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Financings And Capitalization (Tables) | 3 Months Ended
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Mar. 31, 2014
Summary Of Major Long-Term Debt Transactions |
| Principal |  |  |  |
| (In Millions) | Interest Rate |  | Issue Date | Maturity Date |
Debt issuances |  |  |  |  |  |  |  |
CMS Energy |  |  |  |  |  |  |  |
Senior notes 1 |  | $ | 250 | 3.875 | % | February 2014 | March 2024 |
Senior notes 1 |  |  | 300 | 4.875 |  | February 2014 | March 2044 |
Total CMS Energy parent |  | $ | 550 |  |  |  |  |
| 1 |  | In April 2014, CMS Energy used a portion of these proceeds to retire its $125 million 6.875 percent Senior Notes due December 2015. CMS Energy intends to use the remaining proceeds to retire existing debt and for general corporate purposes.
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.
| 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 |  | $ | 155 |  | $ | 13.55 |  | $ | 17.61 |
Conversions Of Contingently Convertible Securities |
|  |  | Weighted-Average | Shares |
|  | Principal | Conversion | of Common | Cash Paid on |
| Conversion | Converted | Value per $1,000 | Stock Issued | Settlement |
| Date | (In Millions) | of Principal | on Settlement | (In Millions) |
5.50% senior notes due 2029 | February 2014 |  | $ | 17 |  | $ | 1,968 | 605,531 |  | $ | 17 |
Issuance Of Stock |
| Number of | Average | Proceeds |
| Shares Issued | Price per Share | (In Millions) |
March 2014 | 1,070,080 |  | $ | 28.04 |  | $ | 30 |
Consumers Energy Company [Member] |
Summary Of Major Long-Term Debt Transactions |
| Principal |  |  |  |
| (In Millions) | Interest Rate |  | Issue Date | Maturity Date |
Debt issuances |  |  |  |  |  |  |  |
CMS Energy |  |  |  |  |  |  |  |
Senior notes 1 |  | $ | 250 | 3.875 | % | February 2014 | March 2024 |
Senior notes 1 |  |  | 300 | 4.875 |  | February 2014 | March 2044 |
Total CMS Energy parent |  | $ | 550 |  |  |  |  |
| 1 |  | In April 2014, CMS Energy used a portion of these proceeds to retire its $125 million 6.875 percent Senior Notes due December 2015. CMS Energy intends to use the remaining proceeds to retire existing debt and for general corporate purposes.
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.
| 2 |  | Obligations under this facility are secured by FMBs of Consumers.

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- Definition Tabular disclosure of information on an original debt issue that has been converted in a noncash (or part noncash) transaction during the accounting period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. The information may be presented entirely or partially in this block of text or in the associated elements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: 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.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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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=27011957&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 10 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21553-112644 Reference 3: 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=26873400&loc=d3e23780-122690 Reference 4: 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 5: 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 6: 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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 8: 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 9: 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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 Reference 11: 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 12: 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 Reference 13: 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=27012166&loc=d3e187085-122770 Reference 14: 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 + Details
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