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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
Schedule of Share-based Compensation, Restricted Stock Units Award Activity |
Year Ended December 31, 2013 | Number of Shares | Weighted-Average Grant Date Fair Value per Share |
CMS Energy, including Consumers |  |  |  |  |
Nonvested at beginning of period | 1,654,776 |  | $ | 19.15 |
Granted 1 | 920,587 |  |  | 16.65 |
Vested | (927,164) |  |  | 10.85 |
Forfeited | (22,343) |  |  | 22.33 |
Nonvested at end of period | 1,625,856 |  | $ | 22.42 |
Consumers |  |  |  |  |
Nonvested at beginning of period | 1,547,123 |  | $ | 19.22 |
Granted 1 | 879,150 |  |  | 16.76 |
Vested | (841,728) |  |  | 10.84 |
Forfeited | (22,343) |  |  | 22.33 |
Nonvested at end of period | 1,562,202 |  | $ | 22.31 |
| 1 |  | During 2013, CMS Energy granted 326,518 TSR shares, 271,250 time-lapse shares, 45,486 shares from dividends paid on TSR shares, and 277,333 shares granted as a result of the outcome of the TSR awards’ market condition. During 2013, Consumers granted 310,454 TSR shares, 264,283 time-lapse shares, 43,450 shares from dividends paid on TSR shares, and 260,963 shares granted as a result of the outcome of the TSR awards’ market condition.
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions |
| 2013 |  | 2012 |  | 2011 |  |
Expected volatility |  | 17.4 | % |  | 20.3 | % |  | 29.6 | % |
Expected dividend yield |  | 3.9 |  |  | 4.1 |  |  | 4.6 |  |
Risk-free rate |  | 0.4 |  |  | 0.3 |  |  | 1.0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |
Years Ended December 31 | 2013 | 2012 | 2011 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 16.65 |  | $ | 12.32 |  | $ | 13.89 |
Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 16.76 |  | $ | 12.28 |  | $ | 14.17 |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan |
In Millions
Years Ended December 31 | 2013 | 2012 | 2011 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 10 |  | $ | 10 |  | $ | 7 |
Compensation expense recognized |  |  | 14 |  |  | 12 |  |  | 10 |
Income tax benefit recognized |  |  | 5 |  |  | 5 |  |  | 4 |
Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 9 |  | $ | 8 |  | $ | 7 |
Compensation expense recognized |  |  | 14 |  |  | 11 |  |  | 10 |
Income tax benefit recognized |  |  | 5 |  |  | 4 |  |  | 4 |
Consumers Energy Company [Member] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity |
Year Ended December 31, 2013 | Number of Shares | Weighted-Average Grant Date Fair Value per Share |
CMS Energy, including Consumers |  |  |  |  |
Nonvested at beginning of period | 1,654,776 |  | $ | 19.15 |
Granted 1 | 920,587 |  |  | 16.65 |
Vested | (927,164) |  |  | 10.85 |
Forfeited | (22,343) |  |  | 22.33 |
Nonvested at end of period | 1,625,856 |  | $ | 22.42 |
Consumers |  |  |  |  |
Nonvested at beginning of period | 1,547,123 |  | $ | 19.22 |
Granted 1 | 879,150 |  |  | 16.76 |
Vested | (841,728) |  |  | 10.84 |
Forfeited | (22,343) |  |  | 22.33 |
Nonvested at end of period | 1,562,202 |  | $ | 22.31 |
| 1 |  | During 2013, CMS Energy granted 326,518 TSR shares, 271,250 time-lapse shares, 45,486 shares from dividends paid on TSR shares, and 277,333 shares granted as a result of the outcome of the TSR awards’ market condition. During 2013, Consumers granted 310,454 TSR shares, 264,283 time-lapse shares, 43,450 shares from dividends paid on TSR shares, and 260,963 shares granted as a result of the outcome of the TSR awards’ market condition.
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions |
| 2013 |  | 2012 |  | 2011 |  |
Expected volatility |  | 17.4 | % |  | 20.3 | % |  | 29.6 | % |
Expected dividend yield |  | 3.9 |  |  | 4.1 |  |  | 4.6 |  |
Risk-free rate |  | 0.4 |  |  | 0.3 |  |  | 1.0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |
Years Ended December 31 | 2013 | 2012 | 2011 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 16.65 |  | $ | 12.32 |  | $ | 13.89 |
Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 16.76 |  | $ | 12.28 |  | $ | 14.17 |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan |
In Millions
Years Ended December 31 | 2013 | 2012 | 2011 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 10 |  | $ | 10 |  | $ | 7 |
Compensation expense recognized |  |  | 14 |  |  | 12 |  |  | 10 |
Income tax benefit recognized |  |  | 5 |  |  | 5 |  |  | 4 |
Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 9 |  | $ | 8 |  | $ | 7 |
Compensation expense recognized |  |  | 14 |  |  | 11 |  |  | 10 |
Income tax benefit recognized |  |  | 5 |  |  | 4 |  |  | 4 |

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