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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2014
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
In Millions
| June 30, 2014 |  | December 31, 2013 |
|  | 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 |  | $ | 12 |  | $ | 12 |  | $ | - |  | $ | 12 |  | $ | - |  |  | $ | 10 |  | $ | 10 |  | $ | - |  | $ | 10 |  | $ | - |
Notes receivable 1 |  |  | 770 |  |  | 813 |  |  | - |  |  | - |  |  | 813 |  |  |  | 683 |  |  | 724 |  |  | - |  |  | - |  |  | 724 |
Long-term debt 2 |  |  | 7,953 |  |  | 8,702 |  |  | - |  |  | 7,691 |  |  | 1,011 |  |  |  | 7,642 |  |  | 8,368 |  |  | - |  |  | 7,406 |  |  | 962 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 3 |  | $ | 4,600 |  | $ | 5,047 |  | $ | - |  | $ | 4,036 |  | $ | 1,011 |  |  | $ | 4,622 |  | $ | 4,940 |  | $ | - |  | $ | 3,978 |  | $ | 962 |
| 1 |  | Includes current portion of notes receivable of $87 million at June 30, 2014 and $48 million at December 31, 2013.
| 2 |  | Includes current portion of long-term debt of $418 million at June 30, 2014 and $541 million at December 31, 2013.
| 3 |  | Includes current portion of long-term debt of $45 million at June 30, 2014 and $43 million at December 31, 2013.
Schedule Of Investment Securities |
In Millions
| June 30, 2014 |  | December 31, 2013 |
|  | 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 |  | $ | 133 |  | $ | 1 |  | $ | - |  | $ | 134 |  |  | $ | 136 |  | $ | - |  | $ | - |  | $ | 136 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 12 |  |  | - |  |  | - |  |  | 12 |  |  |  | 10 |  |  | - |  |  | - |  |  | 10 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 94 |  | $ | 1 |  | $ | - |  | $ | 95 |  |  | $ | 95 |  | $ | - |  | $ | - |  | $ | 95 |
CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
common stock |  |  | 5 |  |  | 29 |  |  | - |  |  | 34 |  |  |  | 5 |  |  | 24 |  |  | - |  |  | 29 |
Consumers Energy Company [Member] |
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
In Millions
| June 30, 2014 |  | December 31, 2013 |
|  | 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 |  | $ | 12 |  | $ | 12 |  | $ | - |  | $ | 12 |  | $ | - |  |  | $ | 10 |  | $ | 10 |  | $ | - |  | $ | 10 |  | $ | - |
Notes receivable 1 |  |  | 770 |  |  | 813 |  |  | - |  |  | - |  |  | 813 |  |  |  | 683 |  |  | 724 |  |  | - |  |  | - |  |  | 724 |
Long-term debt 2 |  |  | 7,953 |  |  | 8,702 |  |  | - |  |  | 7,691 |  |  | 1,011 |  |  |  | 7,642 |  |  | 8,368 |  |  | - |  |  | 7,406 |  |  | 962 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 3 |  | $ | 4,600 |  | $ | 5,047 |  | $ | - |  | $ | 4,036 |  | $ | 1,011 |  |  | $ | 4,622 |  | $ | 4,940 |  | $ | - |  | $ | 3,978 |  | $ | 962 |
| 1 |  | Includes current portion of notes receivable of $87 million at June 30, 2014 and $48 million at December 31, 2013.
| 2 |  | Includes current portion of long-term debt of $418 million at June 30, 2014 and $541 million at December 31, 2013.
| 3 |  | Includes current portion of long-term debt of $45 million at June 30, 2014 and $43 million at December 31, 2013.
Schedule Of Investment Securities |
In Millions
| June 30, 2014 |  | December 31, 2013 |
|  | 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 |  | $ | 133 |  | $ | 1 |  | $ | - |  | $ | 134 |  |  | $ | 136 |  | $ | - |  | $ | - |  | $ | 136 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 12 |  |  | - |  |  | - |  |  | 12 |  |  |  | 10 |  |  | - |  |  | - |  |  | 10 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 94 |  | $ | 1 |  | $ | - |  | $ | 95 |  |  | $ | 95 |  | $ | - |  | $ | - |  | $ | 95 |
CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
common stock |  |  | 5 |  |  | 29 |  |  | - |  |  | 34 |  |  |  | 5 |  |  | 24 |  |  | - |  |  | 29 |

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