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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Share-based Compensation, Restricted Stock Units Award Activity |
Year Ended December 31, 2012 | Number of Shares | Weighted-Average Grant Date Fair Value per Share |
CMS Energy, including Consumers |  |  |  |  |
Nonvested at beginning of period | 1,848,068 |  | $ | 16.29 |
Granted1 | 929,127 |  |  | 12.32 |
Vested | (1,104,225) |  |  | 8.61 |
Forfeited | (18,194) |  |  | 19.79 |
Nonvested at end of period | 1,654,776 |  | $ | 19.15 |
Consumers |  |  |  |  |
Nonvested at beginning of period | 1,689,997 |  | $ | 16.36 |
Granted1 | 889,070 |  |  | 12.28 |
Vested | (1,014,450) |  |  | 8.36 |
Forfeited | (17,494) |  |  | 19.94 |
Nonvested at end of period | 1,547,123 |  | $ | 19.22 |
1 | During 2012, CMS Energy granted 306,917 TSR shares, 176,809 time-lapse shares, 38,401 shares from dividends paid on TSR shares, and 407,000 shares granted as a result of the outcome of the TSR awards’ market condition. During 2012, Consumers granted 291,722 TSR shares, 169,754 time-lapse shares, 37,109 shares from dividends paid on TSR shares, and 390,485 shares granted as a result of the outcome of the TSR awards’ market condition.
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions |
| 2012 |  | 2011 |  | 2010 |  |
Expected volatility |  | 20.3 | % |  | 29.6 | % |  | 30.1 | % |
Expected dividend yield |  | 4.1 |  |  | 4.6 |  |  | 2.4 |  |
Risk-free rate |  | 0.3 |  |  | 1.0 |  |  | 0.9 |  |
Schedule of Share-based Compensation, Stock Options, Activity |
Year Ended December 31, 2012 | Options Outstanding, Fully Vested, and Exercisable | Weighted-Average Exercise Price per Share |
CMS Energy, including Consumers |  |  |  |  |
Outstanding at beginning of period | 65,580 |  | $ | 22.20 |
Cancelled or expired | (65,580) |  |  | 22.20 |
Outstanding at end of period | - |  | $ | - |
Consumers |  |  |  |  |
Outstanding at beginning of period | 61,500 |  | $ | 22.20 |
Cancelled or expired | (61,500) |  |  | 22.20 |
Outstanding at end of period | - |  | $ | - |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |
Years Ended December 31 | 2012 | 2011 | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 12.32 |  | $ | 13.89 |  | $ | 16.22 |
Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 12.28 |  | $ | 14.17 |  | $ | 16.27 |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan |
In Millions
Years Ended December 31 | 2012 | 2011 | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 10 |  | $ | 7 |  | $ | 7 |
Compensation expense recognized |  |  | 12 |  |  | 10 |  |  | 9 |
Income tax benefit recognized |  |  | 5 |  |  | 4 |  |  | 4 |
Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 8 |  | $ | 7 |  | $ | 6 |
Compensation expense recognized |  |  | 11 |  |  | 10 |  |  | 9 |
Income tax benefit recognized |  |  | 4 |  |  | 4 |  |  | 3 |
Consumers Energy Company [Member] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity |
Year Ended December 31, 2012 | Number of Shares | Weighted-Average Grant Date Fair Value per Share |
CMS Energy, including Consumers |  |  |  |  |
Nonvested at beginning of period | 1,848,068 |  | $ | 16.29 |
Granted1 | 929,127 |  |  | 12.32 |
Vested | (1,104,225) |  |  | 8.61 |
Forfeited | (18,194) |  |  | 19.79 |
Nonvested at end of period | 1,654,776 |  | $ | 19.15 |
Consumers |  |  |  |  |
Nonvested at beginning of period | 1,689,997 |  | $ | 16.36 |
Granted1 | 889,070 |  |  | 12.28 |
Vested | (1,014,450) |  |  | 8.36 |
Forfeited | (17,494) |  |  | 19.94 |
Nonvested at end of period | 1,547,123 |  | $ | 19.22 |
1 | During 2012, CMS Energy granted 306,917 TSR shares, 176,809 time-lapse shares, 38,401 shares from dividends paid on TSR shares, and 407,000 shares granted as a result of the outcome of the TSR awards’ market condition. During 2012, Consumers granted 291,722 TSR shares, 169,754 time-lapse shares, 37,109 shares from dividends paid on TSR shares, and 390,485 shares granted as a result of the outcome of the TSR awards’ market condition.
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions |
| 2012 |  | 2011 |  | 2010 |  |
Expected volatility |  | 20.3 | % |  | 29.6 | % |  | 30.1 | % |
Expected dividend yield |  | 4.1 |  |  | 4.6 |  |  | 2.4 |  |
Risk-free rate |  | 0.3 |  |  | 1.0 |  |  | 0.9 |  |
Schedule of Share-based Compensation, Stock Options, Activity |
Year Ended December 31, 2012 | Options Outstanding, Fully Vested, and Exercisable | Weighted-Average Exercise Price per Share |
CMS Energy, including Consumers |  |  |  |  |
Outstanding at beginning of period | 65,580 |  | $ | 22.20 |
Cancelled or expired | (65,580) |  |  | 22.20 |
Outstanding at end of period | - |  | $ | - |
Consumers |  |  |  |  |
Outstanding at beginning of period | 61,500 |  | $ | 22.20 |
Cancelled or expired | (61,500) |  |  | 22.20 |
Outstanding at end of period | - |  | $ | - |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |
Years Ended December 31 | 2012 | 2011 | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 12.32 |  | $ | 13.89 |  | $ | 16.22 |
Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 12.28 |  | $ | 14.17 |  | $ | 16.27 |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan |
In Millions
Years Ended December 31 | 2012 | 2011 | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 10 |  | $ | 7 |  | $ | 7 |
Compensation expense recognized |  |  | 12 |  |  | 10 |  |  | 9 |
Income tax benefit recognized |  |  | 5 |  |  | 4 |  |  | 4 |
Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 8 |  | $ | 7 |  | $ | 6 |
Compensation expense recognized |  |  | 11 |  |  | 10 |  |  | 9 |
Income tax benefit recognized |  |  | 4 |  |  | 4 |  |  | 3 |

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