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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Schedule Of Restricted Stock Activity |
| CMS Energy, including Consumers |  | Consumers |
Year Ended December 31, 2014 | 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 | 1,625,856 |  |  | $ | 22.42 |  | 1,562,202 |  |  | $ | 22.31 |
Granted | 863,742 |  |  |  | 26.15 |  | 831,069 |  |  |  | 26.18 |
Vested | (756,310) |  |  |  | 21.51 |  | (727,737) |  |  |  | 21.26 |
Forfeited | (53,693) |  |  |  | 24.41 |  | (50,850) |  |  |  | 24.45 |
Nonvested at end of period | 1,679,595 |  |  | $ | 24.69 |  | 1,614,684 |  |  | $ | 24.71 |
Year Ended December 31, 2014 |  | CMS Energy, including Consumers |  | Consumers |
Shares Granted |  |  |  |  |
Time-lapse awards |  | 289,510 |  | 282,990 |
Market-based awards |  | 169,409 |  | 162,264 |
Performance-based awards |  | 169,409 |  | 162,264 |
Dividends on market-based awards |  | 29,579 |  | 28,199 |
Dividends on performance-based awards |  | 6,146 |  | 5,888 |
Additional market-based shares based on achievement of condition |  | 199,689 |  | 189,464 |
Total shares granted |  | 863,742 |  | 831,069 |
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions |
Years Ended December 31 | 2014 |  | 2013 |  | 2012 |  |
Expected volatility |  | 15.6 | % |  | 17.4 | % |  | 20.3 | % |
Expected dividend yield |  | 3.7 |  |  | 3.9 |  |  | 4.1 |  |
Risk-free rate |  | 0.8 |  |  | 0.4 |  |  | 0.3 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |
Years Ended December 31 | 2014 | 2013 | 2012 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 26.15 |  | $ | 16.65 |  | $ | 12.32 |
Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 26.18 |  | $ | 16.76 |  | $ | 12.28 |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan |
In Millions
Years Ended December 31 | 2014 | 2013 | 2012 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 16 |  | $ | 10 |  | $ | 10 |
Compensation expense recognized |  |  | 14 |  |  | 14 |  |  | 12 |
Income tax benefit recognized |  |  | 5 |  |  | 5 |  |  | 5 |
Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 15 |  | $ | 9 |  | $ | 8 |
Compensation expense recognized |  |  | 13 |  |  | 14 |  |  | 11 |
Income tax benefit recognized |  |  | 5 |  |  | 5 |  |  | 4 |
Consumers Energy Company [Member] |
Schedule Of Restricted Stock Activity |
| CMS Energy, including Consumers |  | Consumers |
Year Ended December 31, 2014 | 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 | 1,625,856 |  |  | $ | 22.42 |  | 1,562,202 |  |  | $ | 22.31 |
Granted | 863,742 |  |  |  | 26.15 |  | 831,069 |  |  |  | 26.18 |
Vested | (756,310) |  |  |  | 21.51 |  | (727,737) |  |  |  | 21.26 |
Forfeited | (53,693) |  |  |  | 24.41 |  | (50,850) |  |  |  | 24.45 |
Nonvested at end of period | 1,679,595 |  |  | $ | 24.69 |  | 1,614,684 |  |  | $ | 24.71 |
Year Ended December 31, 2014 |  | CMS Energy, including Consumers |  | Consumers |
Shares Granted |  |  |  |  |
Time-lapse awards |  | 289,510 |  | 282,990 |
Market-based awards |  | 169,409 |  | 162,264 |
Performance-based awards |  | 169,409 |  | 162,264 |
Dividends on market-based awards |  | 29,579 |  | 28,199 |
Dividends on performance-based awards |  | 6,146 |  | 5,888 |
Additional market-based shares based on achievement of condition |  | 199,689 |  | 189,464 |
Total shares granted |  | 863,742 |  | 831,069 |
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions |
Years Ended December 31 | 2014 |  | 2013 |  | 2012 |  |
Expected volatility |  | 15.6 | % |  | 17.4 | % |  | 20.3 | % |
Expected dividend yield |  | 3.7 |  |  | 3.9 |  |  | 4.1 |  |
Risk-free rate |  | 0.8 |  |  | 0.4 |  |  | 0.3 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |
Years Ended December 31 | 2014 | 2013 | 2012 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 26.15 |  | $ | 16.65 |  | $ | 12.32 |
Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 26.18 |  | $ | 16.76 |  | $ | 12.28 |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan |
In Millions
Years Ended December 31 | 2014 | 2013 | 2012 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 16 |  | $ | 10 |  | $ | 10 |
Compensation expense recognized |  |  | 14 |  |  | 14 |  |  | 12 |
Income tax benefit recognized |  |  | 5 |  |  | 5 |  |  | 5 |
Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 15 |  | $ | 9 |  | $ | 8 |
Compensation expense recognized |  |  | 13 |  |  | 14 |  |  | 11 |
Income tax benefit recognized |  |  | 5 |  |  | 5 |  |  | 4 |

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