Recurring Fair Value Measurement (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Prepayments and other		$ 11	$ 7
Other Liabilities, Noncurrent		$ 43	$ 46
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Assets, Current	Assets, Current
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other Liabilities, Current	Other Liabilities, Current
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity Contract
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross	[1]	$ 2	$ 1
Netting	[1],[2]	0	0
Derivative Asset, Net	[1]	2	1
Derivative Liability, Fair Value, Gross Liability	[3]	1	1
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[2],[3]	0	0
Derivative Liability	[3]	1	1
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity Contract | Level 1
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross	[1]	0	0
Derivative Liability, Fair Value, Gross Liability	[3]	0	0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity Contract | Level 2
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross	[1]	2	1
Derivative Liability, Fair Value, Gross Liability	[3]	1	1
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity Contract | Level 3
Derivatives, Fair Value [Line Items]
Derivative Asset, Gross	[1]	0	0
Derivative Liability, Fair Value, Gross Liability	[3]	$ 0	$ 0

[1] Included in prepayments and other current assets at Dec. 31, 2022 and Dec. 31, 2021 on the consolidated balance sheet.

[2] NSP-Wisconsin nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement. Counterparty netting excludes settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

[3] Included in other current liabilities at Dec. 31, 2022 and Dec. 31, 2021 on the consolidated balance sheet.