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Debt - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2025
Jul. 31, 2025
Jun. 30, 2025
Jul. 31, 2024
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Apr. 30, 2025
Dec. 31, 2024
Notes Payable, Unsecured Notes and Credit Facility                  
Commercial paper, maximum borrowing capacity         $ 1,000,000,000 $ 1,000,000,000   $ 500,000,000  
Repayment of unsecured notes           525,000,000 $ 0    
Net carrying value of apartment communities and improved land parcels securing debt         $ 20,526,249,000 20,526,249,000     $ 19,767,062,000
Minimum                  
Notes Payable, Unsecured Notes and Credit Facility                  
Debt instrument, basis spread on variable rate (as a percent)         (0.02%)        
Maximum                  
Notes Payable, Unsecured Notes and Credit Facility                  
Debt instrument, basis spread on variable rate (as a percent)         0.02%        
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         $ 1,217,993,000 1,217,993,000      
Credit Facility                  
Notes Payable, Unsecured Notes and Credit Facility                  
Available borrowing capacity         $ 2,500,000,000 $ 2,500,000,000   2,250,000,000 $ 2,250,000,000
Current interest rate (as a percent)         4.95% 4.95%      
Debt instrument, basis spread on variable rate (as a percent)         0.705%        
Annual facility fee, percentage         0.12%        
Debt instrument, basis spread on variable rate, increase (decrease)       0.02%          
Line of credit facility, commitment fee percentage, increase (decrease)       0.005%          
Credit Facility | Minimum                  
Notes Payable, Unsecured Notes and Credit Facility                  
Debt instrument, basis spread on variable rate (as a percent)         0.65%        
Annual facility fee, percentage         0.10%        
Credit Facility | Maximum                  
Notes Payable, Unsecured Notes and Credit Facility                  
Debt instrument, basis spread on variable rate (as a percent)         1.40%        
Annual facility fee, percentage         0.30%        
Variable Rate Unsecured Term Loan $550 Million                  
Notes Payable, Unsecured Notes and Credit Facility                  
Debt instrument, increase (decrease), other, net $ 100,000,000                
Variable Rate Unsecured Term Loan $550 Million | Unsecured notes                  
Notes Payable, Unsecured Notes and Credit Facility                  
Current interest rate (as a percent)         4.44% 4.44%      
Debt instrument, basis spread on variable rate (as a percent)         0.78%        
Assumption of fixed rate mortgage loan         $ 550,000,000 $ 550,000,000   $ 450,000,000  
Variable Rate Unsecured Term Loan $550 Million | Minimum                  
Notes Payable, Unsecured Notes and Credit Facility                  
Debt instrument, basis spread on variable rate (as a percent)         0.70%        
Variable Rate Unsecured Term Loan $550 Million | Maximum                  
Notes Payable, Unsecured Notes and Credit Facility                  
Debt instrument, basis spread on variable rate (as a percent)         1.60%        
Notes Payable 3.550 Maturities 2025 | Unsecured notes                  
Notes Payable, Unsecured Notes and Credit Facility                  
Repayment of unsecured notes     $ 525,000,000            
Fixed interest rate     3.45%            
Unsecured Notes 5.000 Percent                  
Notes Payable, Unsecured Notes and Credit Facility                  
Proceeds from issuance of debt   $ 394,888,000              
Unsecured Notes 5.000 Percent | Unsecured notes                  
Notes Payable, Unsecured Notes and Credit Facility                  
Current interest rate (as a percent)   5.05%              
Fixed interest rate   5.00%              
Unsecured Notes 5.000 Percent | Long-Term Debt                  
Notes Payable, Unsecured Notes and Credit Facility                  
Assumption of fixed rate mortgage loan   $ 400,000,000