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Detail of secured and unsecured debt (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Jun. 30, 2023
Feb. 29, 2024
Debt Instrument      
Effective rate (as a percent) 3.86%    
Future principal payments due on secured and unsecured debt      
2024 $ 32    
2025 600,034    
2026 779,926    
2027 350,038    
2028 425,041    
Thereafter 10,150,438    
Principal 12,305,509    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (88,346)    
Total Consolidated $ 12,217,163    
99 Coolidge Avenue | Alexandria      
Debt Instrument      
Noncontrolling Interest, Ownership Percentage by Parent 75.00%    
Secured notes payable      
Debt Instrument      
Effective rate (as a percent) 8.36%    
Future principal payments due on secured and unsecured debt      
2024 $ 32    
2025 34    
2026 129,926    
2027 38    
2028 41    
Thereafter 438    
Principal 130,509    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (459)    
Total Consolidated $ 130,050    
Secured notes payable maturing on 11/19/26      
Debt Instrument      
Effective rate (as a percent) 8.37%    
Maturity Date Nov. 19, 2026    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 129,890    
2027 0    
2028 0    
Thereafter 0    
Principal 129,890    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (459)    
Total Consolidated 129,431    
Secured notes payable maturing on 11/19/26 | 99 Coolidge Avenue      
Debt Instrument      
Debt instrument, borrowing capacity $ 65,400    
Secured Notes Payable Maturing on 7/1/36      
Debt Instrument      
Stated interest rate (as a percent) 6.50%    
Effective rate (as a percent) 6.50%    
Maturity Date Jul. 01, 2036    
Future principal payments due on secured and unsecured debt      
2024 $ 32    
2025 34    
2026 36    
2027 38    
2028 41    
Thereafter 438    
Principal 619    
Unamortized (Deferred Financing Cost), (Discount)/ Premium 0    
Total Consolidated $ 619    
Unsecured Debt      
Debt Instrument      
Effective rate (as a percent) 3.81%    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 600,000    
2026 650,000    
2027 350,000    
2028 425,000    
Thereafter 10,150,000    
Principal 12,175,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (87,887)    
Total Consolidated 12,087,113    
Unsecured senior line of credit      
Debt Instrument      
Line of Credit Facility, Maximum Borrowing Capacity 5,000,000    
Future principal payments due on secured and unsecured debt      
Total Consolidated $ 0    
3.45% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 3.45%    
Effective rate (as a percent) 3.62%    
Maturity Date Apr. 30, 2025    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 600,000    
2026 0    
2027 0    
2028 0    
Thereafter 0    
Principal 600,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (960)    
Total Consolidated $ 599,040    
4.30% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 4.30%    
Effective rate (as a percent) 4.50%    
Maturity Date Jan. 15, 2026    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 300,000    
2027 0    
2028 0    
Thereafter 0    
Principal 300,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (900)    
Total Consolidated $ 299,100    
3.80% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 3.80%    
Effective rate (as a percent) 3.96%    
Maturity Date Apr. 15, 2026    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 350,000    
2027 0    
2028 0    
Thereafter 0    
Principal 350,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (1,021)    
Total Consolidated $ 348,979    
3.95% Unsecured Senior Notes Payable Due in 2027      
Debt Instrument      
Stated interest rate (as a percent) 3.95%    
Effective rate (as a percent) 4.13%    
Maturity Date Jan. 15, 2027    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 350,000    
2028 0    
Thereafter 0    
Principal 350,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (1,448)    
Total Consolidated $ 348,552    
3.95% Unsecured Senior Notes Payable Due in 2028      
Debt Instrument      
Stated interest rate (as a percent) 3.95%    
Effective rate (as a percent) 4.07%    
Maturity Date Jan. 15, 2028    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 425,000    
Thereafter 0    
Principal 425,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (1,628)    
Total Consolidated $ 423,372    
4.50% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 4.50%    
Effective rate (as a percent) 4.60%    
Maturity Date Jul. 30, 2029    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 300,000    
Principal 300,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (1,193)    
Total Consolidated $ 298,807    
2.75% Unsecured Senior Notes Payable Due 2029      
Debt Instrument      
Stated interest rate (as a percent) 2.75%    
Effective rate (as a percent) 2.87%    
Maturity Date Dec. 15, 2029    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 400,000    
Principal 400,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (2,371)    
Total Consolidated $ 397,629    
4.70% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 4.70%    
Effective rate (as a percent) 4.81%    
Maturity Date Jul. 01, 2030    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 450,000    
