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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2023
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, 2023Number 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 period1,029,523 $60.13 978,146 $60.15 
Granted
Restricted stock502,039 52.62 474,917 52.42 
Restricted stock units19,082 50.32 18,315 50.34 
Vested
Restricted stock(313,344)51.54 (302,177)51.48 
Restricted stock units(15,211)52.60 (14,523)52.55 
Forfeited – restricted stock(63,987)53.57 (60,312)53.45 
Nonvested at end of period1,158,102 $59.50 1,094,366 $59.50 
Year Ended December 31, 2023CMS Energy, including
Consumers		Consumers
Granted
Time-lapse awards115,591 108,216 
Market-based awards147,453 139,255 
Performance-based awards153,383 145,008 
Restricted stock units15,545 14,925 
Dividends on market-based awards14,825 14,038 
Dividends on performance-based awards15,608 14,787 
Dividends on restricted stock units3,537 3,390 
Additional performance-based shares based on achievement of condition55,179 53,613 
Total granted521,121 493,232 
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 31202320222021
Expected volatility30.3 %27.3 %27.6 %
Expected dividend yield2.9 2.8 2.8 
Risk-free rate3.9 1.4 0.2 
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 31202320222021
CMS Energy, including Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$52.62 $48.69 $43.52 
Restricted stock units granted50.32 56.13 54.11 
Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$52.42 $48.57 $42.85 
Restricted stock units granted50.34 56.07 53.93 
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 31202320222021
CMS Energy, including Consumers
Fair value of shares that vested during the year$20 $27 $25 
Compensation expense recognized28 26 22 
Income tax benefit recognized3 — 1 
Consumers
Fair value of shares that vested during the year$19 $25 $24 
Compensation expense recognized26 25 21 
Income tax benefit recognized2 — 1 
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, 2023Number 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 period1,029,523 $60.13 978,146 $60.15 
Granted
Restricted stock502,039 52.62 474,917 52.42 
Restricted stock units19,082 50.32 18,315 50.34 
Vested
Restricted stock(313,344)51.54 (302,177)51.48 
Restricted stock units(15,211)52.60 (14,523)52.55 
Forfeited – restricted stock(63,987)53.57 (60,312)53.45 
Nonvested at end of period1,158,102 $59.50 1,094,366 $59.50 
Year Ended December 31, 2023CMS Energy, including
Consumers		Consumers
Granted
Time-lapse awards115,591 108,216 
Market-based awards147,453 139,255 
Performance-based awards153,383 145,008 
Restricted stock units15,545 14,925 
Dividends on market-based awards14,825 14,038 
Dividends on performance-based awards15,608 14,787 
Dividends on restricted stock units3,537 3,390 
Additional performance-based shares based on achievement of condition55,179 53,613 
Total granted521,121 493,232 
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 31202320222021
Expected volatility30.3 %27.3 %27.6 %
Expected dividend yield2.9 2.8 2.8 
Risk-free rate3.9 1.4 0.2 
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 31202320222021
CMS Energy, including Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$52.62 $48.69 $43.52 
Restricted stock units granted50.32 56.13 54.11 
Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$52.42 $48.57 $42.85 
Restricted stock units granted50.34 56.07 53.93 
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 31202320222021
CMS Energy, including Consumers
Fair value of shares that vested during the year$20 $27 $25 
Compensation expense recognized28 26 22 
Income tax benefit recognized3 — 1 
Consumers
Fair value of shares that vested during the year$19 $25 $24 
Compensation expense recognized26 25 21 
Income tax benefit recognized2 — 1