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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021Number 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 period817,357 $51.68 781,531 $51.73 
Granted
Restricted stock547,201 43.52 517,141 42.85 
Restricted stock units13,867 54.11 13,093 53.93 
Vested
Restricted stock(408,011)29.46 (388,009)29.55 
Restricted stock units(15,577)48.15 (14,891)48.09 
Forfeited – restricted stock(22,264)57.90 (21,780)58.01 
Nonvested at end of period932,573 $56.56 887,085 $56.19 
Year Ended December 31, 2021CMS Energy, including
Consumers		Consumers
Granted
Time-lapse awards118,290 112,128 
Market-based awards143,843 135,638 
Performance-based awards143,843 135,638 
Restricted stock units11,725 11,035 
Dividends on market-based awards15,661 14,890 
Dividends on performance-based awards15,964 15,175 
Dividends on restricted stock units2,142 2,058 
Additional market-based shares based on achievement of condition59,736 56,505 
Additional performance-based shares based on achievement of condition49,864 47,167 
Total granted561,068 530,234 
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 31202120202019
Expected volatility27.6 %14.2 %14.9 %
Expected dividend yield2.8 2.4 2.8 
Risk-free rate0.2 1.6 2.5 
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 31202120202019
CMS Energy, including Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$43.52 $45.56 $43.57 
Restricted stock units granted54.11 49.76 50.35 
Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$42.85 $45.53 $43.57 
Restricted stock units granted53.93 49.70 51.15 
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 31202120202019
CMS Energy, including Consumers
Fair value of shares that vested during the year$25 $22 $26 
Compensation expense recognized22 11 22 
Income tax benefit recognized1 3 1 
Consumers
Fair value of shares that vested during the year$24 $21 $25 
Compensation expense recognized21 10 21 
Income tax benefit recognized1 3 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, 2021Number 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 period817,357 $51.68 781,531 $51.73 
Granted
Restricted stock547,201 43.52 517,141 42.85 
Restricted stock units13,867 54.11 13,093 53.93 
Vested
Restricted stock(408,011)29.46 (388,009)29.55 
Restricted stock units(15,577)48.15 (14,891)48.09 
Forfeited – restricted stock(22,264)57.90 (21,780)58.01 
Nonvested at end of period932,573 $56.56 887,085 $56.19 
Year Ended December 31, 2021CMS Energy, including
Consumers		Consumers
Granted
Time-lapse awards118,290 112,128 
Market-based awards143,843 135,638 
Performance-based awards143,843 135,638 
Restricted stock units11,725 11,035 
Dividends on market-based awards15,661 14,890 
Dividends on performance-based awards15,964 15,175 
Dividends on restricted stock units2,142 2,058 
Additional market-based shares based on achievement of condition59,736 56,505 
Additional performance-based shares based on achievement of condition49,864 47,167 
Total granted561,068 530,234 
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 31202120202019
Expected volatility27.6 %14.2 %14.9 %
Expected dividend yield2.8 2.4 2.8 
Risk-free rate0.2 1.6 2.5 
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 31202120202019
CMS Energy, including Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$43.52 $45.56 $43.57 
Restricted stock units granted54.11 49.76 50.35 
Consumers
Weighted-average grant-date fair value per share
Restricted stock granted$42.85 $45.53 $43.57 
Restricted stock units granted53.93 49.70 51.15 
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 31202120202019
CMS Energy, including Consumers
Fair value of shares that vested during the year$25 $22 $26 
Compensation expense recognized22 11 22 
Income tax benefit recognized1 3 1 
Consumers
Fair value of shares that vested during the year$24 $21 $25 
Compensation expense recognized21 10 21 
Income tax benefit recognized1 3 1