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Fair Value of Financial Assets and Liabilities (Tables)
 6 Months Ended
Jun. 30, 2022
Fair Value Disclosures [Abstract]  
Derivative Assets and Liabilities Measured at Fair Value on a Recurring Basis by Hierarchy Level
Recurring Fair Value Measurements — Derivative assets and liabilities measured at fair value on a recurring basis were as follows:
June 30, 2022
Fair ValueFair Value Total
Netting (a)
Total (b)
(Millions of Dollars)Level 1Level 2Level 3
Current derivative assets
Natural gas commodity$— $1 $— $1 $— $1 
June 30, 2022
Fair ValueFair Value Total
Netting (a)
Total (c)
(Millions of Dollars)Level 1Level 2Level 3
Current derivative liabilities
Natural gas commodity$— $1 $— $1 $— $1 
Dec. 31, 2021
Fair ValueFair Value Total
Netting (a)
Total (b)
(Millions of Dollars)Level 1Level 2Level 3
Current derivative assets
Natural gas commodity$— $1 $— $1 $— $1 
Dec. 31, 2021
Fair ValueFair Value Total
Netting (a)
Total (c)
(Millions of Dollars)Level 1Level 2Level 3
Current derivative liabilities
Natural gas commodity$— $1 $— $1 $— $1 
(a)    NSP-Wisconsin nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2022 and Dec. 31, 2021. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.
(b)    Included in prepayments and other current assets at June 30, 2022 and Dec. 31, 2021 on the consolidated balance sheets.
(c)    Included in other current liabilities at June 30, 2022 and Dec. 31, 2021 on the consolidated balance sheets.
Carrying Amount and Fair Value of Long-term Debt
Other financial instruments for which the carrying amount did not equal fair value:
June 30, 2022Dec. 31, 2021
(Millions of Dollars)Carrying AmountFair ValueCarrying AmountFair Value
Long-term debt, including current portion$987 $949 $987 $1,143