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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2024
Financial Instruments [Line Items] |
Schedule of Carrying Amounts and Fair Values of Financial Instruments | For information about assets and liabilities recorded at fair value and for additional details regarding the fair value hierarchy, see Note 5, Fair Value Measurements.
In Millions
| December 31, 2024 |  | December 31, 2023
| Carrying Amount | Fair Value |  | Carrying Amount | Fair Value
| Total | Level |  | Total | Level
| 1 | 2 | 3 |  | 1 | 2 | 3
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 9 |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | 8 |  |  |  | $ | 11 |  |  | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | 11 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 2 |  | 16,386 |  |  | 14,876 |  |  | 1,018 |  |  | 11,952 |  |  | 1,906 |  |  |  | 15,483 |  |  | 14,305 |  |  | 1,103 |  |  | 11,186 |  |  | 2,016 |
Long-term payables 3 |  | 9 |  |  | 9 |  |  | — |  |  | — |  |  | 9 |  |  |  | 11 |  |  | 11 |  |  | — |  |  | — |  |  | 11 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 9 |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | 8 |  |  |  | $ | 11 |  |  | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | 11 |
Notes receivable – related party 4 |  | 94 |  |  | 94 |  |  | — |  |  | — |  |  | 94 |  |  |  | 97 |  |  | 97 |  |  | — |  |  | — |  |  | 97 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 5 |  | 11,270 |  |  | 9,940 |  |  | — |  |  | 8,034 |  |  | 1,906 |  |  |  | 10,762 |  |  | 9,757 |  |  | — |  |  | 7,741 |  |  | 2,016 |
Long-term debt – related party 6 |  | 823 |  |  | 549 |  |  | — |  |  | 549 |  |  | — |  |  |  | 424 |  |  | 303 |  |  | — |  |  | 303 |  |  | — |
Long-term payables |  | 4 |  |  | 4 |  |  | — |  |  | — |  |  | 4 |  |  |  | 5 |  |  | 5 |  |  | — |  |  | — |  |  | 5 |
1 Includes current portion of long-term accounts receivable and notes receivable of $4 million at December 31, 2024 and $6 million at December 31, 2023. 2 Includes current portion of long-term debt of $1.2 billion at December 31, 2024 and $975 million at December 31, 2023. 3 Includes current portion of long-term payables of $2 million at December 31, 2024 and December 31, 2023. 4 Includes current portion of notes receivable – related party of $7 million at December 31, 2024 and 2023. For more information on notes receivable – related party, see Note 17, Related-party Transactions—Consumers. 5 Includes current portion of long-term debt of $452 million at December 31, 2024 and $725 million at December 31, 2023. 6 For more information on CMS Energy’s repurchases of Consumers’ first mortgage bonds, see Note 4, Financings and Capitalization—CMS Energy’s Purchase of Consumers’ First Mortgage Bonds.
Consumers Energy Company |
Financial Instruments [Line Items] |
Schedule of Carrying Amounts and Fair Values of Financial Instruments | For information about assets and liabilities recorded at fair value and for additional details regarding the fair value hierarchy, see Note 5, Fair Value Measurements.
In Millions
| December 31, 2024 |  | December 31, 2023
| Carrying Amount | Fair Value |  | Carrying Amount | Fair Value
| Total | Level |  | Total | Level
| 1 | 2 | 3 |  | 1 | 2 | 3
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 9 |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | 8 |  |  |  | $ | 11 |  |  | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | 11 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 2 |  | 16,386 |  |  | 14,876 |  |  | 1,018 |  |  | 11,952 |  |  | 1,906 |  |  |  | 15,483 |  |  | 14,305 |  |  | 1,103 |  |  | 11,186 |  |  | 2,016 |
Long-term payables 3 |  | 9 |  |  | 9 |  |  | — |  |  | — |  |  | 9 |  |  |  | 11 |  |  | 11 |  |  | — |  |  | — |  |  | 11 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 9 |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | 8 |  |  |  | $ | 11 |  |  | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | 11 |
Notes receivable – related party 4 |  | 94 |  |  | 94 |  |  | — |  |  | — |  |  | 94 |  |  |  | 97 |  |  | 97 |  |  | — |  |  | — |  |  | 97 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 5 |  | 11,270 |  |  | 9,940 |  |  | — |  |  | 8,034 |  |  | 1,906 |  |  |  | 10,762 |  |  | 9,757 |  |  | — |  |  | 7,741 |  |  | 2,016 |
Long-term debt – related party 6 |  | 823 |  |  | 549 |  |  | — |  |  | 549 |  |  | — |  |  |  | 424 |  |  | 303 |  |  | — |  |  | 303 |  |  | — |
Long-term payables |  | 4 |  |  | 4 |  |  | — |  |  | — |  |  | 4 |  |  |  | 5 |  |  | 5 |  |  | — |  |  | — |  |  | 5 |
1 Includes current portion of long-term accounts receivable and notes receivable of $4 million at December 31, 2024 and $6 million at December 31, 2023. 2 Includes current portion of long-term debt of $1.2 billion at December 31, 2024 and $975 million at December 31, 2023. 3 Includes current portion of long-term payables of $2 million at December 31, 2024 and December 31, 2023. 4 Includes current portion of notes receivable – related party of $7 million at December 31, 2024 and 2023. For more information on notes receivable – related party, see Note 17, Related-party Transactions—Consumers. 5 Includes current portion of long-term debt of $452 million at December 31, 2024 and $725 million at December 31, 2023. 6 For more information on CMS Energy’s repurchases of Consumers’ first mortgage bonds, see Note 4, Financings and Capitalization—CMS Energy’s Purchase of Consumers’ First Mortgage Bonds.

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- Definition Financial Instruments [Line Items] + References No definition available. + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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