The percentage of debt offering price at par value during the period.

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Equity Method Investment, Ownership Percentage Acquired

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Face (par) amount of the original debt instrument that was repurchased.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Unsecured Debt - Narrative (Details)	1 Months Ended				3 Months Ended	12 Months Ended
Unsecured Debt - Narrative (Details)	Jul. 31, 2022 USD ($) extension	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Apr. 30, 2013 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2022 USD ($) extension line_of_credit	Dec. 31, 2021 USD ($) extension	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Aug. 31, 2020 USD ($)	Feb. 29, 2020 USD ($)	Oct. 31, 2019 USD ($)	Aug. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Feb. 28, 2019 USD ($)	Mar. 31, 2018 USD ($)	Apr. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Apr. 30, 2016 USD ($)	Mar. 31, 2015 USD ($)	Apr. 30, 2014 USD ($)
Debt Instrument [Line Items]
Unsecured debt, net						$ 5,312,168,000	$ 5,307,196,000
Debt instrument face amount						$ 5,350,000,000	5,350,000,000
Number of lines of credit \| line_of_credit						2
Lines of credit						$ 52,073,000	341,257,000
CPPIB Interest
Debt Instrument [Line Items]
Investment interest acquired					45.00%
Essex Portfolio, L.P.
Debt Instrument [Line Items]
Unsecured debt, net						5,312,168,000	5,307,196,000
Lines of credit						52,073,000	341,257,000
Unsecured Bonds 1.700%
Debt Instrument [Line Items]
Debt instrument face amount						450,000,000	450,000,000
Unsecured Bonds 2.550%
Debt Instrument [Line Items]
Debt instrument face amount						300,000,000	300,000,000
Unsecured Bonds 2.650%
Debt Instrument [Line Items]
Debt instrument face amount						650,000,000	650,000,000
Unsecured Bonds 1.650%
Debt Instrument [Line Items]
Debt instrument face amount						300,000,000	300,000,000
Unsecured Bonds 2.650%
Debt Instrument [Line Items]
Debt instrument face amount						300,000,000	300,000,000
Unsecured Bonds 3.000%
Debt Instrument [Line Items]
Debt instrument face amount						550,000,000	550,000,000
Unsecured Bonds 4.000%
Debt Instrument [Line Items]
Debt instrument face amount						500,000,000	500,000,000
Unsecured Bonds 4.500%
Debt Instrument [Line Items]
Debt instrument face amount						300,000,000	300,000,000
Unsecured Bonds 3.625%
Debt Instrument [Line Items]
Debt instrument face amount						350,000,000	350,000,000
Unsecured Bonds 3.375%
Debt Instrument [Line Items]
Debt instrument face amount						450,000,000	450,000,000
Unsecured Bonds 3.875%
Debt Instrument [Line Items]
Debt instrument face amount						400,000,000	400,000,000
Unsecured Bonds 3.250%
Debt Instrument [Line Items]
Debt instrument face amount						300,000,000	$ 300,000,000
Line of Credit
Debt Instrument [Line Items]
Number of extension options \| extension	2						3
Term extension period	6 months						6 months
Maximum borrowing capacity	$ 1,200,000,000					1,240,000,000
Lines of credit						$ 52,073,000	$ 341,257,000
Line of Credit \| Line of Credit Working Capital
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 35,000,000
Line of Credit \| LIBOR
Debt Instrument [Line Items]
Basis spread on rate							0.775%
Line of Credit \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on rate						0.75%
Line of Credit \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Line of Credit Working Capital
Debt Instrument [Line Items]
Basis spread on rate						0.75%
Senior Notes \| BRE Properties, Inc.
Debt Instrument [Line Items]
Unsecured debt, net						$ 0	$ 0
Long-term debt acquired																					$ 900,000,000
Senior Notes \| Essex Portfolio, L.P.
Debt Instrument [Line Items]
Debt instrument face amount										$ 600,000,000
Senior Notes \| Unsecured Bonds 1.700%
Debt Instrument [Line Items]
Unsecured debt, net						$ 445,400,000	444,400,000
Coupon rate						1.70%
Senior Notes \| Unsecured Bonds 1.700% \| Essex Portfolio, L.P.
Debt Instrument [Line Items]
Debt instrument face amount								$ 450,000,000
Coupon rate								1.70%
Debt offering price								99.423%
Senior Notes \| Unsecured Bonds 2.550%
Debt Instrument [Line Items]
Unsecured debt, net						$ 296,200,000	295,700,000
Coupon rate						2.55%
Senior Notes \| Unsecured Bonds 2.550% \| Essex Portfolio, L.P.
Debt Instrument [Line Items]
Debt instrument face amount		$ 300,000,000
Coupon rate		2.55%
Debt offering price		99.367%
Senior Notes \| Unsecured Bonds 3.375%
Debt Instrument [Line Items]
Debt instrument face amount		$ 300,000,000
Coupon rate		3.375%
Senior Notes \| Unsecured Bonds 2.650%
Debt Instrument [Line Items]
Unsecured debt, net						$ 650,800,000	650,600,000
Debt instrument face amount			$ 150,000,000
Coupon rate						2.65%
Debt offering price			105.66%
Reoffer yield percentage			2.093%
Senior Notes \| Unsecured Bonds 2.650% \| Essex Portfolio, L.P.
