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Detail of secured and unsecured debt (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2024
Dec. 31, 2023
Feb. 29, 2024
Debt Instrument          
Effective rate (as a percent) 3.91%   3.91%    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 600,034   600,034    
2026 794,563   794,563    
2027 350,038   350,038    
2028 425,041   425,041    
Thereafter 10,605,438   10,605,438    
Principal 12,775,114   12,775,114    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (83,513)   (83,513)    
Total Consolidated $ 12,691,601   $ 12,691,601    
99 Coolidge Avenue | Alexandria          
Debt Instrument          
Noncontrolling Interest, Ownership Percentage by Parent 75.00%   75.00%    
Secured notes payable          
Debt Instrument          
Effective rate (as a percent) 8.39%   8.39%    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 34   34    
2026 144,563   144,563    
2027 38   38    
2028 41   41    
Thereafter 438   438    
Principal 145,114   145,114    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (114)   (114)    
Total Consolidated $ 145,000   $ 145,000    
Secured notes payable maturing on 11/19/26          
Debt Instrument          
Applicable margin (as a percent)     2.70%    
Effective rate (as a percent) 8.40%   8.40%    
Maturity Date     Nov. 19, 2026    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 144,527   144,527    
2027 0   0    
2028 0   0    
Thereafter 0   0    
Principal 144,527   144,527    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (114)   (114)    
Total Consolidated 144,413   144,413    
Secured notes payable maturing on 11/19/26 | 99 Coolidge Avenue          
Debt Instrument          
Debt instrument, borrowing capacity $ 50,800   $ 50,800    
Secured Notes Payable Maturing on 7/1/36          
Debt Instrument          
Stated interest rate (as a percent) 6.50%   6.50%    
Effective rate (as a percent) 6.50%   6.50%    
Maturity Date     Jul. 01, 2036    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 34   34    
2026 36   36    
2027 38   38    
2028 41   41    
Thereafter 438   438    
Principal 587   587    
Unamortized (Deferred Financing Cost), (Discount)/ Premium 0   0    
Total Consolidated $ 587   $ 587    
Unsecured Debt          
Debt Instrument          
Effective rate (as a percent) 3.85%   3.85%    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 600,000   600,000    
2026 650,000   650,000    
2027 350,000   350,000    
2028 425,000   425,000    
Thereafter 10,605,000   10,605,000    
Principal 12,630,000   12,630,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (83,399)   (83,399)    
Total Consolidated 12,546,601   $ 12,546,601    
Unsecured senior line of credit          
Debt Instrument          
Applicable margin (as a percent)     0.855% 0.875%  
Line of Credit Facility, Maximum Borrowing Capacity 5,000,000   $ 5,000,000    
Future principal payments due on secured and unsecured debt          
Total Consolidated $ 0   $ 0    
3.45% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 3.45%   3.45%    
Effective rate (as a percent) 3.62%   3.62%    
Maturity Date     Apr. 30, 2025    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 600,000   600,000    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 0   0    
Principal 600,000   600,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (518)   (518)    
Total Consolidated $ 599,482   $ 599,482    
4.30% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 4.30%   4.30%    
Effective rate (as a percent) 4.50%   4.50%    
Maturity Date     Jan. 15, 2026    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 300,000   300,000    
2027 0   0    
2028 0   0    
Thereafter 0   0    
Principal 300,000   300,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (655)   (655)    
Total Consolidated $ 299,345   $ 299,345    
3.80% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 3.80%   3.80%    
Effective rate (as a percent) 3.96%   3.96%    
Maturity Date     Apr. 15, 2026    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 350,000   350,000    
2027 0   0    
2028 0   0    
Thereafter 0   0    
Principal 350,000   350,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (776)   (776)    
Total Consolidated $ 349,224   $ 349,224    
3.95% Unsecured Senior Notes Payable Due in 2027          
Debt Instrument          
Stated interest rate (as a percent) 3.95%   3.95%    
Effective rate (as a percent) 4.13%   4.13%    
Maturity Date     Jan. 15, 2027    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 350,000   350,000    
2028 0   0    
Thereafter 0   0    
Principal 350,000   350,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (1,194)   (1,194)    
Total Consolidated $ 348,806   $ 348,806    
3.95% Unsecured Senior Notes Payable Due in 2028          
Debt Instrument          
Stated interest rate (as a percent) 3.95%   3.95%    
Effective rate (as a percent) 4.07%   4.07%    
Maturity Date     Jan. 15, 2028    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 425,000   425,000    
Thereafter 0   0    
Principal 425,000   425,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (1,418)   (1,418)    
Total Consolidated $ 423,582   $ 423,582    
4.50% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 4.50%   4.50%    
Effective rate (as a percent) 4.60%   4.60%    
Maturity Date     Jul. 30, 2029    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 300,000   300,000    
Principal 300,000   300,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (1,082)   (1,082)    
Total Consolidated $ 298,918   $ 298,918    
2.75% Unsecured Senior Notes Payable Due 2029          
Debt Instrument          
Stated interest rate (as a percent) 2.75%   2.75%    
Effective rate (as a percent) 2.87%   2.87%    
Maturity Date     Dec. 15, 2029    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 400,000   400,000    
Principal 400,000   400,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (2,167)   (2,167)    
Total Consolidated $ 397,833   $ 397,833    
4.70% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 4.70%   4.70%    
