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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019 |  | 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 |  | 1,211,229 |  |  | $ | 39.70 |  |  | 1,158,836 |  |  | $ | 39.71 |
Granted |  |  |  |  |  |  |  |
Restricted stock |  | 488,594 |  |  | 43.57 |  |  | 464,485 |  |  | 43.57 |
Restricted stock units |  | 14,899 |  |  | 50.35 |  |  | 14,050 |  |  | 51.15 |
Vested |  |  |  |  |  |  |  |
Restricted stock |  | (468,308 | ) |  | 31.09 |  |  | (447,214 | ) |  | 31.11 |
Restricted stock units |  | (12,503 | ) |  | 41.59 |  |  | (11,836 | ) |  | 42.35 |
Forfeited – restricted stock |  | (46,949 | ) |  | 45.81 |  |  | (40,139 | ) |  | 45.69 |
Nonvested at end of period |  | 1,186,962 |  |  | $ | 44.56 |  |  | 1,138,182 |  |  | $ | 44.57 |
Year Ended December 31, 2019 | CMS Energy, including Consumers |  | Consumers |
Granted |  |
Time-lapse awards | 119,167 |  | 113,627 |
Market-based awards | 144,963 |  | 137,636 |
Performance-based awards | 144,963 |  | 137,636 |
Director restricted stock units | 13,575 |  | 13,005 |
Dividend equivalents on market-based awards | 12,779 |  | 12,176 |
Dividend equivalents on performance-based awards | 15,899 |  | 15,145 |
Dividend equivalents on restricted stock units | 1,324 |  | 1,045 |
Additional market-based shares based on achievement of condition | 15,320 |  | 14,550 |
Additional performance-based shares based on achievement of condition | 35,503 |  | 33,715 |
Total granted | 503,493 |  | 478,535 |
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions | Presented in the following table are the most important assumptions used to estimate the fair value of the market-based restricted stock awards:
Years Ended December 31 | 2019 |  | 2018 |  | 2017 |
Expected volatility | 14.9 | % | 16.7 | % | 18.0 | %
Expected dividend yield | 2.8 |  | 2.8 |  | 3.0 |
Risk-free rate | 2.5 |  | 2.1 |  | 1.5 |
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:
Years Ended December 31 | 2019 |  | 2018 |  | 2017 |
CMS Energy, including Consumers |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |
Restricted stock granted |  | $ | 43.57 |  |  | $ | 26.49 |  |  | $ | 28.61 |
Restricted stock units granted |  | 50.35 |  |  | 41.77 |  |  | 41.98 |
Consumers |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |
Restricted stock granted |  | $ | 43.57 |  |  | $ | 26.51 |  |  | $ | 28.67 |
Restricted stock units granted |  | 51.15 |  |  | 42.01 |  |  | 41.97 |
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 |  | 2019 |  |  | 2018 |  |  | 2017 |
CMS Energy, including Consumers |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 26 |  |  | $ | 27 |  |  | $ | 37 |
Compensation expense recognized |  | 22 |  |  | 17 |  |  | 17 |
Income tax benefit recognized |  | 1 |  |  | 1 |  |  | 7 |
Consumers |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 25 |  |  | $ | 26 |  |  | $ | 35 |
Compensation expense recognized |  | 21 |  |  | 16 |  |  | 16 |
Income tax benefit recognized |  | 1 |  |  | 1 |  |  | 7 |
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, 2019 |  | 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 |  | 1,211,229 |  |  | $ | 39.70 |  |  | 1,158,836 |  |  | $ | 39.71 |
Granted |  |  |  |  |  |  |  |
Restricted stock |  | 488,594 |  |  | 43.57 |  |  | 464,485 |  |  | 43.57 |
Restricted stock units |  | 14,899 |  |  | 50.35 |  |  | 14,050 |  |  | 51.15 |
Vested |  |  |  |  |  |  |  |
Restricted stock |  | (468,308 | ) |  | 31.09 |  |  | (447,214 | ) |  | 31.11 |
Restricted stock units |  | (12,503 | ) |  | 41.59 |  |  | (11,836 | ) |  | 42.35 |
Forfeited – restricted stock |  | (46,949 | ) |  | 45.81 |  |  | (40,139 | ) |  | 45.69 |
Nonvested at end of period |  | 1,186,962 |  |  | $ | 44.56 |  |  | 1,138,182 |  |  | $ | 44.57 |
Year Ended December 31, 2019 | CMS Energy, including Consumers |  | Consumers |
Granted |  |
Time-lapse awards | 119,167 |  | 113,627 |
Market-based awards | 144,963 |  | 137,636 |
Performance-based awards | 144,963 |  | 137,636 |
Director restricted stock units | 13,575 |  | 13,005 |
Dividend equivalents on market-based awards | 12,779 |  | 12,176 |
Dividend equivalents on performance-based awards | 15,899 |  | 15,145 |
Dividend equivalents on restricted stock units | 1,324 |  | 1,045 |
Additional market-based shares based on achievement of condition | 15,320 |  | 14,550 |
Additional performance-based shares based on achievement of condition | 35,503 |  | 33,715 |
Total granted | 503,493 |  | 478,535 |
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions | Presented in the following table are the most important assumptions used to estimate the fair value of the market-based restricted stock awards:
Years Ended December 31 | 2019 |  | 2018 |  | 2017 |
Expected volatility | 14.9 | % | 16.7 | % | 18.0 | %
Expected dividend yield | 2.8 |  | 2.8 |  | 3.0 |
Risk-free rate | 2.5 |  | 2.1 |  | 1.5 |
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:
Years Ended December 31 | 2019 |  | 2018 |  | 2017 |
CMS Energy, including Consumers |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |
Restricted stock granted |  | $ | 43.57 |  |  | $ | 26.49 |  |  | $ | 28.61 |
Restricted stock units granted |  | 50.35 |  |  | 41.77 |  |  | 41.98 |
Consumers |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |
Restricted stock granted |  | $ | 43.57 |  |  | $ | 26.51 |  |  | $ | 28.67 |
Restricted stock units granted |  | 51.15 |  |  | 42.01 |  |  | 41.97 |
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 |  | 2019 |  |  | 2018 |  |  | 2017 |
CMS Energy, including Consumers |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 26 |  |  | $ | 27 |  |  | $ | 37 |
Compensation expense recognized |  | 22 |  |  | 17 |  |  | 17 |
Income tax benefit recognized |  | 1 |  |  | 1 |  |  | 7 |
Consumers |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 25 |  |  | $ | 26 |  |  | $ | 35 |
Compensation expense recognized |  | 21 |  |  | 16 |  |  | 16 |
Income tax benefit recognized |  | 1 |  |  | 1 |  |  | 7 |

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