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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2011
Schedule of Share-based Compensation, Restricted Stock Units Award Activity |
Year Ended December 31, 2011 |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value per Share |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |
Nonvested at beginning of period |  |  | 1,993,465 |  |  | $ | 13.26 |
Granted 1 |  |  | 787,149 |  |  |  | 13.89 |
Vested |  |  | (917,190 | ) |  |  | 7.64 |
Forfeited |  |  | (15,356 | ) |  |  | 16.94 |
Nonvested at end of period |  |  | 1,848,068 |  |  | $ | 16.29 |
CONSUMERS |  |  |  |  |  |  |  |
Nonvested at beginning of period |  |  | 1,805,023 |  |  | $ | 13.28 |
Granted 1 |  |  | 737,504 |  |  |  | 14.17 |
Vested |  |  | (837,174 | ) |  |  | 7.77 |
Forfeited |  |  | (15,356 | ) |  |  | 16.94 |
Nonvested at end of period |  |  | 1,689,997 |  |  | $ | 16.36 |
1 | During 2011, CMS Energy granted 310,100 TSR shares, 215,400 time-lapse shares, 25,329 shares from dividends paid on TSR shares, and 236,320 shares granted as a result of the outcome of the TSR awards' market condition. During 2011, Consumers granted 295,035 TSR shares, 207,613 time-lapse shares, 23,328 shares from dividends paid on TSR shares, and 211,528 shares granted as a result of the outcome of the TSR awards' market condition.
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Expected volatility |  |  | 29.6 | % |  |  | 30.1 | % |  |  | 29.8 | %
Expected dividend yield |  |  | 4.6 | % |  |  | 2.4 | % |  |  | 2.0 | %
Risk-free rate |  |  | 1.0 | % |  |  | 0.9 | % |  |  | 1.8 | %
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan |
In Millions |
Years Ended December 31 |  | 2011 |  |  | 2010 |  |  | 2009 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 7 |  |  | $ | 7 |  |  | $ | 4 |
Compensation expense recognized |  |  | 10 |  |  |  | 9 |  |  |  | 9 |
Income tax benefit recognized |  |  | 4 |  |  |  | 4 |  |  |  | 3 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 7 |  |  | $ | 6 |  |  | $ | 4 |
Compensation expense recognized |  |  | 10 |  |  |  | 9 |  |  |  | 8 |
Income tax benefit recognized |  |  | 4 |  |  |  | 3 |  |  |  | 3 |
Schedule of Share-based Compensation, Stock Options, Activity |
Year Ended December 31, 2011 |  | Options Outstanding, Fully Vested, and Exercisable |  |  | Weighted- Average Exercise Price per Share |  |  | Weighted- Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
|  | (In Millions) |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period |  |  | 437,080 |  |  | $ | 22.34 |  |  |  | 1.1 years |  |  | $ | (2 | )
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (127,500 | ) |  |  | 11.87 |  |  |  |  |  |  |  |  |
Cancelled or expired |  |  | (244,000 | ) |  |  | 27.85 |  |  |  |  |  |  |  |  |
Outstanding at end of period |  |  | 65,580 |  |  | $ | 22.20 |  |  |  | 0.2 years |  |  | $ | — |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period |  |  | 267,468 |  |  | $ | 20.64 |  |  |  | 1.2 years |  |  | $ | (1 | )
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (92,968 | ) |  |  | 10.25 |  |  |  |  |  |  |  |  |
Cancelled or expired |  |  | (113,000 | ) |  |  | 28.34 |  |  |  |  |  |  |  |  |
Outstanding at end of period |  |  | 61,500 |  |  | $ | 22.20 |  |  |  | 0.2 years |  |  | $ | — |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |
Years Ended December 31 |  | 2011 |  |  | 2010 |  |  | 2009 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 13.89 |  |  | $ | 16.22 |  |  | $ | 13.49 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 14.17 |  |  | $ | 16.27 |  |  | $ | 13.44 |
