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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, 2021
Dec. 31, 2020
Long-Term Borrowings and Other Financing Instruments    
Unamortized discount $ (4) $ (4)
Unamortized debt expense (10) (9)
Long-term debt, noncurrent 987 887
2021 0  
2022 0  
2023 200  
2024 0  
2025 0  
NSP Wisconsin [Member]    
Long-Term Borrowings and Other Financing Instruments    
Long-term Debt, Current Maturities $ 0 (19)
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 $ 0 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 Sept. 1, 2038 [Member] | First Mortgage Bonds    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage 6.375%  
Debt Instrument, Face Amount $ 200 200
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 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 4.20%  
Debt Instrument, Face Amount $ 200 200
Series Due May 1, 2051 [Member] | First Mortgage Bonds | NSP Wisconsin [Member]    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage [1] 3.05%  
Debt Instrument, Face Amount [1] $ 100 100
Series Due May 1, 2051 2 | First Mortgage Bonds | NSP Wisconsin [Member]    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage [2] 2.82%  
Debt Instrument, Face Amount [2] $ 100 $ 0
[1] 2020 financing.
[2] 2021 financing.