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Financings And Capitalization (Narrative) (Details) (USD $) |  | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 18 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2014 CMS Energy [Member] | Jun. 30, 2014 Consumers Energy Company [Member] | Sep. 30, 2014 Consumers Energy Company [Member] | Sep. 30, 2014 Consumers Energy Company [Member] Commercial Paper [Member] | Sep. 30, 2014 Short Term Secured Borrowing Accounts Receivable Sales Program [Member] Consumers Energy Company [Member] | Sep. 30, 2014 Continuous Equity Program [Member] | Sep. 30, 2014 Revolving Credit Facilities December 20, 2018 [Member] CMS Energy [Member] | Sep. 30, 2014 Revolving Credit Facilities December 20, 2018 [Member] Consumers Energy Company [Member]
Financing And Capitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum allowed short term securities outstanding under FERC Authorization |  |  | $ 800,000,000 |  |  |  |  |  |  |  |
Amount of accounts receivable eligible for transfer |  |  |  |  |  | 250,000,000 |  |  |  |  |
Average short-term borrowings |  |  |  |  |  | 15,000,000 |  |  |  |  |
Weighted average annual interest rate |  |  |  |  |  | 0.85% |  |  |  |  |
Amount of Facility |  |  |  |  |  |  |  | 550,000,000 | [1] | 650,000,000 | [2]
Short-term debt, authorized borrowings |  |  |  |  | 500,000,000 |  |  |  |  |  |
Short-term borrowings outstanding |  |  |  |  | 0 |  |  |  |  |  |
Limitation on payment of stock dividends | 3,700,000,000 |  |  |  |  |  |  |  |  |  |
Unrestricted retained earnings |  |  |  | 735,000,000 |  |  |  |  |  |  |
Common stock dividends from Consumers |  | 375,000,000 |  |  |  |  |  |  |  |  |
Aggregate sales price of an equity offering program |  |  |  |  |  |  | 50,000,000 |  |  |  |
Accounts receivable sales facility, remaining borrowing capacity |  |  |  |  |  | 250,000,000 |  | 548,000,000 | [1] | 650,000,000 | [2]
Maximum limitation on outstanding securities |  |  | $ 1,900,000,000 |  |  |  |  |  |  |  |
Expiration date of authorizations |  |  |  | June 30, 2016 |  |  |  |  |  |  |
[1] | 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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