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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2024
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 ConsumersConsumers
Year Ended December 31, 2024Number 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 period1,158,102 $59.50 1,094,366 $59.50 
Granted
Restricted stock606,746 44.76 562,139 44.49 
Restricted stock units26,704 52.43 25,677 52.46 
Vested
Restricted stock(467,039)45.88 (441,913)45.89 
Restricted stock units(19,350)49.62 (18,572)49.64 
Forfeited – restricted stock(142,376)42.68 (140,124)43.37 
Nonvested at end of period1,162,787 $59.34 1,081,573 $59.35 
Year Ended December 31, 2024CMS Energy, including
Consumers		Consumers
Granted
Time-lapse awards130,512 117,525 
Market-based awards165,238 153,513 
Performance-based awards176,655 164,324 
Restricted stock units22,744 21,880 
Dividends on market-based awards14,518 13,634 
Dividends on performance-based awards15,860 14,905 
Dividends on restricted stock units3,960 3,797 
Additional performance-based shares based on achievement of condition103,963 98,238 
Total granted633,450 587,816 
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 31202420232022
Expected volatility20.2 %30.3 %27.3 %
Expected dividend yield3.5 2.9 2.8 
Risk-free rate4.1 3.9 1.4 
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 31202420232022
CMS Energy, including Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$44.76 $52.62 $48.69 
Restricted stock units granted52.43 50.32 56.13 
Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$44.49 $52.42 $48.57 
Restricted stock units granted52.46 50.34 56.07 
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 31202420232022
CMS Energy, including Consumers
Fair value of shares that vested during the year$28 $20 $27 
Compensation expense recognized27 28 26 
Income tax benefit recognized3 3 — 
Consumers
Fair value of shares that vested during the year$27 $19 $25 
Compensation expense recognized25 26 25 
Income tax benefit recognized3 2 — 
Consumers Energy Company  
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 ConsumersConsumers
Year Ended December 31, 2024Number 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 period1,158,102 $59.50 1,094,366 $59.50 
Granted
Restricted stock606,746 44.76 562,139 44.49 
Restricted stock units26,704 52.43 25,677 52.46 
Vested
Restricted stock(467,039)45.88 (441,913)45.89 
Restricted stock units(19,350)49.62 (18,572)49.64 
Forfeited – restricted stock(142,376)42.68 (140,124)43.37 
Nonvested at end of period1,162,787 $59.34 1,081,573 $59.35 
Year Ended December 31, 2024CMS Energy, including
Consumers		Consumers
Granted
Time-lapse awards130,512 117,525 
Market-based awards165,238 153,513 
Performance-based awards176,655 164,324 
Restricted stock units22,744 21,880 
Dividends on market-based awards14,518 13,634 
Dividends on performance-based awards15,860 14,905 
Dividends on restricted stock units3,960 3,797 
Additional performance-based shares based on achievement of condition103,963 98,238 
Total granted633,450 587,816 
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 31202420232022
Expected volatility20.2 %30.3 %27.3 %
Expected dividend yield3.5 2.9 2.8 
Risk-free rate4.1 3.9 1.4 
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 31202420232022
CMS Energy, including Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$44.76 $52.62 $48.69 
Restricted stock units granted52.43 50.32 56.13 
Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$44.49 $52.42 $48.57 
Restricted stock units granted52.46 50.34 56.07 
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 31202420232022
CMS Energy, including Consumers
Fair value of shares that vested during the year$28 $20 $27 
Compensation expense recognized27 28 26 
Income tax benefit recognized3 3 — 
Consumers
Fair value of shares that vested during the year$27 $19 $25 
Compensation expense recognized25 26 25 
Income tax benefit recognized3 2 —