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Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2011
Schedule of Cost/Carrying Amounts and Fair Values of Long-Term Financial Instruments |
In Millions
|  | September 30, 2011 |  |  | December 31, 2010
|  | Cost or |  |  |  |  |  |  | Cost or |  |  |  |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities held to maturity |  | $ | 7 |  |  | $ | 8 |  |  | $ | 5 |  |  | $ | 6 |
Securities available for sale |  |  | 113 |  |  |  | 113 |  |  |  | 90 |  |  |  | 90 |
Notes receivable1 |  |  | 439 |  |  |  | 459 |  |  |  | 386 |  |  |  | 407 |
Long-term debt2 |  |  | 7,153 |  |  |  | 8,093 |  |  |  | 7,174 |  |  |  | 7,861 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale |  | $ | 81 |  |  | $ | 105 |  |  | $ | 64 |  |  | $ | 90 |
Long-term debt3 |  |  | 4,335 |  |  |  | 4,901 |  |  |  | 4,525 |  |  |  | 4,891 |
1 Includes current portion of notes receivable of $16 million at September 30, 2011 and $11 million at December 31, 2010. 2 Includes current portion of long-term debt of $1,116 million at September 30, 2011 and $726 million at December 31, 2010. 3 Includes current portion of long-term debt of $338 million at September 30, 2011 and $37 million at December 31, 2010.
Schedule of Investment Securities |
In Millions
|  | September 30, 2011 |  |  | December 31, 2010
|  |  |  |  |  | Unrealized |  |  | Unrealized |  |  |  |  |  |  |  |  |  |  | Unrealized |  |  | Unrealized |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |  |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
CMS Energy, including consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual fund |  | $ | 88 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 87 |  |  | $ | 62 |  |  | $ | — |  |  | $ | — |  |  | $ | 62 |
State and municipal bonds |  |  | 25 |  |  |  | 1 |  |  |  | — |  |  |  | 26 |  |  |  | 28 |  |  |  | — |  |  |  | — |  |  |  | 28 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 7 |  |  |  | 1 |  |  |  | — |  |  |  | 8 |  |  |  | 5 |  |  |  | 1 |  |  |  | — |  |  |  | 6 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual fund |  | $ | 57 |  |  | $ | — |  |  | $ | — |  |  | $ | 57 |  |  | $ | 39 |  |  | $ | — |  |  | $ | — |  |  | $ | 39 |
State and municipal bonds |  |  | 17 |  |  |  | — |  |  |  | — |  |  |  | 17 |  |  |  | 17 |  |  |  | — |  |  |  | — |  |  |  | 17 |
CMS Energy common stock |  |  | 7 |  |  |  | 24 |  |  |  | — |  |  |  | 31 |  |  |  | 8 |  |  |  | 26 |  |  |  | — |  |  |  | 34 |
Schedule of Proceeds and Gross Realized Gains/Losses from Sales of Available-for-Sale Securities |
In Millions
|  | Three months ended |  | Nine months ended
September 30 |  | 2011 |  | 2010 |  | 2011 |  | 2010
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities1 |  | $ | 1 |  |  | $ — |  | $ | 2 |  |  | $ | 1 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities1 |  | $ | 1 |  |  | $ — |  | $ | 1 |  |  | $ | — |
1 All of the proceeds related to sales of investments that were held within the SERP and classified as available for sale. Realized losses on these sales were less than $1 million for both CMS Energy and Consumers during each period.
