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New Accounting Standards (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2014 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Unamortized debt issuance costs | $ 45 |  | $ 41
Cumulative effect of change in accounting principle | 33 |  |
Debt retirement premium payments | 18 | $ 36 |
New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Excess tax benefit related to stock | 7 |  |
Debt retirement premium payments |  | 36 |
Retained Earnings (Accumulated Deficit) [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of change in accounting principle | 33 |  |
CMS Energy [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt retirement premium payments | 18 | 20 |
Consumers Energy Company [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Unamortized debt issuance costs | 25 |  | $ 23
Debt retirement premium payments |  | 16 |
Consumers Energy Company [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Excess tax benefit related to stock | $ 7 |  |
Debt retirement premium payments |  | $ 16 |

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