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Financings And Capitalization (Revolving Credit Facilities) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013
Revolving Credit Facilities December 21, 2017 [Member] | CMS Energy [Member] |  |
Expiration Date | Dec. 21, 2017 | [1]
Amount of Facility | $ 550 | [1]
Amount Borrowed |  | [1]
Letters of Credit Outstanding | 2 | [1]
Amount Available | 548 | [1]
Revolving Credit Facilities December 21, 2017 [Member] | Consumers Energy Company [Member] |  |
Expiration Date | Dec. 21, 2017 | [2]
Amount of Facility | 500 | [2]
Amount Borrowed |  | [2]
Letters of Credit Outstanding | 2 | [2]
Amount Available | 498 | [2]
Revolving Credit Facilities April 18, 2017 [Member] | Consumers Energy Company [Member] |  |
Expiration Date | Apr. 18, 2017 | [2]
Amount of Facility | 150 | [2]
Amount Borrowed |  | [2]
Amount Available | 150 | [2]
Revolving Credit Facilities September 9, 2014 [Member] | Consumers Energy Company [Member] |  |
Expiration Date | Sep. 09, 2014 | [2]
Amount of Facility | 30 | [2]
Amount Borrowed |  | [2]
Letters of Credit Outstanding | $ 30 | [2]
[1] | Obligations under this facility are secured by Consumers common stock.
[2] | Obligations under this facility are secured by FMBs of Consumers.

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant