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New Accounting Standards	12 Months Ended
New Accounting Standards	Dec. 31, 2014
New Accounting Standards	2:New Accounting Standards New Accounting Standards Not Yet Effective ASU 2014‑09, Revenue from Contracts with Customers: This standard was issued by the Financial Accounting Standards Board as a result of a joint project with the International Accounting Standards Board. The Boards developed a common revenue recognition model that will be applied under GAAP and International Financial Reporting Standards. The new guidance will replace most of the existing revenue recognition requirements in GAAP, although certain guidance specific to rate-regulated utilities will be retained. As issued, the standard will become effective January 1, 2017 for CMS Energy and Consumers; however, the Financial Accounting Standards Board is considering a possible delay in the effective date. CMS Energy and Consumers are evaluating the impact of the standard on their consolidated financial statements. ASU 2014‑12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period: This standard, which will become effective January 1, 2016 for CMS Energy and Consumers, addresses certain types of stock awards with performance targets. The standard will apply to certain restricted stock awards granted by CMS Energy and Consumers to retirement-eligible employees. CMS Energy and Consumers do not expect the standard to have any impact on their consolidated financial statements since the guidance in the standard is consistent with the accounting presently applied to these awards.
Consumers Energy Company [Member]
New Accounting Standards	2:New Accounting Standards New Accounting Standards Not Yet Effective ASU 2014‑09, Revenue from Contracts with Customers: This standard was issued by the Financial Accounting Standards Board as a result of a joint project with the International Accounting Standards Board. The Boards developed a common revenue recognition model that will be applied under GAAP and International Financial Reporting Standards. The new guidance will replace most of the existing revenue recognition requirements in GAAP, although certain guidance specific to rate-regulated utilities will be retained. As issued, the standard will become effective January 1, 2017 for CMS Energy and Consumers; however, the Financial Accounting Standards Board is considering a possible delay in the effective date. CMS Energy and Consumers are evaluating the impact of the standard on their consolidated financial statements. ASU 2014‑12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period: This standard, which will become effective January 1, 2016 for CMS Energy and Consumers, addresses certain types of stock awards with performance targets. The standard will apply to certain restricted stock awards granted by CMS Energy and Consumers to retirement-eligible employees. CMS Energy and Consumers do not expect the standard to have any impact on their consolidated financial statements since the guidance in the standard is consistent with the accounting presently applied to these awards.