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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Schedule Of Restricted Stock Activity |
| CMS Energy, including Consumers |  | Consumers |
Year Ended December 31, 2015 | 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 | 1,679,595 |  |  | $ | 24.69 |  | 1,614,684 |  |  | $ | 24.71 |
Granted |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock | 789,602 |  |  |  | 36.84 |  | 750,262 |  |  |  | 36.83 |
Restricted stock units | 13,180 |  |  |  | 34.25 |  | 12,837 |  |  |  | 34.25 |
Vested - restricted stock | (793,103) |  |  |  | 27.76 |  | (756,286) |  |  |  | 27.74 |
Forfeited - restricted stock | (64,340) |  |  |  | 26.93 |  | (63,840) |  |  |  | 26.93 |
Nonvested at end of period | 1,624,934 |  |  | $ | 29.08 |  | 1,557,657 |  |  | $ | 29.06 |
Year Ended December 31, 2015 |  | CMS Energy, including Consumers |  | Consumers |
Granted |  |  |  |  |
Time-lapse awards |  | 152,820 |  | 146,536 |
Market-based awards |  | 158,385 |  | 149,909 |
Performance-based awards |  | 158,385 |  | 149,909 |
Restricted stock units |  | 12,848 |  | 12,514 |
Dividends on market-based awards |  | 22,208 |  | 21,129 |
Dividends on performance-based awards |  | 11,046 |  | 10,502 |
Dividends on restricted stock units |  | 332 |  | 323 |
Additional market-based shares based on achievement of condition |  | 286,758 |  | 272,277 |
Total granted |  | 802,782 |  | 763,099 |
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions |
Years Ended December 31 | 2015 |  | 2014 |  | 2013 |  |
Expected volatility |  | 14.1 | % |  | 15.6 | % |  | 17.4 | % |
Expected dividend yield |  | 3.3 |  |  | 3.7 |  |  | 3.9 |  |
Risk-free rate |  | 0.8 |  |  | 0.8 |  |  | 0.4 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |
Years Ended December 31 | 2015 | 2014 | 2013 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 36.84 |  | $ | 26.15 |  | $ | 16.65 |
Restricted stock units granted |  |  | 34.25 |  |  | - |  |  | - |
Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 36.83 |  | $ | 26.18 |  | $ | 16.76 |
Restricted stock units granted |  |  | 34.25 |  |  | - |  |  | - |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan |
In Millions
Years Ended December 31 | 2015 | 2014 | 2013 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 29 |  | $ | 16 |  | $ | 10 |
Compensation expense recognized |  |  | 20 |  |  | 14 |  |  | 14 |
Income tax benefit recognized |  |  | 8 |  |  | 5 |  |  | 5 |
Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 28 |  | $ | 15 |  | $ | 9 |
Compensation expense recognized |  |  | 19 |  |  | 13 |  |  | 14 |
Income tax benefit recognized |  |  | 7 |  |  | 5 |  |  | 5 |
Consumers Energy Company [Member] |
Schedule Of Restricted Stock Activity |
| CMS Energy, including Consumers |  | Consumers |
Year Ended December 31, 2015 | 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 | 1,679,595 |  |  | $ | 24.69 |  | 1,614,684 |  |  | $ | 24.71 |
Granted |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock | 789,602 |  |  |  | 36.84 |  | 750,262 |  |  |  | 36.83 |
Restricted stock units | 13,180 |  |  |  | 34.25 |  | 12,837 |  |  |  | 34.25 |
Vested - restricted stock | (793,103) |  |  |  | 27.76 |  | (756,286) |  |  |  | 27.74 |
Forfeited - restricted stock | (64,340) |  |  |  | 26.93 |  | (63,840) |  |  |  | 26.93 |
Nonvested at end of period | 1,624,934 |  |  | $ | 29.08 |  | 1,557,657 |  |  | $ | 29.06 |
Year Ended December 31, 2015 |  | CMS Energy, including Consumers |  | Consumers |
Granted |  |  |  |  |
Time-lapse awards |  | 152,820 |  | 146,536 |
Market-based awards |  | 158,385 |  | 149,909 |
Performance-based awards |  | 158,385 |  | 149,909 |
Restricted stock units |  | 12,848 |  | 12,514 |
Dividends on market-based awards |  | 22,208 |  | 21,129 |
Dividends on performance-based awards |  | 11,046 |  | 10,502 |
Dividends on restricted stock units |  | 332 |  | 323 |
Additional market-based shares based on achievement of condition |  | 286,758 |  | 272,277 |
Total granted |  | 802,782 |  | 763,099 |
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions |
Years Ended December 31 | 2015 |  | 2014 |  | 2013 |  |
Expected volatility |  | 14.1 | % |  | 15.6 | % |  | 17.4 | % |
Expected dividend yield |  | 3.3 |  |  | 3.7 |  |  | 3.9 |  |
Risk-free rate |  | 0.8 |  |  | 0.8 |  |  | 0.4 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |
Years Ended December 31 | 2015 | 2014 | 2013 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 36.84 |  | $ | 26.15 |  | $ | 16.65 |
Restricted stock units granted |  |  | 34.25 |  |  | - |  |  | - |
Consumers |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  | $ | 36.83 |  | $ | 26.18 |  | $ | 16.76 |
Restricted stock units granted |  |  | 34.25 |  |  | - |  |  | - |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan |
In Millions
Years Ended December 31 | 2015 | 2014 | 2013 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 29 |  | $ | 16 |  | $ | 10 |
Compensation expense recognized |  |  | 20 |  |  | 14 |  |  | 14 |
Income tax benefit recognized |  |  | 8 |  |  | 5 |  |  | 5 |
Consumers |  |  |  |  |  |  |  |  |  |
Fair value of shares that vested during the year |  | $ | 28 |  | $ | 15 |  | $ | 9 |
Compensation expense recognized |  |  | 19 |  |  | 13 |  |  | 14 |
Income tax benefit recognized |  |  | 7 |  |  | 5 |  |  | 5 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of restricted stock, including, but not limited to: (a) expected volatility of the entity's shares, (b) expected dividends, and (c) risk-free rate(s). + References No definition available. + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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