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Financings And Capitalization (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary Of Long-Term Debt Outstanding |
In Millions
| Interest Rate (%) |  | Maturity | 2012 | 2011 |
CMS Energy |  |  |  |  |  |  |  |  |  |
Senior notes | variable | 1 | 2013 |  | $ | - |  | $ | 150 |
| 2.750 |  | 2014 |  |  | 250 |  |  | 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 |  |  | - |
| 2.875 | 2 | 2024 |  |  | - |  |  | 226 |
| 5.500 | 2 | 2029 |  |  | 172 |  |  | 172 |
Total CMS Energy senior notes |  |  |  |  | $ | 2,197 |  | $ | 2,273 |
Term loan facility | variable | 3 | 2016 |  |  | 180 |  |  | - |
Total CMS Energy parent |  |  |  |  | $ | 2,377 |  | $ | 2,273 |
Consumers |  |  |  |  | $ | 4,341 |  | $ | 4,329 |
Other CMS Energy subsidiaries |  |  |  |  |  |  |  |  |  |
EnerBank certificates of deposits | 1.164 | 4 | 2013-2020 |  | $ | 527 |  | $ | 462 |
Trust preferred securities | 7.750 | 5 | 2027 |  |  | - |  |  | 29 |
Total other CMS Energy subsidiaries |  |  |  |  | $ | 527 |  | $ | 491 |
Total CMS Energy principal amount outstanding |  |  |  |  | $ | 7,245 |  | $ | 7,093 |
Current amounts |  |  |  |  |  | (519) |  |  | (1,033) |
Net unamortized discounts |  |  |  |  |  | (16) |  |  | (20) |
Total CMS Energy long-term debt |  |  |  |  | $ | 6,710 |  | $ | 6,040 |
1 | CMS Energy’s variable-rate senior notes bore interest at three-month LIBOR plus 95 basis points (1.35 percent at December 31, 2011). In July 2012, CMS Energy retired these notes.
2 | CMS Energy’s contingently convertible notes. CMS Energy’s 2.875 percent senior notes were converted in January and April 2012. 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 2.50 percent (2.71 percent at December 31, 2012). In February 2013, the term loan facility was amended, reducing the annual interest rate to LIBOR plus 2.00 percent.
4 | The weighted-average interest rate for EnerBank’s certificates of deposit was 1.16 percent at December 31, 2012 and 1.33 percent at December 31, 2011. EnerBank’s primary deposit product consists of brokered certificates of deposit with varying maturities and having a face value of $1,000.
5 | In February 2012, CMS Energy retired the 7.75 percent Trust Preferred Securities.
Summary Of Major Long-Term Debt Transactions |
| Principal |  | Issue/Retirement |  |
| (In Millions) | Interest Rate |  | Date | Maturity Date |
Debt issuances |  |  |  |  |  |  |  |
CMS Energy |  |  |  |  |  |  |  |
Senior notes |  | $ | 300 | 5.050 | % | March 2012 | March 2022 |
Term loan facility1 |  |  | 180 | variable |  | February 2012 and July 2012 | December 2016 |
Total CMS Energy parent |  |  | 480 |  |  |  |  |
Consumers |  |  |  |  |  |  |  |
FMB |  |  | 375 | 2.850 | % | May 2012 | May 2022 |
Term loan facility2 |  |  | 350 | variable |  | July 2012 | March 2013 |
Tax-exempt bonds3 |  |  | 68 | variable |  | August 2012 | April 2018 |
Tax-exempt bonds3 |  |  | 35 | variable |  | August 2012 | April 2035 |
FMB |  |  | 52 | 3.190 | % | December 2012 | December 2024 |
FMB |  |  | 35 | 3.390 | % | December 2012 | December 2027 |
FMB |  |  | 263 | 4.310 | % | December 2012 | December 2042 |
Total Consumers |  |  | 1,178 |  |  |  |  |
Total debt issuances |  | $ | 1,658 |  |  |  |  |
Debt retirements |  |  |  |  |  |  |  |
CMS Energy |  |  |  |  |  |  |  |
