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Financings and Capitalization (Tables)
 9 Months Ended
Sep. 30, 2024
Debt Instrument [Line Items]  
Schedule of Major Long-Term Debt Issuances and Retirements Presented in the following table is a summary of major long-term debt issuances during the nine months ended September 30, 2024:
Principal
(In Millions)		Interest Rate (%)Issuance DateMaturity Date
Consumers
First mortgage bonds$600 4.600 January 2024May 2029
First mortgage bonds700 4.700 August 2024January 2030
Total Consumers$1,300 
Total CMS Energy$1,300 
Presented in the following table is a summary of major long-term debt retirements during the nine months ended September 30, 2024:
Principal
(In Millions)		Interest Rate (%)Retirement DateMaturity Date
CMS Energy, parent only
Senior notes$250 3.875January 2024March 2024
Total CMS Energy, parent only$250 
Consumers
First mortgage bonds1
$250 3.125 September 2024August 2024
Total Consumers$250 
Total CMS Energy$500 
1First mortgage bonds were repaid the first business day following the maturity date, which did not fall on a business day.
Schedule of Revolving Credit Facilities The following credit facilities with banks were available at September 30, 2024:
In Millions
Expiration DateAmount of FacilityAmount BorrowedLetters of Credit OutstandingAmount Available
CMS Energy, parent only
December 14, 20271
$550 $— $30 $520 
September 30, 2025
50 — 50 — 
NorthStar Clean Energy, including subsidiaries
May 7, 20272
$150 $150 $— $— 
September 25, 20253
37 — 37 — 
Consumers4
December 14, 2027
$1,100 $— $27 $1,073 
November 18, 2025
250 — 57 193 
1There were no borrowings under this facility during the nine months ended September 30, 2024.
2Obligations under this facility are secured by certain pledged equity interests in subsidiaries of NorthStar Clean Energy; under the terms of this facility, the interests may not be sold by NorthStar Clean Energy unless there is an agreed-upon substitution for the pledged equity interests. At September 30, 2024, the net book value of the pledged equity interests was $396 million. Also under the terms of this facility, NorthStar Clean Energy may be restricted from remitting cash dividends to CMS Energy in the event of default. Loans under this facility have an interest rate of one-month Term SOFR plus 1.750 percent less an adjustment of 0.050 percent for green credit advances. At September 30, 2024, the interest rate for the loan issued under this facility was 6.795 percent.
3This letter of credit facility is available to Aviator Wind Equity Holdings. For more information regarding Aviator Wind Equity Holdings, see Note 11, Variable Interest Entities.
4Obligations under these facilities are secured by first mortgage bonds of Consumers. There were no borrowings under these facilities during the nine months ended September 30, 2024.
Consumers Energy Company  
Debt Instrument [Line Items]  
Schedule of Major Long-Term Debt Issuances and Retirements Presented in the following table is a summary of major long-term debt issuances during the nine months ended September 30, 2024:
Principal
(In Millions)		Interest Rate (%)Issuance DateMaturity Date
Consumers
First mortgage bonds$600 4.600 January 2024May 2029
First mortgage bonds700 4.700 August 2024January 2030
Total Consumers$1,300 
Total CMS Energy$1,300 
Schedule of Revolving Credit Facilities The following credit facilities with banks were available at September 30, 2024:
In Millions
Expiration DateAmount of FacilityAmount BorrowedLetters of Credit OutstandingAmount Available
CMS Energy, parent only
December 14, 20271
$550 $— $30 $520 
September 30, 2025
50 — 50 — 
NorthStar Clean Energy, including subsidiaries
May 7, 20272
$150 $150 $— $— 
September 25, 20253
37 — 37 — 
Consumers4
December 14, 2027
$1,100 $— $27 $1,073 
November 18, 2025
250 — 57 193 
1There were no borrowings under this facility during the nine months ended September 30, 2024.
2Obligations under this facility are secured by certain pledged equity interests in subsidiaries of NorthStar Clean Energy; under the terms of this facility, the interests may not be sold by NorthStar Clean Energy unless there is an agreed-upon substitution for the pledged equity interests. At September 30, 2024, the net book value of the pledged equity interests was $396 million. Also under the terms of this facility, NorthStar Clean Energy may be restricted from remitting cash dividends to CMS Energy in the event of default. Loans under this facility have an interest rate of one-month Term SOFR plus 1.750 percent less an adjustment of 0.050 percent for green credit advances. At September 30, 2024, the interest rate for the loan issued under this facility was 6.795 percent.
3This letter of credit facility is available to Aviator Wind Equity Holdings. For more information regarding Aviator Wind Equity Holdings, see Note 11, Variable Interest Entities.
4Obligations under these facilities are secured by first mortgage bonds of Consumers. There were no borrowings under these facilities during the nine months ended September 30, 2024.