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Debt - Maturities for long-term debt and finance lease obligations and debt outstanding (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Maturities for long-term debt    
Total Long-term debt $ 12,643,088 $ 12,096,552
Maturities for finance leases    
2025 14,949  
2026 14,949  
2027 14,949  
2028 3,052  
2029 3,052  
Maturities for contractual obligations    
2025 398,979  
2026 347,572  
2027 324,904  
2028 357,638  
2029 $ 405,046  
Weighted average interest rate on short-term borrowings (as a percent) 4.80% 5.72%
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal $ 12,388,625 $ 12,096,552
Long-term debt    
Maturities for long-term debt    
2025 388,566  
2026 335,977  
2027 311,992  
2028 355,485  
2029 $ 402,649  
Maturities for contractual obligations    
Weighted average interest rate on long-term debt 3.95% 3.89%
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal $ 12,388,625 $ 12,096,552
Unamortized Debt Issuance Costs and Debt Discounts 120,328 120,560
Finance Leases    
Maturities for finance leases    
2025 10,413  
2026 11,595  
2027 12,912  
2028 2,153  
2029 2,397  
FFB | Long-term debt    
Maturities for long-term debt    
2025 285,536  
2026 273,477  
2027 249,492  
2028 292,985  
2029 340,149  
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal 6,846,935 6,841,352
Unamortized Debt Issuance Costs and Debt Discounts 48,947 51,083
FMBs | Long-term debt    
Maturities for long-term debt    
2025 62,500  
2026 62,500  
2027 62,500  
2028 62,500  
2029 62,500  
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal 4,837,500 4,551,010
Unamortized Debt Issuance Costs and Debt Discounts 63,373 60,987
PCRBs | Long-term debt    
Maturities for long-term debt    
2025 40,530  
2026 0  
2027 0  
2028 0  
2029 0  
Total Long-term debt 40,530  
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal 704,190 704,190
Unamortized Debt Issuance Costs and Debt Discounts $ 8,008 $ 8,490