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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2015
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
In Millions
| December 31, 2015 |  | December 31, 2014 |
|  | Fair Value |  |  | Fair Value |
| Carrying |  |  |  | Level |  | Carrying |  |  |  | Level |
| Amount | Total | 1 | 2 | 3 |  | Amount | Total | 1 | 2 | 3 |
CMS Energy, including Consumers |
Securities held to maturity |  | $ | 11 |  | $ | 11 |  | $ | - |  | $ | 11 |  | $ | - |  |  | $ | 11 |  | $ | 11 |  | $ | - |  | $ | 11 |  | $ | - |
Notes payable 1 |  |  | 14 |  |  | 14 |  |  | - |  |  | - |  |  | 14 |  |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |
Notes receivable 2 |  |  | 1,161 |  |  | 1,228 |  |  | - |  |  | - |  |  | 1,228 |  |  |  | 938 |  |  | 995 |  |  | - |  |  | - |  |  | 995 |
Long-term debt 3 |  |  | 9,125 |  |  | 9,599 |  |  | - |  |  | 8,648 |  |  | 951 |  |  |  | 8,535 |  |  | 9,285 |  |  | - |  |  | 8,252 |  |  | 1,033 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 4 |  | $ | 5,404 |  | $ | 5,684 |  | $ | - |  | $ | 4,733 |  | $ | 951 |  |  | $ | 5,278 |  | $ | 5,749 |  | $ | - |  | $ | 4,716 |  | $ | 1,033 |
| 1 |  | Includes current portion of notes payable of $1 million at December 31, 2015.
| 2 |  | Includes current portion of notes receivable of $144 million at December 31, 2015 and $138 million at December 31, 2014.
| 3 |  | Includes current portion of long-term debt of $684 million at December 31, 2015 and $519 million at December 31, 2014.
| 4 |  | Includes current portion of long-term debt of $198 million at December 31, 2015 and $124 million at December 31, 2014.
Schedule Of Investment Securities |
In Millions
| December 31, 2015 |  | December 31, 2014 |
|  | Unrealized | Unrealized | Fair |  |  | Unrealized | Unrealized | Fair |
| Cost | Gains | Losses | Value |  | Cost | Gains | Losses | Value |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 152 |  | $ | - |  | $ | 6 |  | $ | 146 |  |  | $ | 129 |  | $ | - |  | $ | 2 |  | $ | 127 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 11 |  |  | - |  |  | - |  |  | 11 |  |  |  | 11 |  |  | - |  |  | - |  |  | 11 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 108 |  | $ | - |  | $ | 4 |  | $ | 104 |  |  | $ | 92 |  | $ | - |  | $ | 2 |  | $ | 90 |
CMS Energy common stock |  |  | 4 |  |  | 25 |  |  | - |  |  | 29 |  |  |  | 5 |  |  | 33 |  |  | - |  |  | 38 |
Schedule Of Proceeds And Gross Realized Gains/Losses From Sales Of Available-For-Sale Securities |
In Millions
Years Ended December 31 | 2015 | 2014 | 2013 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 3 |  | $ | 8 |  | $ | 3 |
Consumers |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 2 |  | $ | 6 |  | $ | 2 |
Consumers Energy Company [Member] |
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
In Millions
| December 31, 2015 |  | December 31, 2014 |
|  | Fair Value |  |  | Fair Value |
| Carrying |  |  |  | Level |  | Carrying |  |  |  | Level |
| Amount | Total | 1 | 2 | 3 |  | Amount | Total | 1 | 2 | 3 |
CMS Energy, including Consumers |
Securities held to maturity |  | $ | 11 |  | $ | 11 |  | $ | - |  | $ | 11 |  | $ | - |  |  | $ | 11 |  | $ | 11 |  | $ | - |  | $ | 11 |  | $ | - |
Notes payable 1 |  |  | 14 |  |  | 14 |  |  | - |  |  | - |  |  | 14 |  |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |
Notes receivable 2 |  |  | 1,161 |  |  | 1,228 |  |  | - |  |  | - |  |  | 1,228 |  |  |  | 938 |  |  | 995 |  |  | - |  |  | - |  |  | 995 |
Long-term debt 3 |  |  | 9,125 |  |  | 9,599 |  |  | - |  |  | 8,648 |  |  | 951 |  |  |  | 8,535 |  |  | 9,285 |  |  | - |  |  | 8,252 |  |  | 1,033 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 4 |  | $ | 5,404 |  | $ | 5,684 |  | $ | - |  | $ | 4,733 |  | $ | 951 |  |  | $ | 5,278 |  | $ | 5,749 |  | $ | - |  | $ | 4,716 |  | $ | 1,033 |
| 1 |  | Includes current portion of notes payable of $1 million at December 31, 2015.
| 2 |  | Includes current portion of notes receivable of $144 million at December 31, 2015 and $138 million at December 31, 2014.
| 3 |  | Includes current portion of long-term debt of $684 million at December 31, 2015 and $519 million at December 31, 2014.
| 4 |  | Includes current portion of long-term debt of $198 million at December 31, 2015 and $124 million at December 31, 2014.
Schedule Of Investment Securities |
In Millions
| December 31, 2015 |  | December 31, 2014 |
|  | Unrealized | Unrealized | Fair |  |  | Unrealized | Unrealized | Fair |
| Cost | Gains | Losses | Value |  | Cost | Gains | Losses | Value |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 152 |  | $ | - |  | $ | 6 |  | $ | 146 |  |  | $ | 129 |  | $ | - |  | $ | 2 |  | $ | 127 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 11 |  |  | - |  |  | - |  |  | 11 |  |  |  | 11 |  |  | - |  |  | - |  |  | 11 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 108 |  | $ | - |  | $ | 4 |  | $ | 104 |  |  | $ | 92 |  | $ | - |  | $ | 2 |  | $ | 90 |
CMS Energy common stock |  |  | 4 |  |  | 25 |  |  | - |  |  | 29 |  |  |  | 5 |  |  | 33 |  |  | - |  |  | 38 |
Schedule Of Proceeds And Gross Realized Gains/Losses From Sales Of Available-For-Sale Securities |
In Millions
Years Ended December 31 | 2015 | 2014 | 2013 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 3 |  | $ | 8 |  | $ | 3 |
Consumers |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 2 |  | $ | 6 |  | $ | 2 |

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