Financings and Capitalization (Schedule of Revolving Credit Facilities) (Details)	12 Months Ended
Dec. 31, 2021 USD ($)
Consumers Energy Company \| Revolving Credit Facilities June 5, 2024
Line of Credit Facility [Line Items]
Amount of Facility	$ 850,000,000
Amount Borrowed	0
Letters of Credit Outstanding	12,000,000
Amount Available	838,000,000
Consumers Energy Company \| Revolving Credit Facilities November 19, 2023
Line of Credit Facility [Line Items]
Amount of Facility	250,000,000
Amount Borrowed	0
Letters of Credit Outstanding	8,000,000
Amount Available	242,000,000
Consumers Energy Company \| Revolving Credit Facilities April 18, 2022
Line of Credit Facility [Line Items]
Amount of Facility	30,000,000
Amount Borrowed	0
Letters of Credit Outstanding	30,000,000
Amount Available	0
CMS Energy \| Revolving Credit Facilities June 5, 2024
Line of Credit Facility [Line Items]
Amount of Facility	550,000,000
Amount Borrowed	0
Letters of Credit Outstanding	24,000,000
Amount Available	526,000,000
CMS Energy \| Revolving Credit Facilities September 23, 2022
Line of Credit Facility [Line Items]
Amount of Facility	31,000,000
Amount Borrowed	0
Letters of Credit Outstanding	31,000,000
Amount Available	0
CMS Energy \| Revolving Credit Facilities September 23, 2022 \| Letter of Credit
Line of Credit Facility [Line Items]
Amount of Facility	50,000,000
CMS Enterprises Including Subsidiaries \| Revolving Credit Facilities September 25, 2025
Line of Credit Facility [Line Items]
Amount of Facility	39,000,000
Amount Borrowed	0
Letters of Credit Outstanding	39,000,000
Amount Available	0
CMS Enterprises Including Subsidiaries \| Revolving Credit Facilities September 30, 2025
Line of Credit Facility [Line Items]
Amount of Facility	18,000,000
Amount Borrowed	0
Letters of Credit Outstanding	8,000,000
Amount Available	10,000,000
Letter of Credit \| Consumers Energy Company
Line of Credit Facility [Line Items]
Borrowings	0
Letter of Credit \| CMS Energy \| Revolving Credit Facilities June 5, 2024
Line of Credit Facility [Line Items]
Borrowings	0
Letter of Credit \| CMS Enterprises Including Subsidiaries \| Revolving Credit Facilities September 30, 2025
Line of Credit Facility [Line Items]
Amount Available	8,000,000
Borrowings	$ 0

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

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Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

+ Details

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Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Balance Type:	credit
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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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