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Financings And Capitalization (Narrative) (Details) (USD $) |  | 3 Months Ended |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2014 CMS Energy [Member] | Mar. 31, 2014 Consumers Energy Company [Member] | Mar. 31, 2014 Short-Term Borrowings [Member] Consumers Energy Company [Member] | Mar. 31, 2014 Continuous Equity Program [Member] | Mar. 31, 2014 Senior Notes 5.5% Due June 2029 [Member]
Financing And Capitalization [Line Items] |  |  |  |  |  |
Amount of accounts receivable eligible for transfer |  |  |  | $ 250,000,000 |  |
Average short-term borrowings |  |  |  | 44,000,000 |  |
Weighted average annual interest rate |  |  |  | 0.85% |  |
Number of trading days, adjusted trigger price contingencies were met |  |  |  |  |  | 20 days
Number of trading days |  |  |  |  |  | 30 days
Limitation on payment of stock dividends | 3,600,000,000 |  |  |  |  |
Unrestricted retained earnings |  |  | 747,000,000 |  |  |
Common stock dividends from Consumers |  | 135,000,000 |  |  |  |
Aggregate sales price of an equity offering program |  |  |  |  | 50,000,000 |
Accounts receivable sales facility, remaining borrowing capacity |  |  |  | $ 250,000,000 |  |

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