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Long-Term Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net $ (9) $ (10)
Unamortized Debt Issuance Expense (28) (26)
Long-term Debt, Excluding Current Maturities 3,013 2,764
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 0  
Long-term Debt, Maturities, Repayments of Principal in Year Two 0  
Long-term Debt, Maturities, Repayments of Principal in Year Three 350  
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 $ 28 26
First Mortgage Bonds, Series due: | Series Due June 15, 2024 [Member]    
Debt Instrument [Line Items]    
Interest Rate, Stated Percentage (in hundredths) 3.30%  
Face Amount $ 150 150
First Mortgage Bonds, Series due: | Series Due June 15, 2024 2 [Member]    
Debt Instrument [Line Items]    
Interest Rate, Stated Percentage (in hundredths) 3.30%  
Face Amount $ 200 200
First Mortgage Bonds, Series due: | Series Due Aug. 15, 2041 [Member]    
Debt Instrument [Line Items]    
Interest Rate, Stated Percentage (in hundredths) 4.50%  
Face Amount $ 200 200
First Mortgage Bonds, Series due: | Series Due Aug. 15, 2041 2 [Member]    
Debt Instrument [Line Items]    
Interest Rate, Stated Percentage (in hundredths) 4.50%  
Face Amount $ 100 100
First Mortgage Bonds, Series due: | Series Due Aug. 15, 2041 3 [Member]    
Debt Instrument [Line Items]    
Interest Rate, Stated Percentage (in hundredths) 4.50%  
Face Amount $ 100 100
First Mortgage Bonds, Series due: | Series Due August 15, 2046 [Member]    
Debt Instrument [Line Items]    
Interest Rate, Stated Percentage (in hundredths) 3.40%  
Face Amount $ 300 300
First Mortgage Bonds, Series due: | Series Due August 15, 2047 [Member]    
Debt Instrument [Line Items]    
Interest Rate, Stated Percentage (in hundredths) 3.70%  
Face Amount $ 450 450
First Mortgage Bonds, Series due: | Series Due Nov. 15, 2048 [Member]    
Debt Instrument [Line Items]    
Interest Rate, Stated Percentage (in hundredths) 4.40%  
Face Amount $ 300 300
First Mortgage Bonds, Series due: | Series Due June 15, 2049 [Domain]    
Debt Instrument [Line Items]    
Interest Rate, Stated Percentage (in hundredths) 3.75%  
Face Amount $ 300 300
First Mortgage Bonds, Series due: | Series due May 1, 2050 [Member]    
Debt Instrument [Line Items]    
Interest Rate, Stated Percentage (in hundredths) [1] 3.15%  
Face Amount [1] $ 350 350
First Mortgage Bonds, Series due: | Series due May 1, 2050 2    
Debt Instrument [Line Items]    
Interest Rate, Stated Percentage (in hundredths) [2] 3.15%  
Face Amount [2] $ 250 0
Unsecured Debt [Member] | Senior C and D Due Oct. 1, 2033 [Member]    
Debt Instrument [Line Items]    
Interest Rate, Stated Percentage (in hundredths) 6.00%  
Face Amount $ 100 100
Unsecured Debt [Member] | Senior F Due Oct. 1, 2036 [Member]    
Debt Instrument [Line Items]    
Interest Rate, Stated Percentage (in hundredths) 6.00%  
Face Amount $ 250 250
Long-term Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Excluding Current Maturities $ 3,013 $ 2,764
[1] 2020 financing
[2] 2020 financing re-opened in 2021