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Debt - Tax-Exempt Financings and Finance Leases and Other (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Debt Instrument [Line Items]        
Finance leases and other $ 400 $ 315    
ARIZONA        
Debt Instrument [Line Items]        
Finance leases and other 120      
Tax-exempt        
Debt Instrument [Line Items]        
Long-term debt 1,369 1,409    
Principal 1,378 $ 1,418    
Solid Waste Disposal Revenue Bonds        
Debt Instrument [Line Items]        
Principal $ 250   $ 50 $ 100
Debt instrument, term 10 years