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Financings And Capitalization (Narrative) (Details) | 6 Months Ended
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Jun. 30, 2016 USD ($)
Financing And Capitalization [Line Items] |  |
Unrestricted retained earnings | $ 4,200,000,000 |
Common stock dividends from Consumers | 213,000,000 |
Aggregate sales price of an equity offering program | 100,000,000 |
Term Loan [Member] |  |
Financing And Capitalization [Line Items] |  |
Debt issuance | $ 180,000,000 |
Debt instrument, extension term | 1 year |
CMS Energy [Member] |  |
Financing And Capitalization [Line Items] |  |
Debt issuance | $ 300,000,000 |
Consumers Energy Company [Member] |  |
Financing And Capitalization [Line Items] |  |
Unrestricted retained earnings | 974,000,000 |
Consumers Energy Company [Member] | Short-Term Borrowings [Member] |  |
Financing And Capitalization [Line Items] |  |
Maximum limitation on outstanding securities | 800,000,000 |
Consumers Energy Company [Member] | Long-term Debt [Member] |  |
Financing And Capitalization [Line Items] |  |
Maximum limitation on outstanding securities | 1,795,000,000 |
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],[2]
Revolving Credit Facilities May 27, 2021 [Member] | Consumers Energy Company [Member] |  |
Financing And Capitalization [Line Items] |  |
Amount of Facility | $ 650,000,000 | [2],[3]
[1] | During the six months ended June 30, 2016, CMS Energy's average borrowings totaled $5 million with a weighted-average interest rate of 1.68 percent. Obligations under this facility are secured by Consumers common stock.
[2] | In May 2016, the expiration date of this revolving credit agreement was extended from 2020 to 2021.
[3] | Obligations under this facility are secured by first mortgage bonds of Consumers.

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