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Financings And Capitalization (Revolving Credit Facilities) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2015 | Dec. 31, 2015
Revolving Credit Facilities May 27, 2020 [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Expiration Date | [1] |  | May 27, 2020 |
Amount of Facility | [1] |  | $ 550 |
Amount Borrowed | [1] |  |  |
Letters of Credit Outstanding | [1] |  | $ 1 |
Amount Available | [1] |  | $ 549 |
Revolving Credit Facilities May 27, 2020 [Member] | Consumers Energy Company [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Expiration Date | [2] |  | May 27, 2020 |
Amount of Facility | [2] |  | $ 650 |
Amount Borrowed | [2] |  |  |
Letters of Credit Outstanding | [2] |  | $ 9 |
Amount Available | [2] |  | $ 641 |
Revolving Credit Facilities November 23, 2017 [Member] | Consumers Energy Company [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Expiration Date | [2],[3] |  | Nov. 23, 2017 |
Amount of Facility |  | $ 250 | $ 250 | [2],[3]
Amount Borrowed | [2],[3] |  |  |
Amount Available | [2],[3] |  | $ 250 |
Revolving Credit Facilities May 9, 2018 [Member] | Consumers Energy Company [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Expiration Date | [2] |  | May 09, 2018 |
Amount of Facility | [2] |  | $ 30 |
Amount Borrowed | [2] |  |  |
Letters of Credit Outstanding | [2] |  | $ 30 |
Short Term Secured Borrowing Accounts Receivable Sales Program [Member] | Consumers Energy Company [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Short term borrowings, program terminated |  | $ 250 |  |
[1] | Obligations under this facility are secured by Consumers common stock
[2] | Obligations under this facility are secured by FMBs of Consumers.In November 2015, Consumers entered into a new $250 million credit facility and terminated its $250 million accounts receivable sales program.
[3] | In November 2015, Consumers entered into a new $250 million credit facility and terminated its $250 million accounts receivable sales program.

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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
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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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 + Details
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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 + Details
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Balance Type: | credit
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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 + Details
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