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Summary of secured and unsecured debt (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
USD ($)
Debt Instrument  
Long-term debt $ 12,044,999
Long-term debt, percentage bearing variable interest, amount, net 1,548,542
Total Consolidated $ 13,593,541
Percentage of Total 100.00%
Interest Rate 3.97%
Weighted Average Remaining Terms (in years) 11 years 7 months 6 days
Percentage of fixed rate/hedged total debt 88.60%
Percentage of unhedged floating rate total debt 11.40%
Principal $ 13,675,000
Commercial Paper  
Debt Instrument  
Weighted Average Remaining Terms (in years) 11 years 1 month 6 days
Principal $ 1,500,000
Weighted-average yield to maturity, commercial paper 4.64%
Weighted-average remaining maturity term, commercial paper 17 days
Unsecured senior notes payable  
Debt Instrument  
Long-term debt $ 12,044,999
Long-term debt, percentage bearing variable interest, amount, net 0
Total Consolidated $ 12,044,999
Percentage of Total 88.60%
Interest Rate 3.90%
Weighted Average Remaining Terms (in years) 12 years 7 months 6 days
Unsecured senior line of credit  
Debt Instrument  
Total Consolidated $ 0
Unsecured senior line of credit | Commercial Paper  
Debt Instrument  
Long-term debt 0
Long-term debt, percentage bearing variable interest, amount, net 1,548,542
Total Consolidated $ 1,548,542
Percentage of Total 11.40%
Interest Rate 4.52%
Weighted Average Remaining Terms (in years) 4 years 3 months 18 days
Principal $ 1,550,000