Contingently convertible senior notes4 |  | $ | 226 | 2.875 | % | January 2012 and April 2012 | December 2024 |
Trust Preferred Securities |  |  | 29 | 7.750 | % | February 2012 | July 2027 |
Senior notes |  |  | 150 | variable |  | July 2012 | January 2013 |
Total CMS Energy parent |  |  | 405 |  |  |  |  |
Consumers |  |  |  |  |  |  |  |
FMB |  |  | 300 | 5.000 | % | February 2012 | February 2012 |
FMB |  |  | 375 | 5.375 | % | May 2012 | April 2013 |
Tax-exempt bonds3 |  |  | 68 | variable |  | August 2012 | April 2018 |
Tax-exempt bonds3 |  |  | 35 | variable |  | August 2012 | April 2035 |
Term loan facility2 |  |  | 350 | variable |  | December 2012 | March 2013 |
Total Consumers |  |  | 1,128 |  |  |  |  |
Total debt retirements |  | $ | 1,533 |  |  |  |  |
1 | Outstanding borrowings bear interest at an annual interest rate of LIBOR plus 2.50 percent (2.71 percent at December 31, 2012). CMS Energy used these proceeds to retire the 7.75 percent Trust Preferred Securities and floating-rate senior notes due January 2013. In February 2013, the term loan facility was amended, reducing the annual interest rate to LIBOR plus 2.00 percent.
2 | In June 2012, Consumers entered into a short-term credit agreement permitting Consumers to borrow up to $375 million. This agreement was terminated using proceeds from FMBs issued in December 2012.
3 | In August 2012, Consumers utilized the Michigan Strategic Fund for the issuance of $68 million and $35 million of tax-exempt Michigan Strategic Fund revenue bonds. The bonds, which are backed by letters of credit and collateralized by Consumers’ FMBs, are subject to optional tender by the holders that would result in remarketing. Consumers used the proceeds to redeem $103 million of tax-exempt bonds in August 2012.
4 | CMS Energy’s contingently convertible notes. See the “Contingently Convertible Securities” section in this Note for further discussion of the conversions.
Debt Maturities |
In Millions
| 2013 | 2014 | 2015 | 2016 | 2017 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ | 347 |  | $ | 583 |  | $ | 738 |  | $ | 563 |  | $ | 630 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ | 41 |  | $ | 243 |  | $ | 324 |  | $ | 350 |  | $ | 350 |
Revolving Credit Facilities |
In Millions
|  |  | Letters of Credit |
Expiration Date | Amount of Facility | Amount Borrowed | Outstanding | Amount Available |
CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |
December 21, 20171 |  | $ | 550 |  | $ | - |  | $ | 2 |  | $ | 548 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |
December 21, 20172 |  | $ | 500 |  | $ | - |  | $ | 2 |  | $ | 498 |
April 18, 20172 |  |  | 150 |  |  | - |  |  | - |  |  | 150 |
September 9, 20142 |  |  | 30 |  |  | - |  |  | 30 |  |  | - |
1 | Obligations under this facility are secured by Consumers common stock. CMS Energy’s average borrowings during the year ended December 31, 2012 were $12 million, with a weighted-average annual interest rate of 2.26 percent, representing LIBOR plus 2.00 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 |  | $ | 13.94 |  | $ | 18.12 |
Conversions Of Contingently Convertible Securities Details |
|  |  | Conversion | Shares |
|  | Principal | Value per | of Common | Cash Paid on |
| Conversion | Converted | $1,000 of | Stock Issued | Settlement |
| Date | (In Millions) | Principal | on Settlement | (In Millions) |
