Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted average interest rate of debt outstanding.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Financings and Capitalization (Major Long-Term Debt Issuances and Retirements) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Jan. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Principal (In Millions)	$ 1,210
NorthStar Clean Energy, Including Subsidiaries
Debt Instrument [Line Items]
Principal (In Millions)	85
Consumers Energy Company
Debt Instrument [Line Items]
Principal (In Millions)	1,125
Term loan facility \| Term Loan Facility Due 2023 \| NorthStar Clean Energy, Including Subsidiaries
Debt Instrument [Line Items]
Principal (In Millions)	$ 85
Interest rate	5.806%
Maximum borrowing capacity			$ 185
Total principal amount outstanding	$ 185
Term loan facility \| Term Loan Facility Due 2024
Debt Instrument [Line Items]
Principal (In Millions)	1,000
First mortgage bonds \| 4.650% First Mortgage Bonds Due March 2028 \| Consumers Energy Company
Debt Instrument [Line Items]
Principal (In Millions)	$ 425
Interest rate	4.65%
First mortgage bonds \| 4.625% First Mortgage Bonds Due May 2033 \| Consumers Energy Company
Debt Instrument [Line Items]
Principal (In Millions)	$ 700
Interest rate	4.625%
First mortgage bonds \| 5.251% First Mortgage Bonds \| Consumers Energy Company
Debt Instrument [Line Items]
Principal (In Millions)		$ 400
Weighted average interest rate		5.251%