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Stock-Based Compensation (Tables) | 12 Months Ended
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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 Consumers |  | Consumers
Year Ended December 31, 2020 | 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 | 1,186,962 |  |  | $ | 44.56 |  |  | 1,138,182 |  |  | $ | 44.57 |
Granted |  |  |  |  |  |  |
Restricted stock | 512,326 |  |  | 45.56 |  |  | 490,346 |  |  | 45.53 |
Restricted stock units | 15,074 |  |  | 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 period | 817,357 |  |  | $ | 51.68 |  |  | 781,531 |  |  | $ | 51.73 |
Year Ended December 31, 2020 | CMS Energy, including Consumers | Consumers
Granted |  |
Time-lapse awards | 106,520 |  | 101,439 |
Market-based awards | 123,246 |  | 118,011 |
Performance-based awards | 123,246 |  | 118,011 |
Restricted stock units | 13,405 |  | 12,800 |
Dividends on market-based awards | 17,937 |  | 17,152 |
Dividends on performance-based awards | 17,505 |  | 16,736 |
Dividends on restricted stock units | 1,669 |  | 1,609 |
Additional market-based shares based on achievement of condition | 71,678 |  | 68,857 |
Additional performance-based shares based on achievement of condition | 52,194 |  | 50,140 |
Total granted | 527,400 |  | 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 31 | 2020 | 2019 | 2018
Expected volatility | 14.2 | % | 14.9 | % | 16.7 | %
Expected dividend yield | 2.4 |  | 2.8 |  | 2.8 |
Risk-free rate | 1.6 |  | 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 31 | 2020 | 2019 | 2018
CMS Energy, including Consumers |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |
Restricted stock granted |  | $ | 45.56 |  |  | $ | 43.57 |  |  | $ | 26.49 |
Restricted stock units granted |  | 49.76 |  |  | 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 granted |  | 49.70 |  |  | 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 31 | 2020 | 2019 | 2018
CMS Energy, including Consumers |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 22 |  |  | $ | 26 |  |  | $ | 27 |
Compensation expense recognized |  | 11 |  |  | 22 |  |  | 17 |
Income tax benefit recognized |  | 3 |  |  | 1 |  |  | 1 |
Consumers |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 21 |  |  | $ | 25 |  |  | $ | 26 |
Compensation expense recognized |  | 10 |  |  | 21 |  |  | 16 |
Income tax benefit recognized |  | 3 |  |  | 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 Consumers |  | Consumers
Year Ended December 31, 2020 | 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 | 1,186,962 |  |  | $ | 44.56 |  |  | 1,138,182 |  |  | $ | 44.57 |
Granted |  |  |  |  |  |  |
Restricted stock | 512,326 |  |  | 45.56 |  |  | 490,346 |  |  | 45.53 |
Restricted stock units | 15,074 |  |  | 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 period | 817,357 |  |  | $ | 51.68 |  |  | 781,531 |  |  | $ | 51.73 |
Year Ended December 31, 2020 | CMS Energy, including Consumers | Consumers
Granted |  |
Time-lapse awards | 106,520 |  | 101,439 |
Market-based awards | 123,246 |  | 118,011 |
Performance-based awards | 123,246 |  | 118,011 |
Restricted stock units | 13,405 |  | 12,800 |
Dividends on market-based awards | 17,937 |  | 17,152 |
Dividends on performance-based awards | 17,505 |  | 16,736 |
Dividends on restricted stock units | 1,669 |  | 1,609 |
Additional market-based shares based on achievement of condition | 71,678 |  | 68,857 |
Additional performance-based shares based on achievement of condition | 52,194 |  | 50,140 |
Total granted | 527,400 |  | 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 31 | 2020 | 2019 | 2018
Expected volatility | 14.2 | % | 14.9 | % | 16.7 | %
Expected dividend yield | 2.4 |  | 2.8 |  | 2.8 |
Risk-free rate | 1.6 |  | 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 31 | 2020 | 2019 | 2018
CMS Energy, including Consumers |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |
Restricted stock granted |  | $ | 45.56 |  |  | $ | 43.57 |  |  | $ | 26.49 |
Restricted stock units granted |  | 49.76 |  |  | 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 granted |  | 49.70 |  |  | 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 31 | 2020 | 2019 | 2018
CMS Energy, including Consumers |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 22 |  |  | $ | 26 |  |  | $ | 27 |
Compensation expense recognized |  | 11 |  |  | 22 |  |  | 17 |
Income tax benefit recognized |  | 3 |  |  | 1 |  |  | 1 |
Consumers |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 21 |  |  | $ | 25 |  |  | $ | 26 |
Compensation expense recognized |  | 10 |  |  | 21 |  |  | 16 |
Income tax benefit recognized |  | 3 |  |  | 1 |  |  | 1 |

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