2.875% senior notes due 2024 | January 2012 |  | $ | 73 |  | $ | 1,738.99 | 2,464,138 |  | $ | 73 |
| April 2012 |  |  | 153 |  |  | 1,774.98 | 5,381,349 |  |  | 153 |
Consumers Energy Company [Member] |
Summary Of Long-Term Debt Outstanding |
In Millions
| Interest Rate (%) |  | Maturity | 2012 | 2011 |
Consumers |  |  |  |  |  |  |  |  |  |
FMBs1 | 5.000 |  | 2012 |  | $ | - |  | $ | 300 |
| 5.375 | 2 | 2013 |  |  | - |  |  | 375 |
| 6.000 |  | 2014 |  |  | 200 |  |  | 200 |
| 5.000 |  | 2015 |  |  | 225 |  |  | 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 |  |  | - |
| 3.190 |  | 2024 |  |  | 52 |  |  | - |
| 3.390 |  | 2027 |  |  | 35 |  |  | - |
| 5.800 |  | 2035 |  |  | 175 |  |  | 175 |
| 6.170 |  | 2040 |  |  | 50 |  |  | 50 |
| 4.970 |  | 2040 |  |  | 50 |  |  | 50 |
| 4.310 |  | 2042 |  |  | 263 |  |  | - |
|  |  |  |  | $ | 3,925 |  | $ | 3,875 |
Senior notes | 6.875 |  | 2018 |  |  | 180 |  |  | 180 |
Securitization bonds | 5.718 | 3 | 2013-2015 |  |  | 133 |  |  | 171 |
Tax-exempt pollution control revenue bonds | various |  | 2018-2035 |  |  | 103 |  |  | 103 |
Total Consumers principal amount outstanding |  |  |  |  | $ | 4,341 |  | $ | 4,329 |
Current amounts |  |  |  |  |  | (41) |  |  | (339) |
Net unamortized discounts |  |  |  |  |  | (3) |  |  | (3) |
Total Consumers long-term debt |  |  |  |  | $ | 4,297 |  | $ | 3,987 |
1 | The weighted-average interest rate for Consumers’ FMBs was 5.19 percent at December 31, 2012 and 5.52 percent at December 31, 2011.
2 | In May 2012, Consumers retired its 5.375 percent FMBs.
3 | The weighted-average interest rate for Consumers’ Securitization bonds was 5.72 percent at December 31, 2012 and 5.65 percent at December 31, 2011.
Summary Of Major Long-Term Debt Transactions |
| Principal |  | Issue/Retirement |  |
| (In Millions) | Interest Rate |  | Date | Maturity Date |
Debt issuances |  |  |  |  |  |  |  |
CMS Energy |  |  |  |  |  |  |  |
Senior notes |  | $ | 300 | 5.050 | % | March 2012 | March 2022 |
Term loan facility1 |  |  | 180 | variable |  | February 2012 and July 2012 | December 2016 |
Total CMS Energy parent |  |  | 480 |  |  |  |  |
Consumers |  |  |  |  |  |  |  |
FMB |  |  | 375 | 2.850 | % | May 2012 | May 2022 |
Term loan facility2 |  |  | 350 | variable |  | July 2012 | March 2013 |
Tax-exempt bonds3 |  |  | 68 | variable |  | August 2012 | April 2018 |
Tax-exempt bonds3 |  |  | 35 | variable |  | August 2012 | April 2035 |
FMB |  |  | 52 | 3.190 | % | December 2012 | December 2024 |
FMB |  |  | 35 | 3.390 | % | December 2012 | December 2027 |
FMB |  |  | 263 | 4.310 | % | December 2012 | December 2042 |
Total Consumers |  |  | 1,178 |  |  |  |  |
Total debt issuances |  | $ | 1,658 |  |  |  |  |
Debt retirements |  |  |  |  |  |  |  |
CMS Energy |  |  |  |  |  |  |  |
Contingently convertible senior notes4 |  | $ | 226 | 2.875 | % | January 2012 and April 2012 | December 2024 |
Trust Preferred Securities |  |  | 29 | 7.750 | % | February 2012 | July 2027 |
Senior notes |  |  | 150 | variable |  | July 2012 | January 2013 |
Total CMS Energy parent |  |  | 405 |  |  |  |  |
Consumers |  |  |  |  |  |  |  |
FMB |  |  | 300 | 5.000 | % | February 2012 | February 2012 |
FMB |  |  | 375 | 5.375 | % | May 2012 | April 2013 |
Tax-exempt bonds3 |  |  | 68 | variable |  | August 2012 | April 2018 |
Tax-exempt bonds3 |  |  | 35 | variable |  | August 2012 | April 2035 |
