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Plant, Property, and Equipment (Schedule of Finite-Lived Intangible Assets by Major Class Table) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross | $ 909 | [1] | $ 855 | [1]
Finite-Lived Intangible Assets, Accumulated Amortization | 280 |  | 269 |
Public Utilities, Property Plant and Equipment Additions | 1,300 |  | 999 |
Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross | 906 | [1] | 853 | [1]
Finite-Lived Intangible Assets, Accumulated Amortization | 279 |  | 269 |
Public Utilities, Property Plant and Equipment Additions | 1,300 |  | 999 |
Software and Software Development Costs [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Computer Software, Gross | 508 | [1] | 466 | [1]
Finite-Lived Intangible Assets, Accumulated Amortization | 174 |  | 172 |
Software and Software Development Costs [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Computer Software, Gross | 506 | [1] | 464 | [1]
Finite-Lived Intangible Assets, Accumulated Amortization | 173 |  | 172 |
Plant Acquisition Adjustments [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Public Utilities, Property, Plant and Equipment, Plant Adjustments for Intangible Utility Plants | 216 | [1] | 214 | [1]
Finite-Lived Intangible Assets, Accumulated Amortization | 32 |  | 27 |
Plant Acquisition Adjustments [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Public Utilities, Property, Plant and Equipment, Plant Adjustments for Intangible Utility Plants | 216 | [1] | 214 | [1]
Finite-Lived Intangible Assets, Accumulated Amortization | 32 |  | 27 |
Leasehold Improvements [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Leasehold Improvements, Gross | 14 | [1] | 13 | [1]
Finite-Lived Intangible Assets, Accumulated Amortization | 11 |  | 10 |
Leasehold Improvements [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Leasehold Improvements, Gross | 14 | [1] | 13 | [1]
Finite-Lived Intangible Assets, Accumulated Amortization | 11 |  | 10 |
Intangible Plant [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Public Utilities, Property Plant and Equipment Additions | 53 |  | 108 |
Rights of Way [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Contractual Rights, Gross | 135 | [1] | 130 | [1]
Finite-Lived Intangible Assets, Accumulated Amortization | 42 |  | 40 |
Rights of Way [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Contractual Rights, Gross | 135 | [1] | 130 | [1]
Finite-Lived Intangible Assets, Accumulated Amortization | 42 |  | 40 |
Franchises and Consents [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross | 15 | [1] | 14 | [1]
Finite-Lived Intangible Assets, Accumulated Amortization | 7 |  | 6 |
Franchises and Consents [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Gross | 15 | [1] | 14 | [1]
Finite-Lived Intangible Assets, Accumulated Amortization | 7 |  | 6 |
Other Intangibles [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Other Finite-Lived Intangible Assets, Gross | 21 | [1] | 18 | [1]
Finite-Lived Intangible Assets, Accumulated Amortization | 14 |  | 14 |
Other Intangibles [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Other Finite-Lived Intangible Assets, Gross | 20 | [1] | 18 | [1]
Finite-Lived Intangible Assets, Accumulated Amortization | $ 14 |  | $ 14 |
Minimum [Member] | Software and Software Development Costs [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |  |
Minimum [Member] | Software and Software Development Costs [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |  |
Minimum [Member] | Plant Acquisition Adjustments [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 40 years |  |  |
Minimum [Member] | Plant Acquisition Adjustments [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 40 years |  |  |
Minimum [Member] | Rights of Way [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 50 years |  |  |
Minimum [Member] | Rights of Way [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 50 years |  |  |
Minimum [Member] | Franchises and Consents [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |  |
Minimum [Member] | Franchises and Consents [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |  |
Maximum [Member] | Software and Software Development Costs [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |  |
Maximum [Member] | Software and Software Development Costs [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |  |
Maximum [Member] | Plant Acquisition Adjustments [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 46 years |  |  |
Maximum [Member] | Plant Acquisition Adjustments [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 46 years |  |  |
Maximum [Member] | Rights of Way [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 75 years |  |  |
Maximum [Member] | Rights of Way [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 75 years |  |  |
Maximum [Member] | Franchises and Consents [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 30 years |  |  |
Maximum [Member] | Franchises and Consents [Member] | Consumers Energy Company [Member] |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 30 years |  |  |
[1] | Net intangible asset additions for Consumers’ utility plant were $53 million during 2013 and $108 million during 2012 and primarily represented software development costs.

X
- Definition Current year acquisitions of long-lived assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, certain intangible assets, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References No definition available. + Details
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- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition Any changes made to the basis costs of intangible utility plants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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