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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Schedule Of Restricted Stock Activity |
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﻿ | CMS Energy, including Consumers |  | Consumers |
﻿Year Ended December 31, 2016 | 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 | 1,624,934 |  |  | $ | 29.08 |  | 1,557,657 |  |  | $ | 29.06 |
﻿Granted |  |  |  |  |  |  |  |  |  |  |  |
﻿Restricted stock | 826,075 |  |  |  | 31.74 |  | 786,328 |  |  |  | 31.77 |
﻿Restricted stock units | 15,338 |  |  |  | 39.12 |  | 14,907 |  |  |  | 39.12 |
﻿Vested |  |  |  |  |  |  |  |  |  |  |  |
﻿Restricted stock | (819,658) |  |  |  | 24.37 |  | (782,505) |  |  |  | 24.39 |
﻿Restricted stock units | (13,588) |  |  |  | 33.22 |  | (13,233) |  |  |  | 33.23 |
﻿Forfeited - restricted stock | (245,504) |  |  |  | 35.18 |  | (234,523) |  |  |  | 35.17 |
﻿Nonvested at end of period | 1,387,597 |  |  | $ | 32.44 |  | 1,328,631 |  |  | $ | 32.41 |
﻿
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﻿ |  |  |  |  |
﻿Year Ended December 31, 2016 |  | CMS Energy, including Consumers |  | Consumers |
﻿Granted |  |  |  |  |
﻿Time-lapse awards |  | 188,303 |  | 180,958 |
﻿Market-based awards |  | 185,464 |  | 175,818 |
﻿Performance-based awards |  | 185,464 |  | 175,818 |
﻿Restricted stock units |  | 14,595 |  | 14,186 |
﻿Dividends on market-based awards |  | 38,652 |  | 36,646 |
﻿Dividends on performance-based awards |  | 14,438 |  | 13,704 |
﻿Dividends on restricted stock units |  | 743 |  | 721 |
﻿Additional market-based shares based on achievement of condition |  | 213,754 |  | 203,384 |
﻿Total granted |  | 841,413 |  | 801,235 |
﻿
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions |
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﻿Years Ended December 31 | 2016 |  | 2015 |  | 2014 |  |
﻿Expected volatility |  | 16.7 | % |  | 14.1 | % |  | 15.6 | % |
﻿Expected dividend yield |  | 3.2 |  |  | 3.3 |  |  | 3.7 |  |
﻿Risk-free rate |  | 1.0 |  |  | 0.8 |  |  | 0.8 |  |
﻿
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |
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﻿Years Ended December 31 | 2016 | 2015 | 2014 |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
﻿Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
﻿Restricted stock granted |  | $ | 31.74 |  | $ | 36.84 |  | $ | 26.15 |
﻿Restricted stock units granted |  |  | 39.12 |  |  | 34.25 |  |  | - |
﻿Consumers |  |  |  |  |  |  |  |  |  |
﻿Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
﻿Restricted stock granted |  | $ | 31.77 |  | $ | 36.83 |  | $ | 26.18 |
﻿Restricted stock units granted |  |  | 39.12 |  |  | 34.25 |  |  | - |
﻿
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan |
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﻿In Millions
﻿Years Ended December 31 | 2016 | 2015 | 2014 |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
﻿Fair value of shares that vested during the year |  | $ | 31 |  | $ | 29 |  | $ | 16 |
﻿Compensation expense recognized |  |  | 16 |  |  | 20 |  |  | 14 |
﻿Income tax benefit recognized |  |  | 7 |  |  | 8 |  |  | 5 |
﻿Consumers |  |  |  |  |  |  |  |  |  |
﻿Fair value of shares that vested during the year |  | $ | 30 |  | $ | 28 |  | $ | 15 |
﻿Compensation expense recognized |  |  | 16 |  |  | 19 |  |  | 13 |
