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Financings And Capitalization (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2016 | Mar. 31, 2016
Financing And Capitalization [Line Items] |  |  |
Limitation on payment of stock dividends |  |  | $ 4,100,000,000
Common stock dividends from Consumers |  |  | 155,000,000
Aggregate sales price of an equity offering program |  |  | 100,000,000
Term Loan [Member] | Subsequent Event [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 |  |  | 902,000,000
Consumers Energy Company [Member] | Commercial Paper [Member] |  |  |
Financing And Capitalization [Line Items] |  |  |
Short-term debt, authorized borrowings |  |  | 500,000,000
Revolving Credit Facilities May 27, 2020 [Member] | CMS Energy [Member] |  |  |
Financing And Capitalization [Line Items] |  |  |
Amount of Facility | [1] |  | 550,000,000
Revolving Credit Facilities May 27, 2020 [Member] | Consumers Energy Company [Member] |  |  |
Financing And Capitalization [Line Items] |  |  |
Amount of Facility | [2] |  | $ 650,000,000
[1] | During the three months ended March 31, 2016, CMS Energy's average borrowings totaled $10 million with a weighted-average interest rate of 1.68 percent. Obligations under this facility are secured by Consumers common stock.
[2] | Obligations under this facility are secured by first mortgage bonds of Consumers.

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