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Asset Sales, Discontinued Operations, And Impairment Charges (Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenues from Discontinued Operations |  |  |  |  |  |  | $ 10 |
Income (Loss) From Discontinued Operations, Before Income Tax, Total |  |  | 11 |  | 2 |  | (21) |
Tax Effect of Discontinued Operations |  |  | 4 |  |  |  | 2 |
Income (Loss) From Discontinued Operations, Net of Tax, Total | 7 | 2 | 7 | [1] | 2 | [2] | (23) | [3]
Allocated interest expense |  |  |  |  | 1 |  | 1 |
CMS Energy [Member] |  |  |  |  |  |  |  |
Income (Loss) From Discontinued Operations, Net of Tax, Total |  |  |  |  |  |  | (10) |
CMS Viron [Member] |  |  |  |  |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  |  |  | 3 |  |  |
Exeter [Member] |  |  |  |  |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax |  |  |  |  |  |  | 2 |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax |  |  |  |  |  |  | 1 |
Discontinued Operation, Provision for Loss (Gain) on Disposal, before Income Tax |  |  |  |  |  |  | 6 |
Discontinued Operation, Provision for Loss (Gain) on Disposal, Net of Tax |  |  |  |  |  |  | 4 |
2003 Asset Sale [Member] |  |  |  |  |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  |  |  |  |  | (10) |
2007 Asset Sale [Member] |  |  |  |  |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  |  |  |  |  | (3) |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, before Income Tax |  |  |  |  |  |  | (5) |
2002 Asset Sale [Member] |  |  |  |  |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax |  |  |  |  |  |  | (3) |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, before Income Tax |  |  |  |  |  |  | $ (5) |
[1] | Includes an $11 million ($7 million net of tax) reversal of a loss on disposal due to the elimination of a liability associated with the 2003 sale of Panhandle.
[2] | Includes an operating gain of $3 million related to a litigation settlement at CMS Viron.
[3] | Includes an operating loss of $2 million ($1 million net of tax) at Exeter, whose assets and liabilities were reclassified as held for sale in 2009.

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- Definition Pretax adjustment to an amount previously reported in discontinued operations that is directly related to the disposal of the component in a prior period. Examples of circumstances leading to such adjustments include the resolution of contingencies relating to the terms of the disposal transaction or relating to the operations of the component prior to its disposal, and the settlement of certain employee benefit plan obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 44 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1510-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1012-107759 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1020-107759 + Details
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- Definition Adjustment, net of tax, to an amount previously reported in discontinued operations that is directly related to the disposal of the component in a prior period. Examples of circumstances leading to such adjustments include the resolution of contingencies relating to the terms of the disposal transaction or relating to the operations of the component prior to its disposal, and the settlement of certain employee benefit plan obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 44 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1510-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1012-107759 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1020-107759 + Details
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