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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other liabilities current |  | $ 159 | $ 142
Current portion of long-term debt |  | 984 | 684
DIG Note Payable [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other liabilities current |  | 1 | 1
Carrying Amount [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term receivable, fair Value | [1] | 23 |
Notes receivable, Fair Value | [2] | 1,286 | 1,161
Securities held to maturity - Fair Value |  | 13 | 11
Long-term debt, Fair Value | [3] | 9,706 | 9,084
Long-term payables, Fair Value | [4] | 22 | 14
Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term receivable, fair Value | [1] | 23 |
Notes receivable, Fair Value | [2] | 1,374 | 1,228
Securities held to maturity - Fair Value |  | 14 | 11
Long-term debt, Fair Value | [3] | 10,651 | 9,599
Long-term payables, Fair Value | [4] | 23 | 14
Consumers Energy Company [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other liabilities current |  | 127 | 109
Current portion of long-term debt |  | 275 | 198
Consumers Energy Company [Member] | Carrying Amount [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term receivable, fair Value |  | 23 |
Notes receivable, Fair Value |  | 45 |
Long-term debt, Fair Value | [5] | 5,640 | 5,381
Long-term payables, Fair Value |  | 6 |
Consumers Energy Company [Member] | Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term receivable, fair Value |  | 23 |
Notes receivable, Fair Value |  | 44 |
Long-term debt, Fair Value | [5] | 6,232 | 5,684
Long-term payables, Fair Value |  | 6 |
EnerBank [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Current notes receivable |  | 187 | 144
Other Receivables [Member] | Consumers Energy Company [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Accounts receivable, current |  | 13 |
Fair Value, Inputs, Level 1 [Member] | Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term receivable, fair Value | [1] |  |
Notes receivable, Fair Value | [2] |  |
Securities held to maturity - Fair Value |  |  |
Long-term debt, Fair Value | [3] |  |
Long-term payables, Fair Value | [4] |  |
Fair Value, Inputs, Level 1 [Member] | Consumers Energy Company [Member] | Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term receivable, fair Value |  |  |
Notes receivable, Fair Value |  |  |
Long-term debt, Fair Value | [5] |  |
Long-term payables, Fair Value |  |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities held to maturity - Fair Value |  | 14 | 11
Long-term debt, Fair Value | [3] | 9,628 | 8,648
Fair Value, Inputs, Level 2 [Member] | Consumers Energy Company [Member] | Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term debt, Fair Value | [5] | 5,209 | 4,733
Fair Value, Inputs, Level 3 [Member] | Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term receivable, fair Value | [1] | 23 |
Notes receivable, Fair Value | [2] | 1,374 | 1,228
Long-term debt, Fair Value | [3] | 1,023 | 951
Long-term payables, Fair Value | [4] | 23 | 14
Fair Value, Inputs, Level 3 [Member] | Consumers Energy Company [Member] | Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term receivable, fair Value |  | 23 |
Notes receivable, Fair Value |  | 44 |
Long-term debt, Fair Value | [5] | 1,023 | $ 951
Long-term payables, Fair Value |  | $ 6 |
[1] | Includes current accounts receivable of $13 million at September 30, 2016.
[2] | Includes current portion of notes receivable of $187 million at September 30, 2016 and $144 million at December 31, 2015.
[3] | Includes current portion of long-term debt of $984 million at September 30, 2016 and $684 million at December 31, 2015.
[4] | Includes current portion of long-term payables of $1 million at September 30, 2016 and December 31, 2015.
[5] | Includes current portion of long-term debt of $275 million at September 30, 2016 and $198 million at December 31, 2015.

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- Definition An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount includes amounts related to receivables held-for-sale. + References No definition available. + Details
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- Definition Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services. + 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(25)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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