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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2025
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 4, Fair Value Measurements.
In Millions
| June 30, 2025 |  | December 31, 2024
| 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 |  | $ | 7 |  |  | $ | 7 |  |  | $ | — |  |  | $ | — |  |  | $ | 7 |  |  |  | $ | 9 |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | 8 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 2 |  | 17,901 |  |  | 16,678 |  |  | 1,981 |  |  | 12,768 |  |  | 1,929 |  |  |  | 16,386 |  |  | 14,876 |  |  | 1,018 |  |  | 11,952 |  |  | 1,906 |
Long-term payables 3 |  | 8 |  |  | 8 |  |  | — |  |  | — |  |  | 8 |  |  |  | 9 |  |  | 9 |  |  | — |  |  | — |  |  | 9 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 7 |  |  | $ | 7 |  |  | $ | — |  |  | $ | — |  |  | $ | 7 |  |  |  | $ | 9 |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | 8 |
Notes receivable – related party 4 |  | 92 |  |  | 92 |  |  | — |  |  | — |  |  | 92 |  |  |  | 94 |  |  | 94 |  |  | — |  |  | — |  |  | 94 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 5 |  | 12,151 |  |  | 11,067 |  |  | — |  |  | 9,138 |  |  | 1,929 |  |  |  | 11,270 |  |  | 9,940 |  |  | — |  |  | 8,034 |  |  | 1,906 |
Long-term debt – related party 6 |  | 1,004 |  |  | 662 |  |  | — |  |  | 662 |  |  | — |  |  |  | 823 |  |  | 549 |  |  | — |  |  | 549 |  |  | — |
Long-term payables |  | 3 |  |  | 3 |  |  | — |  |  | — |  |  | 3 |  |  |  | 4 |  |  | 4 |  |  | — |  |  | — |  |  | 4 |
1 Includes current portion of long-term accounts receivable and notes receivable of $3 million at June 30, 2025 and $4 million at December 31, 2024. 2 Includes current portion of long-term debt of $1.1 billion at June 30, 2025 and $1.2 billion at December 31, 2024. 3 Includes current portion of long-term payables of $1 million at June 30, 2025 and $2 million at December 31, 2024. 4 Includes current portion of notes receivable – related party of $7 million at June 30, 2025 and December 31, 2024. 5 Includes current portion of long-term debt of $570 million at June 30, 2025 and $452 million at December 31, 2024. 6 For more information on CMS Energy’s repurchases of Consumers’ first mortgage bonds, see Note 3, 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 4, Fair Value Measurements.
In Millions
| June 30, 2025 |  | December 31, 2024
| 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 |  | $ | 7 |  |  | $ | 7 |  |  | $ | — |  |  | $ | — |  |  | $ | 7 |  |  |  | $ | 9 |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | 8 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 2 |  | 17,901 |  |  | 16,678 |  |  | 1,981 |  |  | 12,768 |  |  | 1,929 |  |  |  | 16,386 |  |  | 14,876 |  |  | 1,018 |  |  | 11,952 |  |  | 1,906 |
Long-term payables 3 |  | 8 |  |  | 8 |  |  | — |  |  | — |  |  | 8 |  |  |  | 9 |  |  | 9 |  |  | — |  |  | — |  |  | 9 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 7 |  |  | $ | 7 |  |  | $ | — |  |  | $ | — |  |  | $ | 7 |  |  |  | $ | 9 |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | 8 |
Notes receivable – related party 4 |  | 92 |  |  | 92 |  |  | — |  |  | — |  |  | 92 |  |  |  | 94 |  |  | 94 |  |  | — |  |  | — |  |  | 94 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 5 |  | 12,151 |  |  | 11,067 |  |  | — |  |  | 9,138 |  |  | 1,929 |  |  |  | 11,270 |  |  | 9,940 |  |  | — |  |  | 8,034 |  |  | 1,906 |
Long-term debt – related party 6 |  | 1,004 |  |  | 662 |  |  | — |  |  | 662 |  |  | — |  |  |  | 823 |  |  | 549 |  |  | — |  |  | 549 |  |  | — |
Long-term payables |  | 3 |  |  | 3 |  |  | — |  |  | — |  |  | 3 |  |  |  | 4 |  |  | 4 |  |  | — |  |  | — |  |  | 4 |
1 Includes current portion of long-term accounts receivable and notes receivable of $3 million at June 30, 2025 and $4 million at December 31, 2024. 2 Includes current portion of long-term debt of $1.1 billion at June 30, 2025 and $1.2 billion at December 31, 2024. 3 Includes current portion of long-term payables of $1 million at June 30, 2025 and $2 million at December 31, 2024. 4 Includes current portion of notes receivable – related party of $7 million at June 30, 2025 and December 31, 2024. 5 Includes current portion of long-term debt of $570 million at June 30, 2025 and $452 million at December 31, 2024. 6 For more information on CMS Energy’s repurchases of Consumers’ first mortgage bonds, see Note 3, Financings and Capitalization—CMS Energy’s Purchase of Consumers’ First Mortgage Bonds.

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