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Financings And Capitalization (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2017 USD ($)
Financing And Capitalization [Line Items] |  |
Unrestricted retained earnings | $ 4,400,000,000 |
Common stock dividends from Consumers | 148,000,000 |
Term Loan [Member] |  |
Financing And Capitalization [Line Items] |  |
Debt issuance | $ 180,000,000 |
Debt instrument, extension term | 1 year |
Consumers Energy Company [Member] |  |
Financing And Capitalization [Line Items] |  |
Unrestricted retained earnings | $ 1,100,000,000 |
Consumers Energy Company [Member] | Commercial Paper [Member] |  |
Financing And Capitalization [Line Items] |  |
Short-term debt, authorized borrowings | 500,000,000 |
Short-term borrowings outstanding | 0 |
Revolving Credit Facilities May 27, 2021 [Member] | CMS Energy [Member] |  |
Financing And Capitalization [Line Items] |  |
Amount of Facility | 550,000,000 | [1]
Revolving Credit Facilities May 27, 2021 [Member] | Consumers Energy Company [Member] |  |
Financing And Capitalization [Line Items] |  |
Amount of Facility | $ 650,000,000 |
[1] | During the three months ended March 31, 2017, CMS Energy's average borrowings totaled $85 million with a weighted-average interest rate of 2.02 percent. Obligations under this facility are secured by Consumers common stock.

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