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Financings And Capitalization (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2014 | Jun. 30, 2015
Financing And Capitalization [Line Items] |  |  |  |
Limitation on payment of stock dividends |  |  | $ 3,800 |
Common stock dividends from Consumers |  |  | 254 |
Aggregate sales price of an equity offering program |  |  | 100 |
Consumers Energy Company [Member] |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |
Unrestricted retained earnings |  |  | 811 |
Consumers Energy Company [Member] | Commercial Paper [Member] |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |
Short-term debt, authorized borrowings |  | $ 500 |  |
Short-term borrowings outstanding |  |  | 0 |
Short Term Secured Borrowing Accounts Receivable Sales Program [Member] | Consumers Energy Company [Member] |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |
Amount of accounts receivable eligible for transfer |  |  | 250 |
Short-term borrowings outstanding |  |  | 0 |
Revolving Credit Facilities May 27, 2020 [Member] | CMS Energy [Member] |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |
Amount of Facility | [1] |  | 550 |
Revolving Credit Facilities May 27, 2020 [Member] | Consumers Energy Company [Member] |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |
Amount of Facility |  | $ 650 | $ 650 | [2]
[1] | During the six months ended June 30, 2015, CMS Energy's average borrowings totaled $61 million with a weighted-average interest rate of 1.43 percent. Obligations under this facility are secured by Consumers common stock.
[2] | Obligations under this facility are secured by FMBs of Consumers.

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