Consumers Energy Company [Member] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity |
Year Ended December 31, 2011 |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value per Share |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |
Nonvested at beginning of period |  |  | 1,993,465 |  |  | $ | 13.26 |
Granted 1 |  |  | 787,149 |  |  |  | 13.89 |
Vested |  |  | (917,190 | ) |  |  | 7.64 |
Forfeited |  |  | (15,356 | ) |  |  | 16.94 |
Nonvested at end of period |  |  | 1,848,068 |  |  | $ | 16.29 |
CONSUMERS |  |  |  |  |  |  |  |
Nonvested at beginning of period |  |  | 1,805,023 |  |  | $ | 13.28 |
Granted 1 |  |  | 737,504 |  |  |  | 14.17 |
Vested |  |  | (837,174 | ) |  |  | 7.77 |
Forfeited |  |  | (15,356 | ) |  |  | 16.94 |
Nonvested at end of period |  |  | 1,689,997 |  |  | $ | 16.36 |
1 | During 2011, CMS Energy granted 310,100 TSR shares, 215,400 time-lapse shares, 25,329 shares from dividends paid on TSR shares, and 236,320 shares granted as a result of the outcome of the TSR awards' market condition. During 2011, Consumers granted 295,035 TSR shares, 207,613 time-lapse shares, 23,328 shares from dividends paid on TSR shares, and 211,528 shares granted as a result of the outcome of the TSR awards' market condition.
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Expected volatility |  |  | 29.6 | % |  |  | 30.1 | % |  |  | 29.8 | %
Expected dividend yield |  |  | 4.6 | % |  |  | 2.4 | % |  |  | 2.0 | %
Risk-free rate |  |  | 1.0 | % |  |  | 0.9 | % |  |  | 1.8 | %
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan |
In Millions |
Years Ended December 31 |  | 2011 |  |  | 2010 |  |  | 2009 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 7 |  |  | $ | 7 |  |  | $ | 4 |
Compensation expense recognized |  |  | 10 |  |  |  | 9 |  |  |  | 9 |
Income tax benefit recognized |  |  | 4 |  |  |  | 4 |  |  |  | 3 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 7 |  |  | $ | 6 |  |  | $ | 4 |
Compensation expense recognized |  |  | 10 |  |  |  | 9 |  |  |  | 8 |
Income tax benefit recognized |  |  | 4 |  |  |  | 3 |  |  |  | 3 |
Schedule of Share-based Compensation, Stock Options, Activity |
Year Ended December 31, 2011 |  | Options Outstanding, Fully Vested, and Exercisable |  |  | Weighted- Average Exercise Price per Share |  |  | Weighted- Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
|  | (In Millions) |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period |  |  | 437,080 |  |  | $ | 22.34 |  |  |  | 1.1 years |  |  | $ | (2 | )
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (127,500 | ) |  |  | 11.87 |  |  |  |  |  |  |  |  |
Cancelled or expired |  |  | (244,000 | ) |  |  | 27.85 |  |  |  |  |  |  |  |  |
Outstanding at end of period |  |  | 65,580 |  |  | $ | 22.20 |  |  |  | 0.2 years |  |  | $ | — |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period |  |  | 267,468 |  |  | $ | 20.64 |  |  |  | 1.2 years |  |  | $ | (1 | )
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (92,968 | ) |  |  | 10.25 |  |  |  |  |  |  |  |  |
Cancelled or expired |  |  | (113,000 | ) |  |  | 28.34 |  |  |  |  |  |  |  |  |
Outstanding at end of period |  |  | 61,500 |  |  | $ | 22.20 |  |  |  | 0.2 years |  |  | $ | — |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |
Years Ended December 31 |  | 2011 |  |  | 2010 |  |  | 2009 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 13.89 |  |  | $ | 16.22 |  |  | $ | 13.49 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 14.17 |  |  | $ | 16.27 |  |  | $ | 13.44 |

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