Quarterly report [Sections 13 or 15(d)]

Credit facility and commercial paper notes (Details)

v3.25.1
Credit facility and commercial paper notes (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Line of Credit Facility [Line Items]      
Credit facilities $ 995,000 $ 1,001,000  
Commercial paper notes 430,417,000 100,057,000  
Credit facilities | Unsecured Revolving Credit Facility, Maturing February 2025      
Line of Credit Facility [Line Items]      
Principal amount     $ 1,550,000,000
Unamortized debt issuance costs $ 9,000,000    
Term loan fee (as a percent) 1.875%    
Credit facilities | Unsecured Revolving Credit Facility, Maturing February 2025 | SOFR      
Line of Credit Facility [Line Items]      
Variable rate 1.625%    
Credit facilities | Unsecured Revolving Credit Facility, Maturing February 2025 | Prime Rate      
Line of Credit Facility [Line Items]      
Variable rate 0.625%    
Credit facilities | New Revolving Credit Facility | Additional Variable Rate      
Line of Credit Facility [Line Items]      
Variable rate 0.10%    
Credit facilities | Senior Secured Revolving Credit Agreement | Line of Credit      
Line of Credit Facility [Line Items]      
Principal amount   $ 100,000,000  
Line of Credit | Unsecured Revolving Credit Facility, Maturing February 2025 | Term Loan Facility | SOFR      
Line of Credit Facility [Line Items]      
Variable rate, maximum downward adjustment (in percent) 0.10%    
Commercial Paper | CarbonCount Green Commercial Paper Note Program      
Line of Credit Facility [Line Items]      
Principal amount $ 125,000,000    
Grace period (in days) 5 days    
Credit facility remaining no of days (in days) 397 days    
Credit facilities $ 0    
Broker fee percent (as a percent) 0.0010    
Unamortized financing costs $ 0    
Commercial Paper | Tier Three Commercial Paper Program      
Line of Credit Facility [Line Items]      
Credit facility remaining no of days (in days) 367 days    
Broker fee percent (as a percent) 0.0005    
Principal amount of standalone commercial paper notes $ 1,000,000,000    
Commercial paper notes $ 431,000,000    
Average borrowing cost (in percent) 5.23%    
Letter of Credit | CarbonCount Green Commercial Paper Note Program      
Line of Credit Facility [Line Items]      
Percentage of drawn letter of credit (as a percent) 0.01325    
Unused letter of credit capacity (as a percent) 0.35%    
Reduced percentage of letter of credit fee (as a percent) 0.0010    
Letter of Credit | CarbonCount Green Commercial Paper Note Program | SOFR | Rate component one      
Line of Credit Facility [Line Items]      
Variable rate 1.875%    
Letter of Credit | CarbonCount Green Commercial Paper Note Program | SOFR | Rate component two      
Line of Credit Facility [Line Items]      
Variable rate 0.10%