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REGULATORY ENVIRONMENT - 2023 MGU RATE CASE (Details) - MichiganPublicServiceCommissionMPSC - MGU $ in Millions	1 Months Ended
	Mar. 31, 2023 USD ($)
Public Utilities, General Disclosures [Line Items]
Requested rate increase	$ 19.1
Requested rate increase (as a percent)	9.10%
Requested return on equity (as a percent)	10.40%
Requested common equity component average (as a percent)	51.40%
Requested extension of rider	2 years

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Percentage of public utility's requested equity to capital, including debt and equity.

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Amount of public utility's requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested return on equity.

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Requested number of years that MGU's Main Replacement Project (MRP) rider will be extended

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