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Debt and Finance Lease Obligations, Principal Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Principal Payments Due on Debt    
2025 [1] $ 499  
2026 672  
2027 564  
2028 1,047  
2029 439  
Thereafter 4,935  
Net unamortized debt issuance costs and other (71) $ (77)
Total debt $ 8,085  
[1] Maturities for 2025 include the IEnova Revolver.