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

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Debt Instrument, Terms, Extension Period

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Debt Instrument, Terms, Number Of Extension Options

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Line Of Credit Facility, Number Of Lines Of Credit

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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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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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The average effective interest rate during the reporting period.

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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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Fixed interest rate related to the interest rate derivative.

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Nominal or face amount used to calculate payment on derivative.

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The number of derivative instruments of a particular group held by the entity.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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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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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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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)	Feb. 29, 2020 USD ($)	Apr. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Dec. 31, 2019 USD ($) instrument line_of_credit Option	Dec. 31, 2018 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 ($)	Mar. 31, 2017 USD ($)	Nov. 30, 2016 USD ($)	Oct. 31, 2016 USD ($)	Apr. 30, 2016	Mar. 31, 2015 USD ($)	Apr. 30, 2014 USD ($)
Debt Instrument [Line Items]
Senior notes				$ 200,000,000	$ 275,000,000.0
Effective interest rate				4.40%	4.50%
Unsecured debt, net				$ 4,763,206,000	$ 3,799,316,000
Debt instrument face amount				$ 4,250,000,000	3,200,000,000
Number of lines of credit \| line_of_credit				2
Lines of credit				$ 55,000,000	0
Unsecured Bonds 3.000%
Debt Instrument [Line Items]
Debt instrument face amount				550,000,000	0
Unsecured Bonds 4.000%
Debt Instrument [Line Items]
Debt instrument face amount				500,000,000	0
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%, Due April 2026
Debt Instrument [Line Items]
Debt instrument face amount				450,000,000.0	450,000,000
Unsecured Bonds 5.200%
Debt Instrument [Line Items]
Debt instrument face amount				300,000,000	300,000,000
Unsecured Bonds 3.375%
Debt Instrument [Line Items]
Debt instrument face amount				300,000,000	300,000,000
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
Unsecured Bonds 3.625%
Debt Instrument [Line Items]
Debt instrument face amount				$ 300,000,000	$ 300,000,000
Unsecured Line of Credit
Debt Instrument [Line Items]
Weighted average interest rate				2.50%	3.20%
Lines of credit				$ 55,000,000	$ 0
Unsecured Line of Credit \| Line of Credit Working Capital
Debt Instrument [Line Items]
Lines of credit				$ 0	$ 0
Variable Rate Term Loan
Debt Instrument [Line Items]
Unsecured debt, net													$ 350,000,000.0	$ 225,000,000.0
Weighted average interest rate				2.70%	3.00%
Basis spread on rate				0.95%
Variable Rate Term Loan \| Carrying Value
Debt Instrument [Line Items]
Unsecured debt, net				$ 349,189,000	$ 348,813,000
Senior Notes \| BRE Properties, Inc.
Debt Instrument [Line Items]
Unsecured debt, net				599,400,000	601,300,000
Long-term debt acquired																	$ 900,000,000.0
Senior Notes \| Unsecured Bonds 3.000%
Debt Instrument [Line Items]
Unsecured debt, net				$ 542,300,000
Debt instrument face amount						$ 150,000,000.0	$ 400,000,000.0
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				$ 494,100,000
Debt instrument face amount								$ 150,000,000.0	$ 350,000,000.0
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				$ 295,600,000	295,400,000
Debt instrument face amount										$ 300,000,000.0
Coupon rate				4.50%						4.50%
Debt offering price										99.591%
Senior Notes \| Unsecured Bonds 3.625%
Debt Instrument [Line Items]
Unsecured debt, net				$ 346,300,000	345,800,000
Debt instrument face amount											$ 350,000,000.0
Coupon rate				3.625%
Debt offering price											99.423%
Senior Notes \| Unsecured Bonds 3.375%, Due April 2026
Debt Instrument [Line Items]
Unsecured debt, net				$ 445,700,000	445,000,000.0
Coupon rate				3.375%
Debt offering price															99.386%
Senior Notes \| Unsecured Bonds 5.500%
Debt Instrument [Line Items]
Coupon rate																	5.50%
Face amount of debt paid off												$ 300,000,000.0
Senior Notes \| Unsecured Bonds 5.200%
Debt Instrument [Line Items]
Coupon rate				5.20%
Senior Notes \| Unsecured Bonds 3.375%
Debt Instrument [Line Items]
Coupon rate				3.375%
Senior Notes \| Unsecured Bonds 3.875%
Debt Instrument [Line Items]
Unsecured debt, net				$ 397,100,000	396,500,000
Debt instrument face amount																	$ 400,000,000.0
Coupon rate				3.875%													3.875%
Debt offering price																	99.234%
Senior Notes \| Unsecured Bonds 3.250%
Debt Instrument [Line Items]
Coupon rate		3.25%		3.25%
Debt offering price		99.152%
Proceeds from issuance of unsecured debt		$ 300,000,000.0
Long-term debt, gross				$ 298,200,000	297,600,000
Senior Notes \| Unsecured Bonds 3.625%
Debt Instrument [Line Items]
Coupon rate			3.625%	3.625%
Debt offering price			98.99%
Proceeds from issuance of unsecured debt			$ 300,000,000.0
Long-term debt, gross				$ 298,400,000	297,800,000
Unsecured Debt \| Senior Unsecured Notes Maturing April 1, 2025
Debt Instrument [Line Items]
Senior notes				497,100,000	496,500,000
Debt instrument face amount																$ 500,000,000.0
Coupon rate																3.50%
Debt offering price																99.747%
Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity				1,240,000,000
Line of Credit \| Line of Credit Working Capital
Debt Instrument [Line Items]
Maximum borrowing capacity				35,000,000.0
Line of Credit \| Unsecured Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity				1,200,000,000
Lines of credit				$ 55,000,000.0	$ 0
Number of extension options \| Option				1
Term extension period				18 months
Line of Credit \| Unsecured Line of Credit \| LIBOR
Debt Instrument [Line Items]
Basis spread on rate				0.825%	0.825%
Line of Credit \| Working Capital Unsecured Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 35,000,000.0
Interest Rate Swap \| Variable Rate Term Loan
Debt Instrument [Line Items]
Unsecured debt, net				$ 350,000,000.0	$ 350,000,000
Number of derivative instruments held \| instrument				5
Term of loan				5 years
Interest Rate Swap \| Variable Rate Term Loan \| Variable Term Loan, Tranche One
Debt Instrument [Line Items]
Derivative notional amount				$ 175,000,000.0
Derivative, fixed interest rate				2.30%
Subsequent Event \| Senior Notes \| Unsecured Bonds 2.650%
Debt Instrument [Line Items]
Coupon rate	2.65%
Proceeds from issuance of unsecured debt	$ 500,000,000.0