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Leases (Schedule of Future Minimum Lease Payments for Leases) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Capital Leases Future Minimum Payments Due Current | $ 14 |  |
Capital Leases Future Minimum Payments Due In Two Years | 13 |  |
Capital Leases Future Minimum Payments Due In Three Years | 14 |  |
Capital Leases Future Minimum Payments Due In Four Years | 10 |  |
Capital Leases Future Minimum Payments Due In Five Years | 9 |  |
Capital Leases Future Minimum Payments Due Thereafter | 36 |  |
Capital Leases, Future Minimum Payments Due, Total | 96 |  |
Capital Leases Future Minimum Payments Interest Included In Payments | 43 |  |
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Total | 53 |  |
Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments, Current Portion | 9 |  |
Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments NonCurrent Portion | 44 |  |
Finance Leases Future Minimum Payments Due Current | 20 |  |
Finance Leases Future Minimum Payments Due In Two Years | 19 |  |
Finance Leases Future Minimum Payments Due In Three Years | 18 |  |
Finance Leases Future Minimum Payments Due In Four Years | 17 |  |
Finance Leases Future Minimum Payments Due In Five Years | 17 |  |
Finance Leases Future Minimum Payments Due Thereafter | 62 |  |
Finance Leases Future Minimum Payments Due | 153 |  |
Finance Leases Future Minimum Payments Interest Included In Payments | 31 |  |
Finance Leases Future Minimum Payments Present Value Of Net Minimum Payments | 122 |  |
Finance Leases Future Minimum Payments Present Value Of Net Minimum Payments, Current Portion | 13 |  |
Finance Leases Future Minimum Payments Present Value Of Net Minimum Payments, Non Current Portion | 109 |  |
Operating Leases Future Minimum Payments Due Current | 26 |  |
Operating Leases Future Minimum Payments Due In Two Years | 25 |  |
Operating Leases Future Minimum Payments Due In Three Years | 24 |  |
Operating Leases Future Minimum Payments Due In Four Years | 19 |  |
Operating Leases Future Minimum Payments Due In Five Years | 19 |  |
Operating Leases Future Minimum Payments Due Thereafter | 67 |  |
Operating Leases, Future Minimum Payments Due, Total | 180 |  |
Finance Leases Lessee Balance Sheet Assets Amortization And Interest Charges | 20 | 21 | 22
Consumers Energy Company [Member] |  |  |
Capital Leases Future Minimum Payments Due Current | 14 |  |
Capital Leases Future Minimum Payments Due In Two Years | 13 |  |
Capital Leases Future Minimum Payments Due In Three Years | 14 |  |
Capital Leases Future Minimum Payments Due In Four Years | 10 |  |
Capital Leases Future Minimum Payments Due In Five Years | 9 |  |
Capital Leases Future Minimum Payments Due Thereafter | 36 |  |
Capital Leases, Future Minimum Payments Due, Total | 96 |  |
Capital Leases Future Minimum Payments Interest Included In Payments | 43 |  |
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Total | 53 |  |
Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments, Current Portion | 9 |  |
Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments NonCurrent Portion | 44 |  |
Finance Leases Future Minimum Payments Due Current | 20 |  |
Finance Leases Future Minimum Payments Due In Two Years | 19 |  |
Finance Leases Future Minimum Payments Due In Three Years | 18 |  |
Finance Leases Future Minimum Payments Due In Four Years | 17 |  |
Finance Leases Future Minimum Payments Due In Five Years | 17 |  |
Finance Leases Future Minimum Payments Due Thereafter | 62 |  |
Finance Leases Future Minimum Payments Due | 153 |  |
Finance Leases Future Minimum Payments Interest Included In Payments | 31 |  |
Finance Leases Future Minimum Payments Present Value Of Net Minimum Payments | 122 |  |
Finance Leases Future Minimum Payments Present Value Of Net Minimum Payments, Current Portion | 13 |  |
Finance Leases Future Minimum Payments Present Value Of Net Minimum Payments, Non Current Portion | 109 |  |
Operating Leases Future Minimum Payments Due Current | 26 |  |
Operating Leases Future Minimum Payments Due In Two Years | 25 |  |
Operating Leases Future Minimum Payments Due In Three Years | 24 |  |
Operating Leases Future Minimum Payments Due In Four Years | 19 |  |
Operating Leases Future Minimum Payments Due In Five Years | 19 |  |
Operating Leases Future Minimum Payments Due Thereafter | 67 |  |
Operating Leases, Future Minimum Payments Due, Total | 180 |  |
Finance Lease Term | 15 years |  |
Finance Leases Lessee Balance Sheet Assets Amortization And Interest Charges | $ 20 | $ 21 | $ 22

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- Definition Amount necessary to reduce net minimum lease payments to present value calculated at the lesser of the interest rate implicit in the lease (if known) or the entity's incremental borrowing rate (as defined) at inception of the lease. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph b(i) -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 Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 122 -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 FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph b(i) -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 Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 122 -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 FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph b(i) -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 Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 122 -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 FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph b(i) -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 Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 122 -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 FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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