Schedule of Contractual Maturities of Investments |
In Millions
|  | CMS Energy, |  |  |  |
|  | including Consumers |  |  | Consumers |
Due one year or less |  | $ | 2 |  |  | $ | 1 |
Due after one year through five years |  |  | 9 |  |  |  | 6 |
Due after five years through ten years |  |  | 12 |  |  |  | 8 |
Due after ten years |  |  | 3 |  |  |  | 2 |
Total |  | $ | 26 |  |  | $ | 17 |
Consumers Energy Company [Member] |
Schedule of Cost/Carrying Amounts and Fair Values of Long-Term Financial Instruments |
In Millions |
|  | September 30, 2011 |  |  | December 31, 2010 |
|  | Cost or |  |  |  |  |  |  | Cost or |  |  |  |
|  | Carrying |  |  |  |  |  |  | Carrying |  |  |  |
|  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities held to maturity |  | $ | 7 |  |  | $ | 7 |  |  | $ | 5 |  |  | $ | 6 |
Securities available for sale |  |  | 113 |  |  |  | 113 |  |  |  | 90 |  |  |  | 90 |
Notes receivable1 |  |  | 439 |  |  |  | 460 |  |  |  | 386 |  |  |  | 407 |
Long-term debt2 |  |  | 7,153 |  |  |  | 8,093 |  |  |  | 7,174 |  |  |  | 7,861 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale |  | $ | 81 |  |  | $ | 105 |  |  | $ | 64 |  |  | $ | 90 |
Long-term debt3 |  |  | 4,336 |  |  |  | 4,901 |  |  |  | 4,525 |  |  |  | 4,891 |
1 |  | Includes current portion of notes receivable of $15 million at September 30, 2011 and $11 million at December 31, 2010.
2 |  | Includes current portion of long-term debt of $1,116 million at September 30, 2011 and $726 million at December 31, 2010.
3 |  | Includes current portion of long-term debt of $338 million at September 30, 2011 and $37 million at December 31, 2010.
Schedule of Investment Securities |
In Millions
|  | September 30, 2011 |  |  | December 31, 2010
|  |  |  |  |  | Unrealized |  |  | Unrealized |  |  |  |  |  |  |  |  |  |  | Unrealized |  |  | Unrealized |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |  |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
CMS Energy, including consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual fund |  | $ | 88 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 87 |  |  | $ | 62 |  |  | $ | — |  |  | $ | — |  |  | $ | 62 |
State and municipal bonds |  |  | 25 |  |  |  | 1 |  |  |  | — |  |  |  | 26 |  |  |  | 28 |  |  |  | — |  |  |  | — |  |  |  | 28 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 7 |  |  |  | 1 |  |  |  | — |  |  |  | 8 |  |  |  | 5 |  |  |  | 1 |  |  |  | — |  |  |  | 6 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual fund |  | $ | 57 |  |  | $ | — |  |  | $ | — |  |  | $ | 57 |  |  | $ | 39 |  |  | $ | — |  |  | $ | — |  |  | $ | 39 |
State and municipal bonds |  |  | 17 |  |  |  | — |  |  |  | — |  |  |  | 17 |  |  |  | 17 |  |  |  | — |  |  |  | — |  |  |  | 17 |
CMS Energy common stock |  |  | 7 |  |  |  | 24 |  |  |  | — |  |  |  | 31 |  |  |  | 8 |  |  |  | 26 |  |  |  | — |  |  |  | 34 |
Schedule of Proceeds and Gross Realized Gains/Losses from Sales of Available-for-Sale Securities |
In Millions |
|  | Three months ended |  |  | Nine months ended |
September 30 |  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities1 |  | $ | 1 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 1 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities1 |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |
1 |  | All of the proceeds related to sales of investments that were held within the SERP and classified as available for sale. Realized losses on these sales were less than $1 million for both CMS Energy and Consumers during each period.
Schedule of Contractual Maturities of Investments |
In Millions
|  | CMS Energy, |  |  |  |
|  | including Consumers |  |  | Consumers |
Due one year or less |  | $ | 2 |  |  | $ | 1 |
Due after one year through five years |  |  | 9 |  |  |  | 6 |
Due after five years through ten years |  |  | 12 |  |  |  | 8 |
Due after ten years |  |  | 3 |  |  |  | 2 |
Total |  | $ | 26 |  |  | $ | 17 |

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