XML 68 R48.htm IDEA: XBRL DOCUMENT v3.22.0.1
Long-Term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Long-Term Borrowings and Other Financing Instruments    
Unamortized discount $ (44) $ (42)
Unamortized debt expense (62) (54)
Long-term Debt, Current Maturities 300 0
Long-term Debt 6,447 5,904
2021 300  
2022 400  
2023 0  
2024 250  
2025 0  
First Mortgage Bonds | Series Due Aug. 15, 2022 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 2.15%  
First Mortgage Bonds | Series Due May 15, 2023 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 400 400
Debt Instrument, Interest Rate, Stated Percentage 2.60%  
First Mortgage Bonds | Series Due July 1, 2025 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 7.125%  
First Mortgage Bonds | Series Due March 1, 2028 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 150 150
Debt Instrument, Interest Rate, Stated Percentage 6.50%  
First Mortgage Bonds | Series Due April 1, 2031    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [1] $ 425 0
Debt Instrument, Interest Rate, Stated Percentage [1] 2.25%  
First Mortgage Bonds | Series Due July 15, 2035 [Domain]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 5.25%  
First Mortgage Bonds | Series Due June 1, 2036 [Domain]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 400 400
Debt Instrument, Interest Rate, Stated Percentage 6.25%  
First Mortgage Bonds | Series Due July 1, 2037 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 350 350
Debt Instrument, Interest Rate, Stated Percentage 6.20%  
First Mortgage Bonds | Series Due Nov. 1, 2039 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 5.35%  
First Mortgage Bonds | Series Due Aug. 15, 2040 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 250 250
Debt Instrument, Interest Rate, Stated Percentage 4.85%  
First Mortgage Bonds | Series Due Aug. 15, 2042 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 500 500
Debt Instrument, Interest Rate, Stated Percentage 3.40%  
First Mortgage Bonds | Series Due May 15, 2044 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 4.125%  
First Mortgage Bonds | Series Due Aug. 15, 2045 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 300 300
Debt Instrument, Interest Rate, Stated Percentage 4.00%  
First Mortgage Bonds | Series Due May 15, 2046 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 350 350
Debt Instrument, Interest Rate, Stated Percentage 3.60%  
First Mortgage Bonds | Series Due Sept. 15, 2047 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 600 600
Debt Instrument, Interest Rate, Stated Percentage 3.60%  
First Mortgage Bonds | Series Due March 1, 2050 [Domain]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 600 600
Debt Instrument, Interest Rate, Stated Percentage 2.90%  
First Mortgage Bonds | Series Due June 1, 2051 [Member]    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [2] $ 700 700
Debt Instrument, Interest Rate, Stated Percentage [2] 2.60%  
First Mortgage Bonds | Series Due April 1, 2052    
Long-Term Borrowings and Other Financing Instruments    
Face Amount [1] $ 425 0
Debt Instrument, Interest Rate, Stated Percentage [1] 3.20%  
Long-term Debt    
Long-Term Borrowings and Other Financing Instruments    
Face Amount $ 3 $ 0
Letter of Credit [Member]    
Long-Term Borrowings and Other Financing Instruments    
Line of Credit Facility, Expiration Period 1 year  
[1] 2021 financing.
[2] 2020 financing.