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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Consumers Energy Company [Member] | Sep. 30, 2013 Consumers Energy Company [Member] | Jun. 30, 2013 Consumers Energy Company [Member] | Mar. 31, 2013 Consumers Energy Company [Member] | Dec. 31, 2012 Consumers Energy Company [Member] | Sep. 30, 2012 Consumers Energy Company [Member] | Jun. 30, 2012 Consumers Energy Company [Member] | Mar. 31, 2012 Consumers Energy Company [Member] | Dec. 31, 2013 Consumers Energy Company [Member] | Dec. 31, 2012 Consumers Energy Company [Member] | Dec. 31, 2011 Consumers Energy Company [Member] | Dec. 31, 2013 Internal Revenue Service (IRS) [Member] | May 31, 2012 Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Uncertain tax benefits | $ 4 |  |  |  | $ 1 |  |  |  | $ 4 | $ 1 | $ 4 | $ 4 |  |  |  | $ 1 |  |  |  | $ 4 | $ 1 | $ 4 |  |
Net operating loss carryforward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45
Net income | $ 102 | $ 127 | $ 81 | $ 144 | $ 67 | $ 149 | $ 101 | $ 67 | $ 454 | $ 384 | $ 417 | $ 119 | $ 153 | $ 100 | $ 162 | $ 78 | $ 163 | $ 122 | $ 76 | $ 534 | $ 439 | $ 467 | $ (1) |

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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591551-111686 + Details
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