Debt - Narrative (Details) - USD ($)	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Notes Payable, Unsecured Notes and Credit Facility
Commercial paper, maximum borrowing capacity	$ 500,000,000
Repayments of unsecured debt	250,000,000	$ 100,000,000
Net carrying value of apartment communities and improved land parcels securing debt	19,061,578,000		$ 18,992,807,000
Asset Pledged as Collateral | Notes Payable, Other Payables
Notes Payable, Unsecured Notes and Credit Facility
Net carrying value of apartment communities and improved land parcels securing debt	1,166,698,000
Notes Payable 2.850 Maturities 2023 | Unsecured notes
Notes Payable, Unsecured Notes and Credit Facility
Repayments of unsecured debt	250,000,000
Credit Facility
Notes Payable, Unsecured Notes and Credit Facility
Available borrowing capacity	$ 2,250,000,000		$ 2,250,000,000
Annual facility fee, percentage	0.125%
Credit Facility | Minimum
Notes Payable, Unsecured Notes and Credit Facility
Annual facility fee, percentage	0.10%
Credit Facility | Maximum
Notes Payable, Unsecured Notes and Credit Facility
Annual facility fee, percentage	0.30%
Credit Facility | Secured Overnight Financing Rate (SOFR)
Notes Payable, Unsecured Notes and Credit Facility
Current interest rate (as a percent)	5.92%
Debt instrument, basis spread on variable rate (as a percent)	0.825%
Credit Facility | Secured Overnight Financing Rate (SOFR) | Minimum
Notes Payable, Unsecured Notes and Credit Facility
Debt instrument, basis spread on variable rate (as a percent)	0.65%
Credit Facility | Secured Overnight Financing Rate (SOFR) | Maximum
Notes Payable, Unsecured Notes and Credit Facility
Debt instrument, basis spread on variable rate (as a percent)	1.40%
Credit Facility | SOFR Adjustment
Notes Payable, Unsecured Notes and Credit Facility
Debt instrument, basis spread on variable rate (as a percent)	0.10%
Credit Facility | SOFR Base Rate
Notes Payable, Unsecured Notes and Credit Facility
Debt instrument, basis spread on variable rate (as a percent)	0.725%