Stock-based Compensation (Summary of Weighted-average Grant-date Fair Value) (Details) - $ / shares |
12 Months Ended | ||
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Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Restricted stock | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Granted (in dollars per share) | $ 50.19 | $ 44.76 | $ 52.62 |
| Restricted stock | Consumers Energy Company | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Granted (in dollars per share) | 49.86 | 44.49 | 52.42 |
| Restricted stock units | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Granted (in dollars per share) | 56.80 | 52.43 | 50.32 |
| Restricted stock units | Consumers Energy Company | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Granted (in dollars per share) | $ 56.80 | $ 52.46 | $ 50.34 |
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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