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Detail of secured and unsecured debt (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Jun. 30, 2023
Mar. 31, 2023
Feb. 28, 2023
Debt Instrument          
Effective rate (as a percent) 3.70%        
Future principal payments due on secured and unsecured debt          
2023 $ 0        
2024 32        
2025 600,034        
2026 759,331        
2027 350,038        
Thereafter 9,575,479        
Principal 11,284,914        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (82,079)        
Total Consolidated $ 11,202,835        
99 Coolidge Avenue | Alexandria          
Debt Instrument          
Noncontrolling Interest, Ownership Percentage by Parent 75.00%        
Secured notes payable          
Debt Instrument          
Effective rate (as a percent) 8.35%        
Future principal payments due on secured and unsecured debt          
2023 $ 0        
2024 32        
2025 34        
2026 109,331        
2027 38        
Thereafter 479        
Principal 109,914        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (804)        
Total Consolidated $ 109,110        
Secured notes payable maturing on 11/19/26          
Debt Instrument          
Effective rate (as a percent) 8.36%        
Maturity Date Nov. 19, 2026        
Future principal payments due on secured and unsecured debt          
2023 $ 0        
2024 0        
2025 0        
2026 109,295        
2027 0        
Thereafter 0        
Principal 109,295        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (804)        
Total Consolidated 108,491        
Secured notes payable maturing on 11/19/26 | 99 Coolidge Avenue          
Debt Instrument          
Debt instrument, borrowing capacity $ 86,000        
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          
2023 $ 0        
2024 32        
2025 34        
2026 36        
2027 38        
Thereafter 479        
Principal 619        
Unamortized (Deferred Financing Cost), (Discount)/ Premium 0        
Total Consolidated $ 619        
Unsecured Debt          
Debt Instrument          
Effective rate (as a percent) 3.65%        
Future principal payments due on secured and unsecured debt          
2023 $ 0        
2024 0        
2025 600,000        
2026 650,000        
2027 350,000        
Thereafter 9,575,000        
Principal 11,175,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (81,275)        
Total Consolidated 11,093,725        
Unsecured senior line of credit          
Debt Instrument          
Line of Credit Facility, Maximum Borrowing Capacity 5,000,000     $ 4,000,000  
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          
2023 $ 0        
2024 0        
2025 600,000        
2026 0        
2027 0        
Thereafter 0        
Principal 600,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (1,402)        
Total Consolidated $ 598,598        
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          
2023 $ 0        
2024 0        
2025 0        
2026 300,000        
2027 0        
Thereafter 0        
Principal 300,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (1,144)        
Total Consolidated $ 298,856        
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          
2023 $ 0        
2024 0        
2025 0        
2026 350,000        
2027 0        
Thereafter 0        
Principal 350,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (1,265)        
Total Consolidated $ 348,735        
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          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 350,000        
Thereafter 0        
Principal 350,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (1,699)        
Total Consolidated $ 348,301        
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          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 425,000        
Principal 425,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (1,838)        
Total Consolidated $ 423,162        
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          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 300,000        
Principal 300,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (1,304)        
Total Consolidated $ 298,696        
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          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 400,000        
Principal 400,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (2,574)        
Total Consolidated $ 397,426        
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          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 450,000        
Principal 450,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (2,518)        
Total Consolidated $ 447,482        
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          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 700,000        
Principal 700,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (5,706)        
Total Consolidated $ 694,294        
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          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 750,000        
Principal 750,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (5,149)        
Total Consolidated $ 744,851        
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          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 900,000        
Principal 900,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (8,116)        
Total Consolidated $ 891,884        
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          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 1,000,000        
Principal 1,000,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (8,192)        
Total Consolidated $ 991,808        
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          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 800,000        
Principal 800,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (8,177)        
Total Consolidated $ 791,823        
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%        
Maturity Date Apr. 15, 2035        
Future principal payments due on secured and unsecured debt          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 500,000        
Principal 500,000       $ 500,000
Unamortized (Deferred Financing Cost), (Discount)/ Premium (5,524)        
Total Consolidated $ 494,476        
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          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 300,000        
Principal 300,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (3,016)        
Total Consolidated $ 296,984        
4.00% Unsecured Senior Notes Payables Due 2050          
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          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 700,000        
Principal 700,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium 10,140        
Total Consolidated $ 710,140        
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          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 850,000        
Principal 850,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (11,703)        
Total Consolidated $ 838,297        
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          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 1,000,000        
Principal 1,000,000        
Unamortized (Deferred Financing Cost), (Discount)/ Premium (14,221)        
Total Consolidated $ 985,779        
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%        
Maturity Date Apr. 15, 2053        
Future principal payments due on secured and unsecured debt          
2023 $ 0        
2024 0        
2025 0        
2026 0        
2027 0        
Thereafter 500,000        
Principal 500,000       $ 500,000
Unamortized (Deferred Financing Cost), (Discount)/ Premium (7,867)        
Total Consolidated 492,133        
Commercial Paper          
Debt Instrument          
Commercial paper, maximum issuance 2,500,000   $ 2,000,000    
Future principal payments due on secured and unsecured debt          
Principal $ 0        
Commercial Paper | Unsecured senior line of credit          
Debt Instrument          
Maturity Date Jan. 22, 2028        
Future principal payments due on secured and unsecured debt          
2024 $ 0        
2025 0        
2026 0        
2027 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) 0.835% 0.875%