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Plant, Property, and Equipment (Property, Plant and Equipment Table) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Construction work in progress | $ 1,080 |  | $ 783 |  |
Accumulated Depreciation and Amortization | (5,121) |  | (4,901) |  |
Public Utilities, Property, Plant and Equipment, Net | 11,551 | [1] | 10,633 | [1] |
Public Utilities, Property Plant and Equipment Additions | 999 |  | 700 |  |
Public Utilities, Property Plant and Equipment Disposals | 168 |  | 104 |  |
Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 8 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 51 years |  |  |  |
Capital Leased Assets, Gross | 285 |  | 280 |  | 278
Other non-utility property | 15 |  | 15 |  |
Construction work in progress | 1,080 |  | 782 |  |
Accumulated Depreciation and Amortization | (5,061) |  | (4,846) |  |
Public Utilities, Property, Plant and Equipment, Net | 11,475 | [1] | 10,557 | [1] |
Public Utilities, Property Plant and Equipment Additions | 999 |  | 700 |  |
Public Utilities, Property Plant and Equipment Disposals | 168 |  | 104 |  |
Electricity Generation Plant, Non-Nuclear [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 22 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 125 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Generation or Processing | 4,254 |  | 3,936 |  |
Electricity Generation Plant, Non-Nuclear [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 22 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 125 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Generation or Processing | 4,254 |  | 3,936 |  |
Electric Distribution [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 23 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 75 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Distribution | 5,831 |  | 5,538 |  |
Electric Distribution [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 23 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 75 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Distribution | 5,831 |  | 5,538 |  |
Electric Other [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 5 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 50 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 677 |  | 651 |  |
Electric Other [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 5 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 50 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 677 |  | 651 |  |
Electric Capital Leases [Member] |  |  |  |  |
Capital Leased Assets, Gross | 279 |  | 275 |  |
Electric Capital Leases [Member] | Consumers Energy Company [Member] |  |  |  |  |
Capital Leased Assets, Gross | 279 |  | 275 |  |
Gas Distribution [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 30 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 80 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Distribution | 2,861 |  | 2,754 |  |
Gas Distribution [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 30 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 80 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Distribution | 2,861 |  | 2,754 |  |
Gas Transmission [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 13 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 75 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Transmission | 770 |  | 722 |  |
Gas Transmission [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 13 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 75 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Transmission | 770 |  | 722 |  |
Gas Underground Storage Facilities [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 30 years | [2] |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 65 years | [2] |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 339 | [2] | 322 | [2] |
Gas Underground Storage Facilities [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 30 years | [2] |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 65 years | [2] |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 339 | [2] | 322 | [2] |
Gas Other [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 5 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 50 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 424 |  | 403 |  |
Gas Other [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 5 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 50 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 424 |  | 403 |  |
Gas Capital Leases [Member] |  |  |  |  |
Capital Leased Assets, Gross | 6 |  | 5 |  |
Gas Capital Leases [Member] | Consumers Energy Company [Member] |  |  |  |  |
Capital Leased Assets, Gross | 6 |  | 5 |  |
Enterprises IPP [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 3 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 30 years |  |  |  |
Plant, property, and equipment, gross | 89 |  | 89 |  |
Enterprises Other [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 3 years |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 40 years |  |  |  |
Plant, property, and equipment, gross | 24 |  | 20 |  |
Other [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 1 year |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 51 years |  |  |  |
Other non-utility property | 38 |  | 36 |  |
Base Natural Gas [Member] | Gas Underground Storage Facilities [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 26 |  | 26 |  |
Base Natural Gas [Member] | Gas Underground Storage Facilities [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | $ 26 |  | $ 26 |  |
[1] | For the year ended December 31, 2012, utility plant additions were $999 million and utility plant retirements were $168 million. For the year ended December 31, 2011, utility plant additions were $700 million and utility plant retirements were $104 million.
[2] | Underground storage includes base natural gas of $26 million at December 31, 2012 and 2011. Base natural gas is not subject to depreciation.

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- Definition The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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