Principal 450,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (2,333)    
Total Consolidated $ 447,667    
4.90% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 4.90%    
Effective rate (as a percent) 5.05%    
Maturity Date Dec. 15, 2030    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 700,000    
Principal 700,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (5,316)    
Total Consolidated $ 694,684    
3.375% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 3.375%    
Effective rate (as a percent) 3.48%    
Maturity Date Aug. 15, 2031    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 750,000    
Principal 750,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (4,830)    
Total Consolidated $ 745,170    
2.00% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 2.00%    
Effective rate (as a percent) 2.12%    
Maturity Date May 18, 2032    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 900,000    
Principal 900,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (7,657)    
Total Consolidated $ 892,343    
1.875% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 1.875%    
Effective rate (as a percent) 1.97%    
Maturity Date Feb. 01, 2033    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 1,000,000    
Principal 1,000,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (7,760)    
Total Consolidated $ 992,240    
2.95% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 2.95%    
Effective rate (as a percent) 3.07%    
Maturity Date Mar. 15, 2034    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 800,000    
Principal 800,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (7,801)    
Total Consolidated $ 792,199    
4.75% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 4.75%    
Effective rate (as a percent) 4.88%    
Maturity Date Apr. 15, 2035    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 500,000    
Principal 500,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (5,298)    
Total Consolidated $ 494,702    
5.25% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 5.25%   5.25%
Effective rate (as a percent) 5.38%    
Maturity Date May 15, 2036    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 400,000    
Principal 400,000   $ 400,000
Unamortized (Deferred Financing Cost), (Discount)/ Premium (4,364)    
Total Consolidated $ 395,636    
4.85% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 4.85%    
Effective rate (as a percent) 4.93%    
Maturity Date Apr. 15, 2049    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 300,000    
Principal 300,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (2,958)    
Total Consolidated $ 297,042    
4.00% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 4.00%    
Effective rate (as a percent) 3.91%    
Maturity Date Feb. 01, 2050    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 700,000    
Principal 700,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium 10,080    
Total Consolidated $ 710,080    
3.00% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 3.00%    
Effective rate (as a percent) 3.08%    
Maturity Date May 18, 2051    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 850,000    
Principal 850,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (11,513)    
Total Consolidated $ 838,487    
3.55% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 3.55%    
Effective rate (as a percent) 3.63%    
Maturity Date Mar. 15, 2052    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 1,000,000    
Principal 1,000,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (14,002)    
Total Consolidated $ 985,998    
5.15% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 5.15%    
Effective rate (as a percent) 5.26%    
Maturity Date Apr. 15, 2053    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 500,000    
Principal 500,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (7,757)    
Total Consolidated $ 492,243    
5.625% Unsecured Senior Notes Payable      
Debt Instrument      
Stated interest rate (as a percent) 5.625%   5.625%
Effective rate (as a percent) 5.71%    
Maturity Date May 15, 2054    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 600,000    
Principal 600,000   $ 600,000
Unamortized (Deferred Financing Cost), (Discount)/ Premium (6,857)    
Total Consolidated 593,143    
Commercial Paper      
Debt Instrument      
Commercial paper, maximum issuance 2,500,000    
Future principal payments due on secured and unsecured debt      
Principal $ 0    
Commercial Paper | Unsecured senior line of credit      
Debt Instrument      
Effective rate (as a percent) 0.00%    
Maturity Date Jan. 22, 2028    
Future principal payments due on secured and unsecured debt      
2024 $ 0    
2025 0    
2026 0    
2027 0    
2028 0    
Thereafter 0    
Principal 0    
Unamortized (Deferred Financing Cost), (Discount)/ Premium 0    
Total Consolidated $ 0    
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Secured notes payable maturing on 11/19/26      
Debt Instrument      
Applicable margin (as a percent) 2.70%    
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Unsecured senior line of credit      
Debt Instrument      
Applicable margin (as a percent) 0.855% 0.875%