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v3.25.3

Financings and Capitalization (Major Long-Term Debt Issuances and Retirements) (Details) - USD ($) $ in Millions |  | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 01, 2035 | Jun. 30, 2026 | Sep. 30, 2025
Debt Instrument [Line Items] |  |  |
Principal Debt Issuances (In Millions) |  |  | $ 2,414
Repayments of debt |  |  | 600
Consumers Energy Company |  |  |
Debt Instrument [Line Items] |  |  |
Principal Debt Issuances (In Millions) |  |  | 1,125
First mortgage bonds | 4.500% First Mortgage Bonds Due January 2031 | Consumers Energy Company |  |  |
Debt Instrument [Line Items] |  |  |
Principal Debt Issuances (In Millions) |  |  | $ 500
Interest Rate (%) |  |  | 4.50%
First mortgage bonds | 5.050% First Mortgage Bonds Due May 2035 | Consumers Energy Company |  |  |
Debt Instrument [Line Items] |  |  |
Principal Debt Issuances (In Millions) |  |  | $ 625
Interest Rate (%) |  |  | 5.05%
CMS Energy |  |  |
Debt Instrument [Line Items] |  |  |
Principal Debt Issuances (In Millions) |  |  | $ 1,110
Repayments of debt |  |  | 600
CMS Energy | Junior subordinated notes | 6.500% Junior Subordinated Notes Due June 2055 |  |  |
Debt Instrument [Line Items] |  |  |
Principal Debt Issuances (In Millions) |  |  | $ 1,000
Interest Rate (%) |  |  | 6.50%
CMS Energy | Junior subordinated notes | 6.500% Junior Subordinated Notes Due June 2055 | Forecast |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate | 1.961% |  |
CMS Energy | Term loan facility | Term Loan Facility Due December 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Principal Debt Issuances (In Millions) |  |  | $ 110
Repayments of debt |  |  | 200
CMS Energy | Term loan facility | Term Loan Facility Due September 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of debt |  |  | 400
NorthStar Clean Energy, Including Subsidiaries |  |  |
Debt Instrument [Line Items] |  |  |
Principal Debt Issuances (In Millions) |  |  | 179
NorthStar Clean Energy, Including Subsidiaries | Construction financing agreement | Construction Financing Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Principal Debt Issuances (In Millions) |  |  | $ 179
NorthStar Clean Energy, Including Subsidiaries | Construction financing agreement | Construction Financing Agreement | Forecast |  |  |
Debt Instrument [Line Items] |  |  |
Term loan maturity |  | 5 years |

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