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Financings and Capitalization (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 2024:
Principal
(In Millions)		Interest Rate (%)Issuance DateMaturity Date
Consumers
First Mortgage Bonds$600 4.600 January 2024May 2029
Total Consumers$600 
Presented in the following table is a summary of major long-term debt retirements during the three months ended March 31, 2024:
Principal
(In Millions)		Interest Rate (%)Retirement DateMaturity Date
CMS Energy, parent only
Senior Notes$250 3.875January 2024March 2024
CMS Energy, parent only$250 
Schedule of Revolving Credit Facilities The following credit facilities with banks were available at March 31, 2024:
In Millions
Expiration DateAmount of FacilityAmount BorrowedLetters of Credit OutstandingAmount Available
CMS Energy, parent only
December 14, 20271
$550 $— $29 $521 
September 22, 2024
50 — 50 — 
NorthStar Clean Energy, including subsidiaries
September 25, 20252
$37 $— $37 $— 
Consumers3
December 14, 2027
$1,100 $— $27 $1,073 
November 18, 2025
250 — 53 197 
1There were no borrowings under this facility during the three months ended March 31, 2024.
2This 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.
3Obligations under these facilities are secured by first mortgage bonds of Consumers. There were no borrowings under these facilities during the three months ended March 31, 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 three months ended March 31, 2024:
Principal
(In Millions)		Interest Rate (%)Issuance DateMaturity Date
Consumers
First Mortgage Bonds$600 4.600 January 2024May 2029
Total Consumers$600 
Schedule of Revolving Credit Facilities The following credit facilities with banks were available at March 31, 2024:
In Millions
Expiration DateAmount of FacilityAmount BorrowedLetters of Credit OutstandingAmount Available
CMS Energy, parent only
December 14, 20271
$550 $— $29 $521 
September 22, 2024
50 — 50 — 
NorthStar Clean Energy, including subsidiaries
September 25, 20252
$37 $— $37 $— 
Consumers3
December 14, 2027
$1,100 $— $27 $1,073 
November 18, 2025
250 — 53 197 
1There were no borrowings under this facility during the three months ended March 31, 2024.
2This 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.
3Obligations under these facilities are secured by first mortgage bonds of Consumers. There were no borrowings under these facilities during the three months ended March 31, 2024.