﻿Income tax benefit recognized |  |  | 6 |  |  | 7 |  |  | 5 |
﻿
Consumers Energy Company [Member] |
Schedule Of Restricted Stock Activity |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ | CMS Energy, including Consumers |  | Consumers |
﻿Year Ended December 31, 2016 | 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 | 1,624,934 |  |  | $ | 29.08 |  | 1,557,657 |  |  | $ | 29.06 |
﻿Granted |  |  |  |  |  |  |  |  |  |  |  |
﻿Restricted stock | 826,075 |  |  |  | 31.74 |  | 786,328 |  |  |  | 31.77 |
﻿Restricted stock units | 15,338 |  |  |  | 39.12 |  | 14,907 |  |  |  | 39.12 |
﻿Vested |  |  |  |  |  |  |  |  |  |  |  |
﻿Restricted stock | (819,658) |  |  |  | 24.37 |  | (782,505) |  |  |  | 24.39 |
﻿Restricted stock units | (13,588) |  |  |  | 33.22 |  | (13,233) |  |  |  | 33.23 |
﻿Forfeited - restricted stock | (245,504) |  |  |  | 35.18 |  | (234,523) |  |  |  | 35.17 |
﻿Nonvested at end of period | 1,387,597 |  |  | $ | 32.44 |  | 1,328,631 |  |  | $ | 32.41 |
﻿
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿Year Ended December 31, 2016 |  | CMS Energy, including Consumers |  | Consumers |
﻿Granted |  |  |  |  |
﻿Time-lapse awards |  | 188,303 |  | 180,958 |
﻿Market-based awards |  | 185,464 |  | 175,818 |
﻿Performance-based awards |  | 185,464 |  | 175,818 |
﻿Restricted stock units |  | 14,595 |  | 14,186 |
﻿Dividends on market-based awards |  | 38,652 |  | 36,646 |
﻿Dividends on performance-based awards |  | 14,438 |  | 13,704 |
﻿Dividends on restricted stock units |  | 743 |  | 721 |
﻿Additional market-based shares based on achievement of condition |  | 213,754 |  | 203,384 |
﻿Total granted |  | 841,413 |  | 801,235 |
﻿
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions |
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |
﻿Years Ended December 31 | 2016 |  | 2015 |  | 2014 |  |
﻿Expected volatility |  | 16.7 | % |  | 14.1 | % |  | 15.6 | % |
﻿Expected dividend yield |  | 3.2 |  |  | 3.3 |  |  | 3.7 |  |
﻿Risk-free rate |  | 1.0 |  |  | 0.8 |  |  | 0.8 |  |
﻿
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |
﻿Years Ended December 31 | 2016 | 2015 | 2014 |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
﻿Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
﻿Restricted stock granted |  | $ | 31.74 |  | $ | 36.84 |  | $ | 26.15 |
﻿Restricted stock units granted |  |  | 39.12 |  |  | 34.25 |  |  | - |
﻿Consumers |  |  |  |  |  |  |  |  |  |
﻿Weighted-average grant-date fair value per share |  |  |  |  |  |  |  |  |  |
﻿Restricted stock granted |  | $ | 31.77 |  | $ | 36.83 |  | $ | 26.18 |
﻿Restricted stock units granted |  |  | 39.12 |  |  | 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 | 2016 | 2015 | 2014 |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
﻿Fair value of shares that vested during the year |  | $ | 31 |  | $ | 29 |  | $ | 16 |
﻿Compensation expense recognized |  |  | 16 |  |  | 20 |  |  | 14 |
﻿Income tax benefit recognized |  |  | 7 |  |  | 8 |  |  | 5 |
﻿Consumers |  |  |  |  |  |  |  |  |  |
﻿Fair value of shares that vested during the year |  | $ | 30 |  | $ | 28 |  | $ | 15 |
﻿Compensation expense recognized |  |  | 16 |  |  | 19 |  |  | 13 |
﻿Income tax benefit recognized |  |  | 6 |  |  | 7 |  |  | 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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