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Financings And Capitalization (Tables) | 12 Months Ended
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Dec. 31, 2013
Summary Of Long-Term Debt Outstanding |
In Millions
| Interest Rate (%) |  | Maturity | 2013 | 2012 |
CMS Energy |  |  |  |  |  |  |  |  |  |
Senior notes | 2.750 | 1 | 2014 |  | $ | - |  | $ | 250 |
| 6.875 |  | 2015 |  |  | 125 |  |  | 125 |
| 4.250 |  | 2015 |  |  | 250 |  |  | 250 |
| 6.550 |  | 2017 |  |  | 250 |  |  | 250 |
| 5.050 |  | 2018 |  |  | 250 |  |  | 250 |
| 8.750 |  | 2019 |  |  | 300 |  |  | 300 |
| 6.250 |  | 2020 |  |  | 300 |  |  | 300 |
| 5.050 |  | 2022 |  |  | 300 |  |  | 300 |
| 5.500 | 2 | 2029 |  |  | 172 |  |  | 172 |
| 4.700 |  | 2043 |  |  | 250 |  |  | - |
Total CMS Energy senior notes |  |  |  |  | $ | 2,197 |  | $ | 2,197 |
Term loan facility | variable | 3 | 2016 |  |  | 180 |  |  | 180 |
Total CMS Energy parent |  |  |  |  | $ | 2,377 |  | $ | 2,377 |
Consumers |  |  |  |  | $ | 4,625 |  | $ | 4,341 |
Other CMS Energy subsidiaries |  |  |  |  |  |  |  |  |  |
EnerBank certificates of deposits | 1.095 | 4 | 2014-2021 |  | $ | 652 |  | $ | 527 |
Total other CMS Energy subsidiaries |  |  |  |  | $ | 652 |  | $ | 527 |
Total CMS Energy principal amount outstanding |  |  |  |  | $ | 7,654 |  | $ | 7,245 |
Current amounts |  |  |  |  |  | (541) |  |  | (519) |
Net unamortized discounts |  |  |  |  |  | (12) |  |  | (16) |
Total CMS Energy long-term debt |  |  |  |  | $ | 7,101 |  | $ | 6,710 |
| 1 |  | In September 2013, CMS Energy retired its 2.75 percent senior notes.
| 2 |  | CMS Energy’s contingently convertible notes. See the “Contingently Convertible Securities” section in this Note for further discussion of the conversion features.
| 3 |  | Outstanding borrowings bear interest at an annual interest rate of LIBOR plus 1.75 percent (1.92 percent at December 31, 2013).
| 4 |  | The weighted-average interest rate for EnerBank’s certificates of deposit was 1.09 percent at December 31, 2013 and 1.16 percent at December 31, 2012. EnerBank’s primary deposit product consists of brokered certificates of deposit with varying maturities and having a face value of $1,000.
Summary Of Major Long-Term Debt Transactions |
| Principal |  | Issue/Retirement |  |
| (In Millions) | Interest Rate |  | Date | Maturity Date |
Debt issuances |  |  |  |  |  |  |  |
CMS Energy |  |  |  |  |  |  |  |
Senior notes |  | $ | 250 | 4.700 | % | March 2013 | March 2043 |
Total CMS Energy parent |  | $ | 250 |  |  |  |  |
Consumers |  |  |  |  |  |  |  |
FMBs |  | $ | 425 | 3.950 | % | May 2013 | May 2043 |
FMBs |  |  | 325 | 3.375 | % | August 2013 | August 2023 |
Total Consumers |  | $ | 750 |  |  |  |  |
Total debt issuances |  | $ | 1,000 |  |  |  |  |
Debt retirements |  |  |  |  |  |  |  |
CMS Energy |  |  |  |  |  |  |  |
Senior notes |  | $ | 250 | 2.750 | % | September 2013 | May 2014 |
Total CMS Energy parent |  | $ | 250 |  |  |  |  |
Consumers |  |  |  |  |  |  |  |
FMBs |  | $ | 200 | 6.000 | % | June 2013 | February 2014 |
FMBs |  |  | 225 | 5.000 | % | June 2013 | March 2015 |
Total Consumers |  | $ | 425 |  |  |  |  |
Total debt retirements |  | $ | 675 |  |  |  |  |
Debt Maturities |
In Millions
| 2014 | 2015 | 2016 | 2017 | 2018 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ | 368 |  | $ | 599 |  | $ | 608 |  | $ | 657 |  | $ | 786 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ | 43 |  | $ | 99 |  | $ | 350 |  | $ | 350 |  | $ | 498 |
Revolving Credit Facilities |
In Millions
|  |  | Letters of Credit |
Expiration Date | Amount of Facility | Amount Borrowed | Outstanding | Amount Available |
CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |
December 20, 2018 1 |  | $ | 550 |  | $ | - |  | $ | 2 |  | $ | 548 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |
December 20, 2018 2 |  | $ | 650 |  | $ | - |  | $ | - |  | $ | 650 |
September 9, 2014 2 |  |  | 30 |  |  | - |  |  | 30 |  |  | - |
| 1 |  | Obligations under this facility are secured by Consumers common stock. CMS Energy’s average borrowings during the year ended December 31, 2013 were $4 million, with a weighted-average annual interest rate of 1.67 percent, representing LIBOR plus 1.50 percent.
