Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Unsecured revolving credit facility		$ 2,500,000,000
ATM Share Offering [Member] | Forward Sales Agreements [Member]
Subsequent Event [Line Items]
Weighted average initial forward price per share		$ 83.25
ATM Share Offering [Member] | Forward Sales Agreements [Member] | Prior Program [Member]
Subsequent Event [Line Items]
Common Stock, Shares, Issued		1,700,000
Subsequent Events [Member]
Subsequent Event [Line Items]
Forward starting swaps to hedge changes in interest rates	$ 50,000,000
Unsecured revolving credit facility	$ 2,500,000,000
Debt instrument, maturity date	Oct. 26, 2027
Subsequent Events [Member] | Unsecured Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Unsecured revolving credit facility	$ 2,500,000,000
Subsequent Events [Member] | ATM Share Offering [Member] | Forward Sales Agreements [Member]
Subsequent Event [Line Items]
Weighted average initial forward price per share	$ 80.22
Subsequent Events [Member] | ATM Share Offering [Member] | Forward Sales Agreements [Member] | Prior Program [Member]
Subsequent Event [Line Items]
Common Stock, Shares, Issued	1,740,550
Net proceeds from issuance of common stock	$ 139,600,000