v3.26.3
Unsecured senior notes payable, LOC, and commercial paper (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2026
Sep. 30, 2026
Jun. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Feb. 10, 2026
Dec. 31, 2025
Feb. 28, 2025
Debt Instrument                  
Principal   $ 12,986,055     $ 12,986,055        
Proceeds from issuances under commercial paper program         38,494,264 $ 15,378,015      
Repayments of Unsecured Debt         1,602,203 600,000      
(Loss) gain on early extinguishment of debt   (3,323)   $ (107) 363,112 $ (107)      
Line of Credit Facility [Abstract]                  
Debt Balance at 100%   12,896,996     12,896,996        
Commercial Paper                  
Debt Instrument                  
Principal   1,090,000     1,090,000        
Long-Term Commercial Paper [Abstract]                  
Commercial paper, maximum issuance   2,500,000     $ 2,500,000        
Weighted-average yield to maturity, commercial paper         4.19%        
Weighted-average remaining maturity term, commercial paper         14 days        
Commercial Paper | Minimum                  
Long-Term Commercial Paper [Abstract]                  
Debt Instrument, Term         30 days        
Commercial Paper | Maximum                  
Long-Term Commercial Paper [Abstract]                  
Debt Instrument, Term         397 days        
4.00% Unsecured Senior Notes, 3.00% Unsecured Senior Notes, and 3.55% Unsecured Senior Notes                  
Debt Instrument                  
Principal             $ 1,330,000    
Repayments of Unsecured Debt $ 952,200                
(Loss) gain on early extinguishment of debt     $ 366,400            
4.00% Unsecured Senior Notes, 3.00% Unsecured Senior Notes, and 3.55% Unsecured Senior Notes | Commercial Paper                  
Debt Instrument                  
Proceeds from issuances under commercial paper program $ 200,000                
4.00% Unsecured Senior Notes Payable                  
Debt Instrument                  
Principal   $ 390,801     $ 390,801        
Stated interest rate (as a percent)   4.00%     4.00%        
Line of Credit Facility [Abstract]                  
Debt Balance at 100%   $ 396,220     $ 396,220        
3.00% Unsecured Senior Notes Payable                  
Debt Instrument                  
Principal   $ 352,398     $ 352,398        
Stated interest rate (as a percent)   3.00%     3.00%        
Line of Credit Facility [Abstract]                  
Debt Balance at 100%   $ 348,025     $ 348,025        
3.55% Unsecured Senior Notes Payable                  
Debt Instrument                  
Principal   $ 475,406     $ 475,406        
Stated interest rate (as a percent)   3.55%     3.55%        
Line of Credit Facility [Abstract]                  
Debt Balance at 100%   $ 469,279     $ 469,279        
5.25% Unsecured Senior Notes Payable                  
Debt Instrument                  
Principal   $ 400,000     $ 400,000       $ 750,000
Stated interest rate (as a percent)   5.25%     5.25%       5.25%
Line of Credit Facility [Abstract]                  
Debt Balance at 100%   $ 396,492     $ 396,492        
4.30% Unsecured Senior Notes Payable                  
Debt Instrument                  
Stated interest rate (as a percent)               4.30%  
Repayments of Unsecured Debt     300,000            
(Loss) gain on early extinguishment of debt     $ 0            
3.80% Unsecured Senior Notes Payable                  
Debt Instrument                  
Stated interest rate (as a percent)               3.80%  
Repayments of Unsecured Debt   350,000              
(Loss) gain on early extinguishment of debt   0              
Junior Subordinated Debt                  
Debt Instrument                  
Principal   $ 1,000,000     $ 1,000,000        
Stated interest rate (as a percent)   7.25%     7.25%        
Line of Credit Facility [Abstract]                  
Applicable margin (as a percent)         2.889%        
Debt Instrument, Face Amount   $ 1,000,000     $ 1,000,000        
Debt Balance at 100%   985,143     985,143        
Unsecured senior line of credit                  
Debt Instrument                  
(Loss) gain on early extinguishment of debt   3,300              
Line of Credit Facility [Abstract]                  
Line of Credit Facility, Maximum Borrowing Capacity   $ 5,000,000     5,000,000        
Applicable margin (as a percent)   0.725% 0.835%            
Annual facility fee (as a percent)   0.15% 0.14%            
Debt Balance at 100%   $ 0     0        
Unsecured senior line of credit | Commercial Paper                  
Debt Instrument                  
Principal   1,092,450     1,092,450        
Line of Credit Facility [Abstract]                  
Debt Balance at 100%   $ 1,091,166     $ 1,091,166