Term loan facility2 |  |  | 350 | variable |  | December 2012 | March 2013 |
Total Consumers |  |  | 1,128 |  |  |  |  |
Total debt retirements |  | $ | 1,533 |  |  |  |  |
1 | Outstanding borrowings bear interest at an annual interest rate of LIBOR plus 2.50 percent (2.71 percent at December 31, 2012). CMS Energy used these proceeds to retire the 7.75 percent Trust Preferred Securities and floating-rate senior notes due January 2013. In February 2013, the term loan facility was amended, reducing the annual interest rate to LIBOR plus 2.00 percent.
2 | In June 2012, Consumers entered into a short-term credit agreement permitting Consumers to borrow up to $375 million. This agreement was terminated using proceeds from FMBs issued in December 2012.
3 | In August 2012, Consumers utilized the Michigan Strategic Fund for the issuance of $68 million and $35 million of tax-exempt Michigan Strategic Fund revenue bonds. The bonds, which are backed by letters of credit and collateralized by Consumers’ FMBs, are subject to optional tender by the holders that would result in remarketing. Consumers used the proceeds to redeem $103 million of tax-exempt bonds in August 2012.
4 | CMS Energy’s contingently convertible notes. See the “Contingently Convertible Securities” section in this Note for further discussion of the conversions.
Debt Maturities |
In Millions
| 2013 | 2014 | 2015 | 2016 | 2017 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ | 347 |  | $ | 583 |  | $ | 738 |  | $ | 563 |  | $ | 630 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ | 41 |  | $ | 243 |  | $ | 324 |  | $ | 350 |  | $ | 350 |
Revolving Credit Facilities |
In Millions
|  |  | Letters of Credit |
Expiration Date | Amount of Facility | Amount Borrowed | Outstanding | Amount Available |
CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |
December 21, 20171 |  | $ | 550 |  | $ | - |  | $ | 2 |  | $ | 548 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |
December 21, 20172 |  | $ | 500 |  | $ | - |  | $ | 2 |  | $ | 498 |
April 18, 20172 |  |  | 150 |  |  | - |  |  | - |  |  | 150 |
September 9, 20142 |  |  | 30 |  |  | - |  |  | 30 |  |  | - |
1 | Obligations under this facility are secured by Consumers common stock. CMS Energy’s average borrowings during the year ended December 31, 2012 were $12 million, with a weighted-average annual interest rate of 2.26 percent, representing LIBOR plus 2.00 percent.
2 | Obligations under this facility are secured by FMBs of Consumers.
Preferred Stock Of Subsidiary |
|  |  |  | Optional | Number of | Balance |
|  |  |  | Redemption | Shares | Outstanding |
December 31, 2012 and 2011 | Series | Price | Outstanding | In Millions |
Cumulative, $100 par value, authorized 7,500,000 shares, with no mandatory redemption |  | $ | 4.16 |  | $ | 103.25 | 68,451 |  | $ | 7 |
|  |  | 4.50 |  |  | 110.00 | 373,148 |  |  | 37 |
Total preferred stock of Consumers |  |  |  |  |  |  |  |  | $ | 44 |

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- Definition Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14643745&loc=d3e177068-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21553-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 150 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d),(e)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6403732&loc=d3e21300-112643 + Details
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