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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Notes and accrued interest receivable |  | $ 186 | $ 180
Other liabilities current |  | 135 | 199
Current portion of long-term debt |  | 790 | 864
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] | 18 | 22
Notes receivable, Fair Value | [2] | 1,288 | 1,326
Securities held to maturity - Fair Value |  | 12 | 13
Long-term debt, Fair Value | [3] | 9,919 | 9,504
Long-term payables, Fair Value | [4] | 18 | 17
Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term receivable, fair Value | [1] | 18 | 22
Notes receivable, Fair Value | [2] | 1,373 | 1,415
Securities held to maturity - Fair Value |  | 12 | 13
Long-term debt, Fair Value | [3] | 10,345 | 9,953
Long-term payables, Fair Value | [4] | 18 | 17
Consumers Energy Company [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Notes and accrued interest receivable |  | 29 | 29
Other liabilities current |  | 99 | 164
Current portion of long-term debt |  | 305 | 375
Consumers Energy Company [Member] | Carrying Amount [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term receivable, fair Value | [1] | 18 | 22
Notes receivable, Fair Value | [5] | 45 | 45
Long-term debt, Fair Value | [6] | 5,724 | 5,628
Consumers Energy Company [Member] | Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term receivable, fair Value | [1] | 18 | 22
Notes receivable, Fair Value | [5] | 45 | 45
Long-term debt, Fair Value | [6] | 5,999 | 5,903
EnerBank [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Current notes receivable |  | 205 | 219
Other Receivables [Member] | Consumers Energy Company [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Accounts receivable, current |  | 12 | 12
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 | [1] |  |
Notes receivable, Fair Value | [5] |  |
Long-term debt, Fair Value | [6] |  |
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 |  | 12 | 13
Long-term debt, Fair Value | [3] | 9,367 | 8,990
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 | [6] | 5,021 | 4,940
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] | 18 | 22
Notes receivable, Fair Value | [2] | 1,373 | 1,415
Long-term debt, Fair Value | [3] | 978 | 963
Long-term payables, Fair Value | [4] | 18 | 17
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 | [1] | 18 | 22
Notes receivable, Fair Value | [5] | 45 | 45
Long-term debt, Fair Value | [6] | $ 978 | $ 963
[1] | Includes current accounts receivable of $12 million at March 31, 2017 and December 31, 2016.
[2] | Includes current portion of notes receivable of $205 million at March 31, 2017 and $219 million at December 31, 2016.
[3] | Includes current portion of long-term debt of $790 million at March 31, 2017 and $864 million at December 31, 2016.
[4] | Includes current portion of long-term payables of $1 million at March 31, 2017 and December 31, 2016.
[5] | Includes current portion of notes receivable of $29 million at March 31, 2017 and December 31, 2016.
[6] | Includes current portion of long-term debt of $305 million at March 31, 2017 and $375 million at December 31, 2016.

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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 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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