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Unsecured senior notes payable, LOC, and commercial paper (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2023
Mar. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Jun. 30, 2023
Sep. 22, 2022
Debt Instrument            
Principal     $ 11,284,914      
Debt Balance at 100%     11,202,835      
Commercial Paper            
Debt Instrument            
Principal     0      
Commercial paper, maximum issuance     $ 2,500,000   $ 2,000,000  
Weighted-average yield to maturity, commercial paper     5.15%      
Weighted-average remaining maturity term, commercial paper     13 days      
Commercial Paper | Maximum            
Debt Instrument            
Debt Instrument, Term     397 days      
Commercial Paper | Minimum            
Debt Instrument            
Debt Instrument, Term     30 days      
Total issuance of unsecured senior notes in Feb 2023            
Debt Instrument            
Total issuance of unsecured senior notes $ 1,000,000          
Weighted Average Interest Rate 4.95%          
Weighted average maturity years 21 years 2 months 12 days          
4.75% Unsecured Senior Notes Payable            
Debt Instrument            
Principal $ 500,000   $ 500,000      
Stated interest rate (as a percent) 4.75%   4.75%      
Debt Balance at 100%     $ 494,476      
5.15% Unsecured Senior Notes Payable            
Debt Instrument            
Principal $ 500,000   $ 500,000      
Stated interest rate (as a percent) 5.15%   5.15%      
Debt Balance at 100%     $ 492,133      
Unsecured senior line of credit            
Debt Instrument            
Line of Credit Facility, Maximum Borrowing Capacity   $ 4,000,000 $ 5,000,000      
Interest rate adjustment amount, maximum           0.04%
Facility fee rate adjustment amount, maximum           0.01%
Facility fee rate adjustment amount, decrease   0.01%        
Interest rate adjustment amount, decrease   0.04%        
Annual facility fee (as a percent)     0.14% 0.15%    
Debt Balance at 100%     $ 0      
Unsecured senior line of credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate            
Debt Instrument            
Applicable margin (as a percent)     0.835% 0.875%    
Unsecured senior line of credit | Commercial Paper            
Debt Instrument            
Principal     $ 0      
Debt Balance at 100%     $ 0