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Financial Instruments | 6 Months Ended
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Jun. 30, 2013
Financial Instruments | 5:FINANCIAL INSTRUMENTS Presented in the following table are the carrying amounts and fair values, by level within the fair value hierarchy, of CMS Energy’s and Consumers’ financial instruments that are not recorded at fair value. The table does not include information on cash, cash equivalents, short-term accounts and notes receivable, short-term investments, and current liabilities since the carrying amount s of these items approximate their fair values because of their short-term nature. For information about assets and liabilities recorded at fair value and for additional details regarding the fair value hierarchy, see Note 4, Fair Value Measurements.
In Millions
| June 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 |  |  | 543 |  |  |  | 582 |  |  | - |  |  | - |  |  | 582 |  |  |  | 544 |  |  |  | 581 |  |  | - |  |  | - |  |  | 581 |
Long-term debt2 |  |  | 7,432 |  |  |  | 8,278 |  |  | - |  |  | 7,295 |  |  | 983 |  |  |  | 7,229 |  |  |  | 8,347 |  |  | - |  |  | 7,321 |  |  | 1,026 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt3 |  | $ | 4,318 |  |  | $ | 4,731 |  | $ | - |  | $ | 3,748 |  | $ | 983 |  |  | $ | 4,338 |  |  | $ | 5,015 |  | $ | - |  | $ | 3,989 |  | $ | 1,026 |
1 | Includes current portion of notes receivable of $50 million at June 3 0, 2013 and $40 million at December 31, 2012.
2 | Includes current portion of long-term debt of $737 million at June 3 0, 2013 and $519 million at December 31, 2012.
3 | Includes current portion of long-term debt of $42 million at June 3 0, 2013 and $41 million at December 31, 2012.
Notes receivable consist of EnerBank’s fixed-rate installment loans. EnerBank estimates the fair value of these loans using a discounted cash flows technique that incorporates market interest rates as well as assumptions about the remaining life of the loans and credit risk. CMS Energy and Consumers estimate the fair value of their long-term debt using quoted prices from market trades of the debt, if available. In the absence of quoted prices, CMS Energy and Consumers calculate market yields and prices for the debt using a matrix method that incorporates market data for similarly rated debt. Depending on the information available, other valuation techniques and models may be used that rely on assumptions that cannot be observed or confirmed through market transactions. CMS Energy includes the value of the conversion features in estimating the fair value of its convertible debt, and incorporates, as appropriate, information on the market prices of CMS Energy common stock. The effects of third-party credit enhancements are excluded from the fair value measurements of long-term debt. At June 3 0, 2013 and December 31, 2012, CMS Energy’s long-term debt included $103 million principal amount that was supported by third-party credit enhancements. This entire principal amount was at Consumers. Presented in the following table are CMS Energy’s and Consumers’ investment securities classified as available for sale or held to maturity:
In Millions
| June 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 |  | $ | 138 |  | $ | - |  | $ | 1 |  | $ | 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 |  |  | 25 |  |  | - |  |  | 30 |  |  |  | 6 |  |  | 26 |  |  | - |  |  | 32 |
The mutual funds classified as available for sale hold primarily fixed-income instruments of varying maturities. During the six months ended June 3 0, 2013, CMS Energy contributed $16 million to the DB SERP, which included a contribution of $13 million by Consumers. The contributions were used to acquire additional shares in the mutual funds. Debt securities classified as held to maturity consist primarily of mortgage-backed securities held by EnerBank. Consumers recognized gains of $4 million in January 2013 and $5 million in January 2012 from transferring shares of CMS Energy common stock to a related charitable foundation. The gains reflected the excess of fair value over cost of the stock donated and were included in income.
Consumers Energy Company [Member] |
Financial Instruments | 5:FINANCIAL INSTRUMENTS Presented in the following table are the carrying amounts and fair values, by level within the fair value hierarchy, of CMS Energy’s and Consumers’ financial instruments that are not recorded at fair value. The table does not include information on cash, cash equivalents, short-term accounts and notes receivable, short-term investments, and current liabilities since the carrying amount s of these items approximate their fair values because of their short-term nature. For information about assets and liabilities recorded at fair value and for additional details regarding the fair value hierarchy, see Note 4, Fair Value Measurements.
In Millions
| June 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 |  |  | 543 |  |  |  | 582 |  |  | - |  |  | - |  |  | 582 |  |  |  | 544 |  |  |  | 581 |  |  | - |  |  | - |  |  | 581 |
Long-term debt2 |  |  | 7,432 |  |  |  | 8,278 |  |  | - |  |  | 7,295 |  |  | 983 |  |  |  | 7,229 |  |  |  | 8,347 |  |  | - |  |  | 7,321 |  |  | 1,026 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt3 |  | $ | 4,318 |  |  | $ | 4,731 |  | $ | - |  | $ | 3,748 |  | $ | 983 |  |  | $ | 4,338 |  |  | $ | 5,015 |  | $ | - |  | $ | 3,989 |  | $ | 1,026 |
1 | Includes current portion of notes receivable of $50 million at June 3 0, 2013 and $40 million at December 31, 2012.
2 | Includes current portion of long-term debt of $737 million at June 3 0, 2013 and $519 million at December 31, 2012.
3 | Includes current portion of long-term debt of $42 million at June 3 0, 2013 and $41 million at December 31, 2012.
Notes receivable consist of EnerBank’s fixed-rate installment loans. EnerBank estimates the fair value of these loans using a discounted cash flows technique that incorporates market interest rates as well as assumptions about the remaining life of the loans and credit risk. CMS Energy and Consumers estimate the fair value of their long-term debt using quoted prices from market trades of the debt, if available. In the absence of quoted prices, CMS Energy and Consumers calculate market yields and prices for the debt using a matrix method that incorporates market data for similarly rated debt. Depending on the information available, other valuation techniques and models may be used that rely on assumptions that cannot be observed or confirmed through market transactions. CMS Energy includes the value of the conversion features in estimating the fair value of its convertible debt, and incorporates, as appropriate, information on the market prices of CMS Energy common stock. The effects of third-party credit enhancements are excluded from the fair value measurements of long-term debt. At June 3 0, 2013 and December 31, 2012, CMS Energy’s long-term debt included $103 million principal amount that was supported by third-party credit enhancements. This entire principal amount was at Consumers. Presented in the following table are CMS Energy’s and Consumers’ investment securities classified as available for sale or held to maturity:
In Millions
| June 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 |  | $ | 138 |  | $ | - |  | $ | 1 |  | $ | 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 |  |  | 25 |  |  | - |  |  | 30 |  |  |  | 6 |  |  | 26 |  |  | - |  |  | 32 |
The mutual funds classified as available for sale hold primarily fixed-income instruments of varying maturities. During the six months ended June 3 0, 2013, CMS Energy contributed $16 million to the DB SERP, which included a contribution of $13 million by Consumers. The contributions were used to acquire additional shares in the mutual funds. Debt securities classified as held to maturity consist primarily of mortgage-backed securities held by EnerBank. Consumers recognized gains of $4 million in January 2013 and $5 million in January 2012 from transferring shares of CMS Energy common stock to a related charitable foundation. The gains reflected the excess of fair value over cost of the stock donated and were included in income.

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- Definition The entire disclosure of the fair value of financial instruments and investments in debt and equity securities. + References No definition available. + Details
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