| 2 |  | Obligations under this facility are secured by FMBs of Consumers.
Contingently Convertible Securities |
|  | Outstanding | Adjusted | Adjusted |
Security | Maturity | (In Millions) | Conversion Price | Trigger Price |
5.50% senior notes | 2029 |  | $ | 172 |  | $ | 13.55 |  | $ | 17.61 |
Issuance Of Stock |
| Number of | Average | Proceeds |
| Shares Issued | Price per Share | (In Millions) |
June 2011 | 762,925 |  | $ | 19.66 |  | $ | 15 |
June 2012 | 650,235 |  |  | 23.07 |  |  | 15 |
March 2013 | 735,873 |  |  | 27.18 |  |  | 20 |
Total | 2,149,033 |  | $ | 23.27 |  | $ | 50 |
Consumers Energy Company [Member] |
Summary Of Long-Term Debt Outstanding |
In Millions
| Interest Rate (%) |  | Maturity | 2013 | 2012 |
Consumers |  |  |  |  |  |  |  |  |  |
FMBs 1 | 6.000 | 2 | 2014 |  | $ | - |  | $ | 200 |
| 5.000 | 2 | 2015 |  |  | - |  |  | 225 |
| 2.600 |  | 2015 |  |  | 50 |  |  | 50 |
| 5.500 |  | 2016 |  |  | 350 |  |  | 350 |
| 5.150 |  | 2017 |  |  | 250 |  |  | 250 |
| 3.210 |  | 2017 |  |  | 100 |  |  | 100 |
| 5.650 |  | 2018 |  |  | 250 |  |  | 250 |
| 6.125 |  | 2019 |  |  | 350 |  |  | 350 |
| 6.700 |  | 2019 |  |  | 500 |  |  | 500 |
| 5.650 |  | 2020 |  |  | 300 |  |  | 300 |
| 3.770 |  | 2020 |  |  | 100 |  |  | 100 |
| 5.300 |  | 2022 |  |  | 250 |  |  | 250 |
| 2.850 |  | 2022 |  |  | 375 |  |  | 375 |
| 3.375 |  | 2023 |  |  | 325 |  |  | - |
| 3.190 |  | 2024 |  |  | 52 |  |  | 52 |
| 3.390 |  | 2027 |  |  | 35 |  |  | 35 |
| 5.800 |  | 2035 |  |  | 175 |  |  | 175 |
| 6.170 |  | 2040 |  |  | 50 |  |  | 50 |
| 4.970 |  | 2040 |  |  | 50 |  |  | 50 |
| 4.310 |  | 2042 |  |  | 263 |  |  | 263 |
| 3.950 |  | 2043 |  |  | 425 |  |  | - |
|  |  |  |  | $ | 4,250 |  | $ | 3,925 |
Senior notes | 6.875 |  | 2018 |  |  | 180 |  |  | 180 |
Securitization bonds | 5.760 | 3 | 2015 |  |  | 92 |  |  | 133 |
Tax-exempt pollution control revenue bonds | various |  | 2018-2035 |  |  | 103 |  |  | 103 |
Total Consumers principal amount outstanding |  |  |  |  | $ | 4,625 |  | $ | 4,341 |
Current amounts |  |  |  |  |  | (43) |  |  | (41) |
Net unamortized discounts |  |  |  |  |  | (3) |  |  | (3) |
Total Consumers long-term debt |  |  |  |  | $ | 4,579 |  | $ | 4,297 |
| 1 |  | The weighted-average interest rate for Consumers’ FMBs was 4.90 percent at December 31, 2013 and 5.19 percent at December 31, 2012.
