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Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2013
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
In Millions
| September 30, 2013 |  | December 31, 2012 |
|  |  | 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 |  | $ | 10 |  |  | $ | 10 |  | $ | - |  | $ | 10 |  | $ | - |  |  | $ | 9 |  |  | $ | 10 |  | $ | - |  | $ | 10 |  | $ | - |
Notes receivable1 |  |  | 597 |  |  |  | 629 |  |  | - |  |  | - |  |  | 629 |  |  |  | 544 |  |  |  | 581 |  |  | - |  |  | - |  |  | 581 |
Long-term debt2 |  |  | 7,600 |  |  |  | 8,354 |  |  | - |  |  | 7,369 |  |  | 985 |  |  |  | 7,229 |  |  |  | 8,347 |  |  | - |  |  | 7,321 |  |  | 1,026 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt3 |  | $ | 4,633 |  |  | $ | 5,046 |  | $ | - |  | $ | 4,061 |  | $ | 985 |  |  | $ | 4,338 |  |  | $ | 5,015 |  | $ | - |  | $ | 3,989 |  | $ | 1,026 |
1 Includes current portion of notes receivable of $58 million at September 3 0, 2013 and $40 million at December 31, 2012.
2 Includes current portion of long-term debt of $511 million at September 3 0, 2013 and $519 million at December 31, 2012.
3 Includes current portion of long-term debt of $42 million at September 3 0, 2013 and $41 million at December 31, 2012.
Schedule Of Investment Securities |
In Millions
| September 30, 2013 |  | December 31, 2012 |
|  | 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 |  | $ | 137 |  | $ | - |  | $ | - |  | $ | 137 |  |  | $ | 123 |  | $ | 3 |  | $ | - |  | $ | 126 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 10 |  |  | - |  |  | - |  |  | 10 |  |  |  | 9 |  |  | 1 |  |  | - |  |  | 10 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 96 |  | $ | - |  | $ | - |  | $ | 96 |  |  | $ | 83 |  | $ | 2 |  | $ | - |  | $ | 85 |
CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
common stock |  |  | 5 |  |  | 24 |  |  | - |  |  | 29 |  |  |  | 6 |  |  | 26 |  |  | - |  |  | 32 |
Consumers Energy Company [Member] |
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
In Millions
| September 30, 2013 |  | December 31, 2012 |
|  |  | 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 |  | $ | 10 |  |  | $ | 10 |  | $ | - |  | $ | 10 |  | $ | - |  |  | $ | 9 |  |  | $ | 10 |  | $ | - |  | $ | 10 |  | $ | - |
Notes receivable1 |  |  | 597 |  |  |  | 629 |  |  | - |  |  | - |  |  | 629 |  |  |  | 544 |  |  |  | 581 |  |  | - |  |  | - |  |  | 581 |
Long-term debt2 |  |  | 7,600 |  |  |  | 8,354 |  |  | - |  |  | 7,369 |  |  | 985 |  |  |  | 7,229 |  |  |  | 8,347 |  |  | - |  |  | 7,321 |  |  | 1,026 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt3 |  | $ | 4,633 |  |  | $ | 5,046 |  | $ | - |  | $ | 4,061 |  | $ | 985 |  |  | $ | 4,338 |  |  | $ | 5,015 |  | $ | - |  | $ | 3,989 |  | $ | 1,026 |
1 Includes current portion of notes receivable of $58 million at September 3 0, 2013 and $40 million at December 31, 2012.
2 Includes current portion of long-term debt of $511 million at September 3 0, 2013 and $519 million at December 31, 2012.
3 Includes current portion of long-term debt of $42 million at September 3 0, 2013 and $41 million at December 31, 2012.
Schedule Of Investment Securities |
In Millions
| September 30, 2013 |  | December 31, 2012 |
|  | 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 |  | $ | 137 |  | $ | - |  | $ | - |  | $ | 137 |  |  | $ | 123 |  | $ | 3 |  | $ | - |  | $ | 126 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 10 |  |  | - |  |  | - |  |  | 10 |  |  |  | 9 |  |  | 1 |  |  | - |  |  | 10 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 96 |  | $ | - |  | $ | - |  | $ | 96 |  |  | $ | 83 |  | $ | 2 |  | $ | - |  | $ | 85 |
CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
common stock |  |  | 5 |  |  | 24 |  |  | - |  |  | 29 |  |  |  | 6 |  |  | 26 |  |  | - |  |  | 32 |

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