Effective rate (as a percent) 4.81%   4.81%    
Maturity Date     Jul. 01, 2030    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 450,000   450,000    
Principal 450,000   450,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (2,149)   (2,149)    
Total Consolidated $ 447,851   $ 447,851    
4.90% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 4.90%   4.90%    
Effective rate (as a percent) 5.05%   5.05%    
Maturity Date     Dec. 15, 2030    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 700,000   700,000    
Principal 700,000   700,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (4,926)   (4,926)    
Total Consolidated $ 695,074   $ 695,074    
3.375% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 3.375%   3.375%    
Effective rate (as a percent) 3.48%   3.48%    
Maturity Date     Aug. 15, 2031    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 750,000   750,000    
Principal 750,000   750,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (4,509)   (4,509)    
Total Consolidated $ 745,491   $ 745,491    
2.00% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 2.00%   2.00%    
Effective rate (as a percent) 2.12%   2.12%    
Maturity Date     May 18, 2032    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 900,000   900,000    
Principal 900,000   900,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (7,198)   (7,198)    
Total Consolidated $ 892,802   $ 892,802    
1.875% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 1.875%   1.875%    
Effective rate (as a percent) 1.97%   1.97%    
Maturity Date     Feb. 01, 2033    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 1,000,000   1,000,000    
Principal 1,000,000   1,000,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (7,326)   (7,326)    
Total Consolidated $ 992,674   $ 992,674    
2.95% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 2.95%   2.95%    
Effective rate (as a percent) 3.07%   3.07%    
Maturity Date     Mar. 15, 2034    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 800,000   800,000    
Principal 800,000   800,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (7,425)   (7,425)    
Total Consolidated $ 792,575   $ 792,575    
4.75% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 4.75%   4.75%    
Effective rate (as a percent) 4.88%   4.88%    
Maturity Date     Apr. 15, 2035    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 500,000   500,000    
Principal 500,000   500,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (5,071)   (5,071)    
Total Consolidated $ 494,929   $ 494,929    
5.25% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 5.25%   5.25%   5.25%
Effective rate (as a percent) 5.38%   5.38%    
Maturity Date     May 15, 2036    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 400,000   400,000    
Principal 400,000   400,000   $ 400,000
Unamortized (Deferred Financing Cost), (Discount)/ Premium (4,195)   (4,195)    
Total Consolidated $ 395,805   $ 395,805    
4.85% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 4.85%   4.85%    
Effective rate (as a percent) 4.93%   4.93%    
Maturity Date     Apr. 15, 2049    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 300,000   300,000    
Principal 300,000   300,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (2,900)   (2,900)    
Total Consolidated $ 297,100   $ 297,100    
4.00% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 4.00%   4.00%    
Effective rate (as a percent) 3.91%   3.91%    
Maturity Date     Feb. 01, 2050    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 700,000   700,000    
Principal 700,000   700,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium 10,017   10,017    
Total Consolidated $ 710,017   $ 710,017    
3.00% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 3.00%   3.00%    
Effective rate (as a percent) 3.08%   3.08%    
Maturity Date     May 18, 2051    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 850,000   850,000    
Principal 850,000   850,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (11,322)   (11,322)    
Total Consolidated $ 838,678   $ 838,678    
3.55% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 3.55%   3.55%    
Effective rate (as a percent) 3.63%   3.63%    
Maturity Date     Mar. 15, 2052    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 1,000,000   1,000,000    
Principal 1,000,000   1,000,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (13,782)   (13,782)    
Total Consolidated $ 986,218   $ 986,218    
5.15% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 5.15%   5.15%    
Effective rate (as a percent) 5.26%   5.26%    
Maturity Date     Apr. 15, 2053    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 500,000   500,000    
Principal 500,000   500,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (7,647)   (7,647)    
Total Consolidated $ 492,353   $ 492,353    
5.625% Unsecured Senior Notes Payable          
Debt Instrument          
Stated interest rate (as a percent) 5.625%   5.625%   5.625%
Effective rate (as a percent) 5.71%   5.71%    
Maturity Date     May 15, 2054    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 600,000   600,000    
Principal 600,000   600,000   $ 600,000
Unamortized (Deferred Financing Cost), (Discount)/ Premium (6,745)   (6,745)    
Total Consolidated 593,255   593,255    
Commercial Paper          
Debt Instrument          
Commercial paper, maximum issuance 2,500,000   2,500,000    
Future principal payments due on secured and unsecured debt          
Principal $ 454,600   $ 454,600    
Commercial Paper | Unsecured senior line of credit          
Debt Instrument          
Effective rate (as a percent) 5.05%   5.05%    
Maturity Date Jan. 22, 2030 Jan. 22, 2028 Jan. 22, 2030    
Future principal payments due on secured and unsecured debt          
2024 $ 0   $ 0    
2025 0   0    
2026 0   0    
2027 0   0    
2028 0   0    
Thereafter 455,000   455,000    
Principal 455,000   455,000    
Unamortized (Deferred Financing Cost), (Discount)/ Premium (411)   (411)    
Total Consolidated $ 454,589   $ 454,589