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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018 |  | 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 |  | 1,193,266 |  |  | $ | 38.48 |  |  | 1,145,122 |  |  | $ | 38.50 |
Granted |  |  |  |  |  |  |  |
Restricted stock |  | 642,390 |  |  | 26.49 |  |  | 607,749 |  |  | 26.51 |
Restricted stock units |  | 12,450 |  |  | 41.77 |  |  | 11,934 |  |  | 42.01 |
Vested |  |  |  |  |  |  |  |
Restricted stock |  | (597,636 | ) |  | 23.08 |  |  | (567,154 | ) |  | 23.15 |
Restricted stock units |  | (12,686 | ) |  | 40.99 |  |  | (12,260 | ) |  | 40.98 |
Forfeited – restricted stock |  | (26,555 | ) |  | 39.73 |  |  | (26,555 | ) |  | 39.73 |
Nonvested at end of period |  | 1,211,229 |  |  | $ | 39.70 |  |  | 1,158,836 |  |  | $ | 39.71 |
Year Ended December 31, 2018 | CMS Energy, including Consumers |  | Consumers |
Granted |  |
Time-lapse awards | 122,615 |  | 117,029 |
Market-based awards | 134,179 |  | 126,558 |
Performance-based awards | 134,179 |  | 126,558 |
Restricted stock units | 11,196 |  | 10,792 |
Dividend equivalents on market-based awards | 21,154 |  | 20,077 |
Dividend equivalents on performance-based awards | 25,925 |  | 24,583 |
Dividend equivalents on restricted stock units | 1,254 |  | 1,142 |
Additional market-based shares based on achievement of condition | 88,987 |  | 84,025 |
Additional performance-based shares based on achievement of condition | 115,351 |  | 108,919 |
Total granted | 654,840 |  | 619,683 |
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 | 2018 |  | 2017 |  | 2016 |
Expected volatility | 16.7 | % | 18.0 | % | 16.7 | %
Expected dividend yield | 2.8 |  | 3.0 |  | 3.2 |
Risk-free rate | 2.1 |  | 1.5 |  | 1.0 |
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 | 2018 |  | 2017 |  | 2016 |
CMS Energy, including Consumers |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |
Restricted stock granted |  | $ | 26.49 |  |  | $ | 28.61 |  |  | $ | 31.74 |
Restricted stock units granted |  | 41.77 |  |  | 41.98 |  |  | 39.12 |
Consumers |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |
Restricted stock granted |  | $ | 26.51 |  |  | $ | 28.67 |  |  | $ | 31.77 |
Restricted stock units granted |  | 42.01 |  |  | 41.97 |  |  | 39.12 |
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 |  | 2018 |  |  | 2017 |  |  | 2016 |
CMS Energy, including Consumers |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 27 |  |  | $ | 37 |  |  | $ | 31 |
Compensation expense recognized |  | 17 |  |  | 17 |  |  | 16 |
Income tax benefit recognized |  | 1 |  |  | 7 |  |  | 7 |
Consumers |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 26 |  |  | $ | 35 |  |  | $ | 30 |
Compensation expense recognized |  | 16 |  |  | 16 |  |  | 16 |
Income tax benefit recognized |  | 1 |  |  | 7 |  |  | 6 |
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, 2018 |  | 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 |  | 1,193,266 |  |  | $ | 38.48 |  |  | 1,145,122 |  |  | $ | 38.50 |
Granted |  |  |  |  |  |  |  |
Restricted stock |  | 642,390 |  |  | 26.49 |  |  | 607,749 |  |  | 26.51 |
Restricted stock units |  | 12,450 |  |  | 41.77 |  |  | 11,934 |  |  | 42.01 |
Vested |  |  |  |  |  |  |  |
Restricted stock |  | (597,636 | ) |  | 23.08 |  |  | (567,154 | ) |  | 23.15 |
Restricted stock units |  | (12,686 | ) |  | 40.99 |  |  | (12,260 | ) |  | 40.98 |
Forfeited – restricted stock |  | (26,555 | ) |  | 39.73 |  |  | (26,555 | ) |  | 39.73 |
Nonvested at end of period |  | 1,211,229 |  |  | $ | 39.70 |  |  | 1,158,836 |  |  | $ | 39.71 |
Year Ended December 31, 2018 | CMS Energy, including Consumers |  | Consumers |
Granted |  |
Time-lapse awards | 122,615 |  | 117,029 |
Market-based awards | 134,179 |  | 126,558 |
Performance-based awards | 134,179 |  | 126,558 |
Restricted stock units | 11,196 |  | 10,792 |
Dividend equivalents on market-based awards | 21,154 |  | 20,077 |
Dividend equivalents on performance-based awards | 25,925 |  | 24,583 |
Dividend equivalents on restricted stock units | 1,254 |  | 1,142 |
Additional market-based shares based on achievement of condition | 88,987 |  | 84,025 |
Additional performance-based shares based on achievement of condition | 115,351 |  | 108,919 |
Total granted | 654,840 |  | 619,683 |
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 | 2018 |  | 2017 |  | 2016 |
Expected volatility | 16.7 | % | 18.0 | % | 16.7 | %
Expected dividend yield | 2.8 |  | 3.0 |  | 3.2 |
Risk-free rate | 2.1 |  | 1.5 |  | 1.0 |
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 | 2018 |  | 2017 |  | 2016 |
CMS Energy, including Consumers |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |
Restricted stock granted |  | $ | 26.49 |  |  | $ | 28.61 |  |  | $ | 31.74 |
Restricted stock units granted |  | 41.77 |  |  | 41.98 |  |  | 39.12 |
Consumers |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |
Restricted stock granted |  | $ | 26.51 |  |  | $ | 28.67 |  |  | $ | 31.77 |
Restricted stock units granted |  | 42.01 |  |  | 41.97 |  |  | 39.12 |
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 |  | 2018 |  |  | 2017 |  |  | 2016 |
CMS Energy, including Consumers |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 27 |  |  | $ | 37 |  |  | $ | 31 |
Compensation expense recognized |  | 17 |  |  | 17 |  |  | 16 |
Income tax benefit recognized |  | 1 |  |  | 7 |  |  | 7 |
Consumers |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 26 |  |  | $ | 35 |  |  | $ | 30 |
Compensation expense recognized |  | 16 |  |  | 16 |  |  | 16 |
Income tax benefit recognized |  | 1 |  |  | 7 |  |  | 6 |

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