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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020Number 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 period1,186,962 $44.56 1,138,182 $44.57 
Granted
Restricted stock512,326 45.56 490,346 45.53 
Restricted stock units15,074 49.76 14,409 49.70 
Vested
Restricted stock(551,897)30.98 (532,833)31.04 
Restricted stock units(15,234)49.24 (14,517)49.50 
Forfeited – restricted stock(329,874)51.22 (314,056)51.22 
Nonvested at end of period817,357 $51.68 781,531 $51.73 
Year Ended December 31, 2020CMS Energy, including
Consumers		Consumers
Granted
Time-lapse awards106,520 101,439 
Market-based awards123,246 118,011 
Performance-based awards123,246 118,011 
Restricted stock units13,405 12,800 
Dividends on market-based awards17,937 17,152 
Dividends on performance-based awards17,505 16,736 
Dividends on restricted stock units1,669 1,609 
Additional market-based shares based on achievement of condition71,678 68,857 
Additional performance-based shares based on achievement of condition52,194 50,140 
Total granted527,400 504,755 
Schedule of Share-based Payment Award, Restricted Stock, Valuation 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 31202020192018
Expected volatility14.2 %14.9 %16.7 %
Expected dividend yield2.4 2.8 2.8 
Risk-free rate1.6 2.5 2.1 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, 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 31202020192018
CMS Energy, including Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$45.56 $43.57 $26.49 
Restricted stock units granted49.76 50.35 41.77 
Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$45.53 $43.57 $26.51 
Restricted stock units granted49.70 51.15 42.01 
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
Presented in the following table are amounts related to restricted stock awards and restricted stock units:
In Millions
Years Ended December 31202020192018
CMS Energy, including Consumers
Fair value of shares that vested during the year$22 $26 $27 
Compensation expense recognized11 22 17 
Income tax benefit recognized3 1 1 
Consumers
Fair value of shares that vested during the year$21 $25 $26 
Compensation expense recognized10 21 16 
Income tax benefit recognized3 1 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, 2020Number 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 period1,186,962 $44.56 1,138,182 $44.57 
Granted
Restricted stock512,326 45.56 490,346 45.53 
Restricted stock units15,074 49.76 14,409 49.70 
Vested
Restricted stock(551,897)30.98 (532,833)31.04 
Restricted stock units(15,234)49.24 (14,517)49.50 
Forfeited – restricted stock(329,874)51.22 (314,056)51.22 
Nonvested at end of period817,357 $51.68 781,531 $51.73 
Year Ended December 31, 2020CMS Energy, including
Consumers		Consumers
Granted
Time-lapse awards106,520 101,439 
Market-based awards123,246 118,011 
Performance-based awards123,246 118,011 
Restricted stock units13,405 12,800 
Dividends on market-based awards17,937 17,152 
Dividends on performance-based awards17,505 16,736 
Dividends on restricted stock units1,669 1,609 
Additional market-based shares based on achievement of condition71,678 68,857 
Additional performance-based shares based on achievement of condition52,194 50,140 
Total granted527,400 504,755 
Schedule of Share-based Payment Award, Restricted Stock, Valuation 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 31202020192018
Expected volatility14.2 %14.9 %16.7 %
Expected dividend yield2.4 2.8 2.8 
Risk-free rate1.6 2.5 2.1 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, 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 31202020192018
CMS Energy, including Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$45.56 $43.57 $26.49 
Restricted stock units granted49.76 50.35 41.77 
Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$45.53 $43.57 $26.51 
Restricted stock units granted49.70 51.15 42.01 
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
Presented in the following table are amounts related to restricted stock awards and restricted stock units:
In Millions
Years Ended December 31202020192018
CMS Energy, including Consumers
Fair value of shares that vested during the year$22 $26 $27 
Compensation expense recognized11 22 17 
Income tax benefit recognized3 1 1 
Consumers
Fair value of shares that vested during the year$21 $25 $26 
Compensation expense recognized10 21 16 
Income tax benefit recognized3 1 1