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v3.23.1

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% |

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