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Plant, Property, and Equipment (Property, Plant and Equipment Table) (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2013 site | Dec. 31, 2013 site | Dec. 31, 2012 | Dec. 31, 2011
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Construction work in progress | $ 1,149 |  | $ 1,149 |  | $ 1,080 |  |
Accumulated Depreciation and Amortization | (5,087) |  | (5,087) |  | (5,121) |  |
Public Utilities, Property, Plant and Equipment, Net | 12,246 | [1] | 12,246 | [1] | 11,551 | [1] |
Public Utilities, Property Plant and Equipment Additions |  |  | 1,300 |  | 999 |  |
Public Utilities, Property Plant and Equipment Disposals |  |  | 156 |  | 168 |  |
Consumers Energy Company [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Capital Leased Assets, Gross | 291 |  | 291 |  | 285 |  | 280
Construction work in progress | 1,147 |  | 1,147 |  | 1,080 |  |
Accumulated Depreciation and Amortization | (5,022) |  | (5,022) |  | (5,061) |  |
Public Utilities, Property, Plant and Equipment, Net | 12,169 | [1] | 12,169 | [1] | 11,475 | [1] |
Public Utilities, Property Plant and Equipment Additions |  |  | 1,300 |  | 999 |  |
Public Utilities, Property Plant and Equipment Disposals |  |  | 156 |  | 168 |  |
Number of units planned to be retired | 10 |  | 10 |  |  |  |
Consumers Energy Company [Member] | Coal Fueled Electric Generating Units [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Number of units planned to be retired | 7 |  | 7 |  |  |  |
Consumers Energy Company [Member] | Gas Fueled Electric Generating Units [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Number of units planned to be retired | 3 |  | 3 |  |  |  |
Electricity Generation Plant, Non-Nuclear [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Generation or Processing | 3,992 |  | 3,992 |  | 4,254 |  |
Electricity Generation Plant, Non-Nuclear [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Generation |  |  | 22 years |  |  |  |
Electricity Generation Plant, Non-Nuclear [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Generation |  |  | 125 years |  |  |  |
Electricity Generation Plant, Non-Nuclear [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Generation or Processing | 3,992 |  | 3,992 |  | 4,254 |  |
Decrease of net plant, property, and equipment |  |  | 362 |  |  |  |
Electricity Generation Plant, Non-Nuclear [Member] | Consumers Energy Company [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Generation |  |  | 22 years |  |  |  |
Electricity Generation Plant, Non-Nuclear [Member] | Consumers Energy Company [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Generation |  |  | 125 years |  |  |  |
Electric Distribution [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Distribution | 6,140 |  | 6,140 |  | 5,831 |  |
Electric Distribution [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Distribution |  |  | 23 years |  |  |  |
Electric Distribution [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Distribution |  |  | 75 years |  |  |  |
Electric Distribution [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Distribution | 6,140 |  | 6,140 |  | 5,831 |  |
Electric Distribution [Member] | Consumers Energy Company [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Distribution |  |  | 23 years |  |  |  |
Electric Distribution [Member] | Consumers Energy Company [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Distribution |  |  | 75 years |  |  |  |
Electric Other [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 770 |  | 770 |  | 677 |  |
Electric Other [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 5 years |  |  |  |
Electric Other [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 50 years |  |  |  |
Electric Other [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 770 |  | 770 |  | 677 |  |
Electric Other [Member] | Consumers Energy Company [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 5 years |  |  |  |
Electric Other [Member] | Consumers Energy Company [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 50 years |  |  |  |
Electric Capital Leases [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Capital Leased Assets, Gross | 284 |  | 284 |  | 279 |  |
Electric Capital Leases [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Capital Leased Assets, Gross | 284 |  | 284 |  | 279 |  |
Gas Distribution [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Distribution | 3,015 |  | 3,015 |  | 2,861 |  |
Gas Distribution [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Distribution |  |  | 28 years |  |  |  |
Gas Distribution [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Distribution |  |  | 80 years |  |  |  |
Gas Distribution [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Distribution | 3,015 |  | 3,015 |  | 2,861 |  |
Gas Distribution [Member] | Consumers Energy Company [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Distribution |  |  | 28 years |  |  |  |
Gas Distribution [Member] | Consumers Energy Company [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Distribution |  |  | 80 years |  |  |  |
Gas Transmission [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Transmission | 821 |  | 821 |  | 770 |  |
Gas Transmission [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Transmission |  |  | 17 years |  |  |  |
Gas Transmission [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Transmission |  |  | 75 years |  |  |  |
