Stock-based Compensation (Tables)
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12 Months Ended |
Dec. 31, 2025 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Schedule of Restricted Stock Activity |
Presented in the following tables is the activity for restricted stock and restricted stock units under the PISP: | | | | | | | | | | | | | | | | | | | | | | | | | CMS Energy, including Consumers | | Consumers | | Year Ended December 31, 2025 | Number of
Shares | Weighted-average
Grant Date Fair Value
Per Share | | Number of
Shares | Weighted-average
Grant Date Fair Value
Per Share | | Nonvested at beginning of period | 1,162,787 | | | $ | 59.34 | | | 1,081,573 | | | $ | 59.35 | | | Granted | | | | | | | | | Restricted stock | 523,663 | | | 50.19 | | | 480,258 | | | 49.86 | | | Restricted stock units | 18,491 | | | 56.80 | | | 17,713 | | | 56.80 | | | Vested | | | | | | | | | Restricted stock | (450,699) | | | 46.30 | | | (424,830) | | | 46.33 | | | Restricted stock units | (27,035) | | | 51.79 | | | (25,994) | | | 51.82 | | | Forfeited – restricted stock | (38,364) | | | 60.19 | | | (36,119) | | | 60.01 | | | Nonvested at end of period | 1,188,843 | | | $ | 60.36 | | | 1,092,601 | | | $ | 60.36 | |
| | | | | | | | | | Year Ended December 31, 2025 | CMS Energy, including
Consumers | Consumers | | Granted | | | | Time-lapse awards | 118,842 | | 109,242 | | | Market-based awards | 139,248 | | 126,302 | | | Performance-based awards | 147,982 | | 134,540 | | | Restricted stock units | 14,406 | | 13,800 | | | Dividends on market-based awards | 13,484 | | 12,472 | | | Dividends on performance-based awards | 14,458 | | 13,389 | | | Dividends on restricted stock units | 4,085 | | 3,913 | | | Additional market-based shares based on achievement of condition | 5,982 | | 5,624 | | | Additional performance-based shares based on achievement of condition | 83,667 | | 78,689 | | | Total granted | 542,154 | | 497,971 | |
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| Schedule of Significant Assumptions |
Presented in the following table are the most significant assumptions used to estimate the fair value of the market-based restricted stock awards: | | | | | | | | | | | | | Years Ended December 31 | 2025 | 2024 | 2023 | | Expected volatility | 20.7 | % | 20.2 | % | 30.3 | % | | Expected dividend yield | 3.1 | | 3.5 | | 2.9 | | | Risk-free rate | 4.2 | | 4.1 | | 3.9 | |
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| Summary of Weighted-average Grant-date Fair Value |
Presented in the following table is the weighted-average grant-date fair value of all awards under the PISP: | | | | | | | | | | | | | | | | | | | | | | In Millions | | Years Ended December 31 | 2025 | 2024 | 2023 | | CMS Energy, including Consumers | | | | | | | | Weighted-average grant-date fair value per share | | | | | | | | Restricted stock granted | | $ | 50.19 | | | $ | 44.76 | | | $ | 52.62 | | | Restricted stock units granted | | 56.80 | | | 52.43 | | | 50.32 | | | Consumers | | | | | | | | Weighted-average grant-date fair value per share | | | | | | | | Restricted stock granted | | $ | 49.86 | | | $ | 44.49 | | | $ | 52.42 | | | Restricted stock units granted | | 56.80 | | | 52.46 | | | 50.34 | |
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| Schedule of Amounts Related to Restricted Stock Awards and Restricted Stock Units |
Presented in the following table are amounts related to restricted stock awards and restricted stock units: | | | | | | | | | | | | | | | | | | | | | | In Millions | | Years Ended December 31 | 2025 | 2024 | 2023 | | CMS Energy, including Consumers | | | | | | | | Fair value of shares that vested during the year | | $ | 33 | | | $ | 28 | | | $ | 20 | | | Compensation expense recognized | | 25 | | | 27 | | | 28 | | | Income tax benefit recognized | | 2 | | | 3 | | | 3 | | | Consumers | | | | | | | | Fair value of shares that vested during the year | | $ | 32 | | | $ | 27 | | | $ | 19 | | | Compensation expense recognized | | 23 | | | 25 | | | 26 | | | Income tax benefit recognized | | 2 | | | 3 | | | 2 | |
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| Consumers Energy Company |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
| Schedule of Restricted Stock Activity |
Presented in the following tables is the activity for restricted stock and restricted stock units under the PISP: | | | | | | | | | | | | | | | | | | | | | | | | | CMS Energy, including Consumers | | Consumers | | Year Ended December 31, 2025 | Number of
Shares | Weighted-average
Grant Date Fair Value
Per Share | | Number of
Shares | Weighted-average
Grant Date Fair Value
Per Share | | Nonvested at beginning of period | 1,162,787 | | | $ | 59.34 | | | 1,081,573 | | | $ | 59.35 | | | Granted | | | | | | | | | Restricted stock | 523,663 | | | 50.19 | | | 480,258 | | | 49.86 | | | Restricted stock units | 18,491 | | | 56.80 | | | 17,713 | | | 56.80 | | | Vested | | | | | | | | | Restricted stock | (450,699) | | | 46.30 | | | (424,830) | | | 46.33 | | | Restricted stock units | (27,035) | | | 51.79 | | | (25,994) | | | 51.82 | | | Forfeited – restricted stock | (38,364) | | | 60.19 | | | (36,119) | | | 60.01 | | | Nonvested at end of period | 1,188,843 | | | $ | 60.36 | | | 1,092,601 | | | $ | 60.36 | |
| | | | | | | | | | Year Ended December 31, 2025 | CMS Energy, including
Consumers | Consumers | | Granted | | | | Time-lapse awards | 118,842 | | 109,242 | | | Market-based awards | 139,248 | | 126,302 | | | Performance-based awards | 147,982 | | 134,540 | | | Restricted stock units | 14,406 | | 13,800 | | | Dividends on market-based awards | 13,484 | | 12,472 | | | Dividends on performance-based awards | 14,458 | | 13,389 | | | Dividends on restricted stock units | 4,085 | | 3,913 | | | Additional market-based shares based on achievement of condition | 5,982 | | 5,624 | | | Additional performance-based shares based on achievement of condition | 83,667 | | 78,689 | | | Total granted | 542,154 | | 497,971 | |
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| Schedule of Significant Assumptions |
Presented in the following table are the most significant assumptions used to estimate the fair value of the market-based restricted stock awards: | | | | | | | | | | | | | Years Ended December 31 | 2025 | 2024 | 2023 | | Expected volatility | 20.7 | % | 20.2 | % | 30.3 | % | | Expected dividend yield | 3.1 | | 3.5 | | 2.9 | | | Risk-free rate | 4.2 | | 4.1 | | 3.9 | |
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| Summary of Weighted-average Grant-date Fair Value |
Presented in the following table is the weighted-average grant-date fair value of all awards under the PISP: | | | | | | | | | | | | | | | | | | | | | | In Millions | | Years Ended December 31 | 2025 | 2024 | 2023 | | CMS Energy, including Consumers | | | | | | | | Weighted-average grant-date fair value per share | | | | | | | | Restricted stock granted | | $ | 50.19 | | | $ | 44.76 | | | $ | 52.62 | | | Restricted stock units granted | | 56.80 | | | 52.43 | | | 50.32 | | | Consumers | | | | | | | | Weighted-average grant-date fair value per share | | | | | | | | Restricted stock granted | | $ | 49.86 | | | $ | 44.49 | | | $ | 52.42 | | | Restricted stock units granted | | 56.80 | | | 52.46 | | | 50.34 | |
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| Schedule of Amounts Related to Restricted Stock Awards and Restricted Stock Units |
Presented in the following table are amounts related to restricted stock awards and restricted stock units: | | | | | | | | | | | | | | | | | | | | | | In Millions | | Years Ended December 31 | 2025 | 2024 | 2023 | | CMS Energy, including Consumers | | | | | | | | Fair value of shares that vested during the year | | $ | 33 | | | $ | 28 | | | $ | 20 | | | Compensation expense recognized | | 25 | | | 27 | | | 28 | | | Income tax benefit recognized | | 2 | | | 3 | | | 3 | | | Consumers | | | | | | | | Fair value of shares that vested during the year | | $ | 32 | | | $ | 27 | | | $ | 19 | | | Compensation expense recognized | | 23 | | | 25 | | | 26 | | | Income tax benefit recognized | | 2 | | | 3 | | | 2 | |
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