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Financings And Capitalization (Major Long-Term Debt Transactions) (Details) (CMS Energy [Member], USD $) | 6 Months Ended
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Jun. 30, 2014
Debt Instrument [Line Items] |  |
Debt issuance, principal | $ 550,000,000 |
Senior Notes 6.875% Due December 2015 [Member] |  |
Debt Instrument [Line Items] |  |
Debt retirement, principal | 125,000,000 |
Interest rate | 6.875% |
Maturity date | December 2015 |
Loss on extinguishment of debt | 13,000,000 |
Senior Notes 5.500% Due June 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt retirement, principal | 155,000,000 |
Interest rate | 5.50% |
Maturity date | June 2029 |
Debt Issuance [Member] | Senior Notes 3.875% Due March 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuance, principal | 250,000,000 | [1]
Interest rate | 3.875% | [1]
Debt issuance date | February 2014 | [1]
Maturity date | March 2024 | [1]
Debt Issuance [Member] | Senior Notes 4.875% Due March 2044 [Member] |  |
Debt Instrument [Line Items] |  |
Debt issuance, principal | 300,000,000 | [1]
Interest rate | 4.875% | [1]
Debt issuance date | February 2014 | [1]
Maturity date | March 2044 | [1]
Debt Retirements [Member] |  |
Debt Instrument [Line Items] |  |
Debt retirement, principal | 280,000,000 |
Debt Retirements [Member] | Senior Notes 6.875% Due December 2015 [Member] |  |
Debt Instrument [Line Items] |  |
Debt retirement, principal | 125,000,000 | [2]
Interest rate | 6.875% | [2]
Debt retirement date | April 2014 | [2]
Maturity date | December 2015 | [2]
Debt Retirements [Member] | Senior Notes 5.500% Due June 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt retirement, principal | $ 155,000,000 |
Interest rate | 5.50% |
Debt retirement date | June 2014 |
Maturity date | June 2029 |
[1] | CMS Energy used a portion of these proceeds to retire its $125 million 6.875 percent senior notes due December 2015 and its $155 million 5.5 percent convertible senior notes due June 2029. CMS Energy intends to use the remaining proceeds for general corporate purposes.
[2] | CMS Energy retired this debt at a premium and recorded a loss on extinguishment of $13 million in other expense on its consolidated statements of income.

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- Definition Date when the debt instrument was partially or fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). + References No definition available. + Details
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