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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, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Construction work in progress | $ 783 |  | $ 570 |  |
Accumulated Depreciation and Amortization | 4,901 |  | 4,646 |  |
Public Utilities, Property, Plant and Equipment, Net | 10,633 | [1] | 10,069 | [1] |
Public Utilities, Property Plant and Equipment Additions | 700 |  | 783 |  |
Public Utilities, Property Plant and Equipment Disposals | 104 |  | 85 |  |
Consumers Energy Company [Member] |  |  |  |  |
Capital Leased Assets, Gross | 280 |  | 278 |  | 306
Construction work in progress | 782 |  | 566 |  |
Accumulated Depreciation and Amortization | 4,846 |  | 4,593 |  |
Public Utilities, Property, Plant and Equipment, Net | 10,557 | [1] | 9,995 | [1] |
Public Utilities, Property Plant and Equipment Additions | 700 |  | 783 |  |
Public Utilities, Property Plant and Equipment Disposals | 104 |  | 85 |  |
Electricity Generation Plant, Non-Nuclear [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 18 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 85 |  |  |  |
Public Utilities, Property, Plant and Equipment, Generation or Processing | 3,936 |  | 3,812 |  |
Electricity Generation Plant, Non-Nuclear [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 18 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 85 |  |  |  |
Public Utilities, Property, Plant and Equipment, Generation or Processing | 3,936 |  | 3,812 |  |
Electric Distribution [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 12 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 75 |  |  |  |
Public Utilities, Property, Plant and Equipment, Distribution | 5,538 |  | 5,250 |  |
Electric Distribution [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 12 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 75 |  |  |  |
Public Utilities, Property, Plant and Equipment, Distribution | 5,538 |  | 5,250 |  |
Electric Other [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 7 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 40 |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 651 |  | 609 |  |
Electric Other [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 7 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 40 |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 651 |  | 609 |  |
Electric Capital Leases [Member] |  |  |  |  |
Capital Leased Assets, Gross | 275 |  | 273 |  |
Electric Capital Leases [Member] | Consumers Energy Company [Member] |  |  |  |  |
Capital Leased Assets, Gross | 275 |  | 273 |  |
Gas Underground Storage Facilities [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 30 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 65 |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 322 | [2] | 311 | [2] |
Gas Underground Storage Facilities [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 30 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 65 |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 322 | [2] | 311 | [2] |
Gas Transmission [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 13 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 75 |  |  |  |
Public Utilities, Property, Plant and Equipment, Transmission | 722 |  | 713 |  |
Gas Transmission [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 13 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 75 |  |  |  |
Public Utilities, Property, Plant and Equipment, Transmission | 722 |  | 713 |  |
Gas Distribution [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 30 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 80 |  |  |  |
Public Utilities, Property, Plant and Equipment, Distribution | 2,754 |  | 2,654 |  |
Gas Distribution [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 30 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 80 |  |  |  |
Public Utilities, Property, Plant and Equipment, Distribution | 2,754 |  | 2,654 |  |
Gas Other [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 5 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 50 |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 403 |  | 380 |  |
Gas Other [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 5 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 50 |  |  |  |
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment | 403 |  | 380 |  |
Gas Capital Leases [Member] |  |  |  |  |
Capital Leased Assets, Gross | 5 |  | 5 |  |
Gas Capital Leases [Member] | Consumers Energy Company [Member] |  |  |  |  |
Capital Leased Assets, Gross | 5 |  | 5 |  |
Enterprises IPP [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 3 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 30 |  |  |  |
Plant, Property, and Equipment, at cost | 89 |  | 85 |  |
Plant, Property, and Equipment, Gross | 89 |  | 85 |  |
Enterprises Other [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 3 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 40 |  |  |  |
Plant, Property, and Equipment, at cost | 20 |  | 17 |  |
Plant, Property, and Equipment, Gross | 20 |  | 17 |  |
Other [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 1 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 51 |  |  |  |
Public Utilities, Property Plant and Equipment, Gross | 36 |  | 36 |  |
Other [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 8 |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Maximum | 51 |  |  |  |
Unregulated Operation [Member] | Consumers Energy Company [Member] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Useful Life, Minimum | 1 |  |  |  |
Other non-utility property | 15 |  | 15 |  |
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, 2011, utility plant additions were $700 million and utility plant retirements were $104 million. For the year ended December 31, 2010, utility plant additions were $783 million and utility plant retirements were $85 million.
[2] | Underground storage includes base natural gas of $26 million at December 31, 2011 and 2010. Base natural gas is not subject to depreciation.

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