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Financings And Capitalization (Major Long-Term Debt Transactions) (Details) (CMS Energy [Member], USD $) | 1 Months Ended |  | 3 Months Ended
--- | --- | --- | ---
Apr. 24, 2014 Senior Notes 6.875% Due December 2015 [Member] Subsequent Event [Member] | Mar. 31, 2014 Debt Issuance [Member] | Mar. 31, 2014 Debt Issuance [Member] Senior Notes 3.875% Due March 2024 [Member] | Mar. 31, 2014 Debt Issuance [Member] Senior Notes 4.875% Due March 2044 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |
Debt issuance, principal |  | $ 550,000,000 | $ 250,000,000 | [1] | $ 300,000,000 | [1]
Debt retirement, principal | $ 125,000,000 |  |  |  |  |
Interest rate | 6.875% |  | 3.875% | [1] | 4.875% | [1]
Debt issuance date |  |  | February 2014 | [1] | February 2014 | [1]
Maturity date | December 2015 |  | March 2024 | [1] | March 2044 | [1]
[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.

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