XML 57 R44.htm IDEA: XBRL DOCUMENT v3.22.4
Long-Term Borrowings and Other Financing Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Long-Term Borrowings and Other Financing Instruments    
Unamortized discount $ (3) $ (4)
Unamortized debt expense (11) (10)
Long-term debt, noncurrent 1,086 987
2023 0  
2024 200  
2025 0  
2026 0  
2027 $ 0  
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 3.05%  
Debt Instrument, Face Amount $ 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 [1] 2.82%  
Debt Instrument, Face Amount [1] $ 100 100
Series Due Sept. 15, 2052 | First Mortgage Bonds | NSP Wisconsin [Member]    
Long-Term Borrowings and Other Financing Instruments    
Debt Instrument, Interest Rate, Stated Percentage [2] 4.86%  
Debt Instrument, Face Amount [2] $ 100 $ 0
[1] 2021 financing.
[2] 2022 financing.