| 2 |  | In June 2013, Consumers retired its 6.00 percent and 5.00 percent FMBs.
| 3 |  | The weighted-average interest rate for Consumers’ Securitization bonds was 5.76 percent at December 31, 2013 and 5.72 percent at December 31, 2012.
Summary Of Major Long-Term Debt Transactions |
| Principal |  | Issue/Retirement |  |
| (In Millions) | Interest Rate |  | Date | Maturity Date |
Debt issuances |  |  |  |  |  |  |  |
CMS Energy |  |  |  |  |  |  |  |
Senior notes |  | $ | 250 | 4.700 | % | March 2013 | March 2043 |
Total CMS Energy parent |  | $ | 250 |  |  |  |  |
Consumers |  |  |  |  |  |  |  |
FMBs |  | $ | 425 | 3.950 | % | May 2013 | May 2043 |
FMBs |  |  | 325 | 3.375 | % | August 2013 | August 2023 |
Total Consumers |  | $ | 750 |  |  |  |  |
Total debt issuances |  | $ | 1,000 |  |  |  |  |
Debt retirements |  |  |  |  |  |  |  |
CMS Energy |  |  |  |  |  |  |  |
Senior notes |  | $ | 250 | 2.750 | % | September 2013 | May 2014 |
Total CMS Energy parent |  | $ | 250 |  |  |  |  |
Consumers |  |  |  |  |  |  |  |
FMBs |  | $ | 200 | 6.000 | % | June 2013 | February 2014 |
FMBs |  |  | 225 | 5.000 | % | June 2013 | March 2015 |
Total Consumers |  | $ | 425 |  |  |  |  |
Total debt retirements |  | $ | 675 |  |  |  |  |
Debt Maturities |
In Millions
| 2014 | 2015 | 2016 | 2017 | 2018 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ | 368 |  | $ | 599 |  | $ | 608 |  | $ | 657 |  | $ | 786 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ | 43 |  | $ | 99 |  | $ | 350 |  | $ | 350 |  | $ | 498 |
Revolving Credit Facilities |
In Millions
|  |  | Letters of Credit |
Expiration Date | Amount of Facility | Amount Borrowed | Outstanding | Amount Available |
CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |
December 20, 2018 1 |  | $ | 550 |  | $ | - |  | $ | 2 |  | $ | 548 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |
December 20, 2018 2 |  | $ | 650 |  | $ | - |  | $ | - |  | $ | 650 |
September 9, 2014 2 |  |  | 30 |  |  | - |  |  | 30 |  |  | - |
| 1 |  | Obligations under this facility are secured by Consumers common stock. CMS Energy’s average borrowings during the year ended December 31, 2013 were $4 million, with a weighted-average annual interest rate of 1.67 percent, representing LIBOR plus 1.50 percent.
| 2 |  | Obligations under this facility are secured by FMBs of Consumers.
Issuance Of Stock |
|  |  |  | Optional | Number of | Balance |
|  |  |  | Redemption | Shares | Outstanding |
| Series | Price | Outstanding | (In Millions) |
December 31 |  |  |  |  |  |  |  | 2013 | 2012 |
Cumulative, $100 par value, authorized 7,500,000 shares, with no mandatory redemption |  | $ | 4.50 |  | $ | 110.00 | 373,148 |  | $ | 37 |  | $ | 37 |
|  |  | 4.16 |  |  | 103.25 | 68,451 |  |  | - |  |  | 7 |
Total preferred stock of Consumers |  |  |  |  |  |  |  |  | $ | 37 |  | $ | 44 |

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