Gas Transmission [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Transmission | 821 |  | 821 |  | 770 |  |
Gas Transmission [Member] | Consumers Energy Company [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Transmission |  |  | 17 years |  |  |  |
Gas Transmission [Member] | Consumers Energy Company [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Transmission |  |  | 75 years |  |  |  |
Gas Underground Storage Facilities [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 535 | [2] | 535 | [2] | 339 | [2] |
Gas Underground Storage Facilities [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 29 years | [2] |  |  |
Gas Underground Storage Facilities [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 65 years | [2] |  |  |
Gas Underground Storage Facilities [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 535 | [2] | 535 | [2] | 339 | [2] |
Gas Underground Storage Facilities [Member] | Consumers Energy Company [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 29 years | [2] |  |  |
Gas Underground Storage Facilities [Member] | Consumers Energy Company [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 65 years | [2] |  |  |
Gas Other [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 465 |  | 465 |  | 424 |  |
Gas Other [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 5 years |  |  |  |
Gas Other [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 50 years |  |  |  |
Gas Other [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 465 |  | 465 |  | 424 |  |
Gas Other [Member] | Consumers Energy Company [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 5 years |  |  |  |
Gas Other [Member] | Consumers Energy Company [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 50 years |  |  |  |
Gas Capital Leases [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Capital Leased Assets, Gross | 7 |  | 7 |  | 6 |  |
Gas Capital Leases [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Capital Leased Assets, Gross | 7 |  | 7 |  | 6 |  |
Enterprises IPP [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Plant, property, and equipment, gross | 89 |  | 89 |  | 89 |  |
Enterprises IPP [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 3 years |  |  |  |
Enterprises IPP [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 30 years |  |  |  |
Enterprises Other [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Plant, property, and equipment, gross | 26 |  | 26 |  | 24 |  |
Enterprises Other [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 3 years |  |  |  |
Enterprises Other [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 40 years |  |  |  |
Other [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Other non-utility property | 40 |  | 40 |  | 38 |  |
Other [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 1 year |  |  |  |
Other [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 51 years |  |  |  |
Other [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Other non-utility property | 15 |  | 15 |  | 15 |  |
Other [Member] | Consumers Energy Company [Member] | Minimum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 8 years |  |  |  |
Other [Member] | Consumers Energy Company [Member] | Maximum [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Estimated Depreciable Life in Years, Other |  |  | 51 years |  |  |  |
Base Natural Gas [Member] | Gas Underground Storage Facilities [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 26 |  | 26 |  | 26 |  |
Base Natural Gas [Member] | Gas Underground Storage Facilities [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | $ 26 |  | $ 26 |  | $ 26 |  |
[1] | For the year ended December 31, 2013, utility plant additions were $1.3 billion and utility plant retirements were $156 million. Subject to a successful Securitization transaction, Consumers plans to retire seven smaller coal-fueled electric generating units and three smaller gas-fueled electric generating units by April 2016. Accordingly, Consumers removed the net book value of the ten units from plant, property, and equipment and recorded this amount as a regulatory asset at December 31, 2013. As a result, net plant, property, and equipment decreased by $362 million. For additional details, see Note 2, Regulatory Matters.For the year ended December 31, 2012, utility plant additions were $999 million and utility plant retirements were $168 million.
[2] | Underground storage includes base natural gas of $26 million at December 31, 2013 and 2012. Base natural gas is not subject to depreciation.

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- Definition Period end book value of other property, plant and equipment (PPE) owned (but not classified elsewhere) by the public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Useful life of other property, plant and equipment (PPE) owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period end amount of property, plant and equipment (PPE) related to utility transmission owned by public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentTransmission
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Useful life of utility transmission equipment owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentTransmissionUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PublicUtilityPropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration