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Long-term Debt Schedule of Long Term Debt Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
First Mortgage Bonds, rates range from 1.82% to 6.88%, with a weighted average rate of 4.09% in 2022 and 4.11% in 2021, due at various dates through 2051 $ 4,250 $ 3,880
Other Loans Payable, Long-Term, Noncurrent 170 0
Pollution Control Revenue Bonds, rates at 2.13% and 2.38%, due 2033 119 119
Total long-term debt 4,539 3,999
Less: Unamortized debt expense (15) (14)
Less: current portion of long-term debt (170) (80)
Long-term debt, net of current portion $ 4,354 $ 3,905
First mortgage Bonds - minimum rate 1.82%  
First Mortgage Bonds - maximum rate 6.88%  
Debt, Weighted Average Interest Rate 4.52% 4.32%