Debt Instrument [Line Items]
Debt instrument face amount											$ 500,000,000
Coupon rate											2.65%
Debt offering price											99.628%
Repayments of secured debt					$ 100,300,000
Senior Notes \| Unsecured Bonds 1.650%
Debt Instrument [Line Items]
Coupon rate						1.65%
Debt offering price										99.035%
Senior Notes \| Unsecured Bonds 1.650% \| Essex Portfolio, L.P.
Debt Instrument [Line Items]
Unsecured debt, net						$ 295,500,000	295,100,000
Debt instrument face amount										$ 300,000,000
Coupon rate										1.65%
Senior Notes \| Unsecured Bonds 2.650%
Debt Instrument [Line Items]
Coupon rate						2.65%
Debt offering price										99.691%
Senior Notes \| Unsecured Bonds 2.650% \| Essex Portfolio, L.P.
Debt Instrument [Line Items]
Unsecured debt, net						$ 295,800,000	295,800,000
Debt instrument face amount										$ 300,000,000
Coupon rate										2.65%
Senior Notes \| Unsecured Bonds 3.000%
Debt Instrument [Line Items]
Unsecured debt, net						$ 544,700,000	543,900,000
Debt instrument face amount												$ 150,000,000	$ 400,000,000
Coupon rate						3.00%							3.00%
Debt offering price												101.685%	98.632%
Senior Notes \| Unsecured Bonds 4.000%
Debt Instrument [Line Items]
Unsecured debt, net						$ 496,000,000	495,400,000
Debt instrument face amount														$ 150,000,000	$ 350,000,000
Coupon rate						4.00%									4.00%
Debt offering price														100.717%	99.188%
Senior Notes \| Unsecured Bonds 4.500%
Debt Instrument [Line Items]
Unsecured debt, net						$ 296,100,000	295,900,000
Debt instrument face amount																$ 300,000,000
Coupon rate						4.50%										4.50%
Debt offering price																99.591%
Senior Notes \| Unsecured Bonds 3.625%
Debt Instrument [Line Items]
Unsecured debt, net						$ 347,800,000	347,300,000
Debt instrument face amount																	$ 350,000,000
Coupon rate						3.625%											3.625%
Debt offering price																	99.423%
Senior Notes \| Unsecured Bonds 3.375%
Debt Instrument [Line Items]
Unsecured debt, net						$ 447,800,000	447,100,000
Debt instrument face amount																			$ 450,000,000
Coupon rate						3.375%													3.375%
Debt offering price																			99.386%
Senior Notes \| Senior Unsecured Notes Maturing April 1, 2025
Debt Instrument [Line Items]
Unsecured debt, net						$ 498,800,000	498,200,000
Debt instrument face amount																				$ 500,000,000
Coupon rate																				3.50%
Debt offering price																				99.747%
Senior Notes \| Unsecured Bonds 5.500%
Debt Instrument [Line Items]
Coupon rate																					5.50%
Face amount of debt paid off																		$ 300,000,000
Senior Notes \| Unsecured Bonds 5.200%
Debt Instrument [Line Items]
Coupon rate																					5.20%
Face amount of debt paid off									$ 300,000,000
Senior Notes \| Unsecured Bonds 3.375%
Debt Instrument [Line Items]
Coupon rate																					3.375%
Repayments of senior debt		$ 300,000,000
Senior Notes \| Unsecured Bonds 3.875%
Debt Instrument [Line Items]
Unsecured debt, net						$ 399,100,000	398,500,000
Debt instrument face amount																					$ 400,000,000
Coupon rate						3.875%															3.875%
Debt offering price																					99.234%
Senior Notes \| Unsecured Bonds 3.250%
Debt Instrument [Line Items]
Unsecured debt, net						$ 299,800,000	$ 299,300,000
Coupon rate				3.25%		3.25%
Debt offering price				99.152%
Proceeds from issuance of unsecured debt				$ 300,000,000
Senior Notes \| Unsecured Bonds 3.625%
Debt Instrument [Line Items]
Debt instrument face amount										$ 300,000,000
Coupon rate										3.625%
Line of Credit \| Line of Credit Working Capital
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 35,000,000
Line of Credit \| LIBOR \| Line of Credit Working Capital
Debt Instrument [Line Items]
Basis spread on rate							0.775%
Line of Credit \| Unsecured Line of Credit
Debt Instrument [Line Items]
Number of extension options \| extension						3
Term extension period						6 months
Maximum borrowing capacity						$ 1,200,000,000
Lines of credit						40,000,000			340,000,000
Line of Credit \| Unsecured Line of Credit \| LIBOR
Debt Instrument [Line Items]
Basis spread on rate							0.775%
Line of Credit \| Working Capital Unsecured Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity						35,000,000
Unsecured Line of Credit
Debt Instrument [Line Items]
Number of extension options \| extension	2
Extension period	6 months
Unsecured Line of Credit \| Line of Credit Working Capital
Debt Instrument [Line Items]
Lines of credit						$ 12,100,000			$ 1,300,000
Unsecured Line of Credit \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on rate						0.75%