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Borrowings and Other Financing Instruments, Long-Term Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net $ (37) $ (33)
Unamortized Debt Issuance Expense (53) (50)
Long-term Debt, Current Maturities (250) (300)
Long-term Debt 6,610 6,167
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 250  
Long-term Debt, Maturities, Repayments of Principal in Year Two 0  
Long-term Debt, Maturities, Repayments of Principal in Year Three 250  
Long-term Debt, Maturities, Repayments of Principal in Year Four 0  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Deferred Finance Costs, Noncurrent, Net 53 50
First Mortgage Bonds | Series Due Sept. 15, 2022 [Member]    
Debt Instrument [Line Items]    
Face amount $ 0 300
Interest rate, stated percentage (in hundredths) 2.25%  
First Mortgage Bonds | Series Due March 15, 2023 [Member]    
Debt Instrument [Line Items]    
Face amount $ 250 250
Interest rate, stated percentage (in hundredths) 2.50%  
First Mortgage Bonds | Series Due May 15, 2025 [Member]    
Debt Instrument [Line Items]    
Face amount $ 250 250
Interest rate, stated percentage (in hundredths) 2.90%  
First Mortgage Bonds | Series Due June 15, 2028 [Member]    
Debt Instrument [Line Items]    
Face amount $ 350 350
Interest rate, stated percentage (in hundredths) 3.70%  
First Mortgage Bonds | Series Due Jan. 15, 2031 [Member]    
Debt Instrument [Line Items]    
Face amount $ 375 375
Interest rate, stated percentage (in hundredths) 1.90%  
First Mortgage Bonds | Series Due Sept. 1, 2037 [Member]    
Debt Instrument [Line Items]    
Face amount $ 350 350
Interest rate, stated percentage (in hundredths) 6.25%  
First Mortgage Bonds | Series Due Aug. 1, 2038 [Member]    
Debt Instrument [Line Items]    
Face amount $ 300 300
Interest rate, stated percentage (in hundredths) 6.50%  
First Mortgage Bonds | Series Due Aug. 15, 2041 [Member]    
Debt Instrument [Line Items]    
Face amount $ 250 250
Interest rate, stated percentage (in hundredths) 4.75%  
First Mortgage Bonds | Series Due Sept. 15, 2042 [Member]    
Debt Instrument [Line Items]    
Face amount $ 500 500
Interest rate, stated percentage (in hundredths) 3.60%  
First Mortgage Bonds | Series Due March 15, 2043 [Member]    
Debt Instrument [Line Items]    
Face amount $ 250 250
Interest rate, stated percentage (in hundredths) 3.95%  
First Mortgage Bonds | Series Due March 15, 2044 [Member]    
Debt Instrument [Line Items]    
Face amount $ 300 300
Interest rate, stated percentage (in hundredths) 4.30%  
First Mortgage Bonds | Series Due June 15, 2046 [Member]    
Debt Instrument [Line Items]    
Face amount $ 250 250
Interest rate, stated percentage (in hundredths) 3.55%  
First Mortgage Bonds | Series Due June 15, 2047 [Member]    
Debt Instrument [Line Items]    
Face amount $ 400 400
Interest rate, stated percentage (in hundredths) 3.80%  
First Mortgage Bonds | Series Due June 15, 2048 [Member]    
Debt Instrument [Line Items]    
Face amount $ 350 350
Interest rate, stated percentage (in hundredths) 4.10%  
First Mortgage Bonds | Series Due September 15, 2049 [Domain]    
Debt Instrument [Line Items]    
Face amount $ 400 400
Interest rate, stated percentage (in hundredths) 4.05%  
First Mortgage Bonds | Series Due March 1, 2050 [Domain]    
Debt Instrument [Line Items]    
Face amount $ 550 550
Interest rate, stated percentage (in hundredths) 3.20%  
First Mortgage Bonds | Series Due Jan. 15, 2051 [Member]    
Debt Instrument [Line Items]    
Face amount $ 375 375
Interest rate, stated percentage (in hundredths) 2.70%  
First Mortgage Bonds | Series Due June 15, 2031    
Debt Instrument [Line Items]    
Face amount [1] $ 750 750
Interest rate, stated percentage (in hundredths) [1] 1.875%  
First Mortgage Bonds | Series Due June 1, 2032 2    
Debt Instrument [Line Items]    
Face amount [2] $ 300 0
Interest rate, stated percentage (in hundredths) [2] 4.10%  
First Mortgage Bonds | Series Due June 1, 2052    
Debt Instrument [Line Items]    
Face amount [2] $ 400 0
Interest rate, stated percentage (in hundredths) [2] 4.50%  
Long-term Debt    
Debt Instrument [Line Items]    
Long-term Debt $ 6,610 $ 6,167
[1] 2021 financing
[2] 2022 financing.