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Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments, Long-Term Borrowings and Other Financing Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Long-Term Borrowings and Other Financing Instruments    
Unamortized discount $ (3) $ (3)
Unamortized debt expense (8) (9)
Long-term debt, noncurrent 808 807
2020 0  
2021 19  
2022 0  
2023 0  
2024 $ 200  
Series Due Nov. 1, 2021 [Member] | City of La Crosse Resource Recovery Bond    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage 6.00%  
Debt Instrument, Face Amount $ 19 19
Series Due June 15, 2024 [Member] | First Mortgage Bonds    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
Debt Instrument, Face Amount $ 100 100
Series Due June 15, 2024 2 [Member] | First Mortgage Bonds    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
Debt Instrument, Face Amount $ 100 100
Series Due Oct. 1, 2042 [Member] | First Mortgage Bonds    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage 3.70%  
Debt Instrument, Face Amount $ 100 100
Series Due Sept. 1, 2038 [Member] | First Mortgage Bonds    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage 6.38%  
Debt Instrument, Face Amount $ 200 200
Series Due December 1, 2047 [Member] | First Mortgage Bonds    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage 3.75%  
Debt Instrument, Face Amount $ 100 100
Series Due December 1, 2048 [Member] | First Mortgage Bonds    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage [1] 4.20%  
Debt Instrument, Face Amount [1] $ 200 $ 200
[1] 2018 financing.