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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |  |  |
Securities held to maturity |  | $ 21 | $ 16 |
Liabilities |  |  |  |
Other current liabilities |  | 134 | 195 |
Long-term debt, current |  | 1,900 | 1,100 |
Current portion of notes receivable |  | 237 | 198 |
DIG Note Payable |  |  |  |
Liabilities |  |  |  |
Other current liabilities |  | 3 | 3 |
Carrying Amount |  |  |  |
Assets |  |  |  |
Long-term receivables |  | 22 | 21 | [1]
Notes receivable | [2] | 1,640 | 1,371 |
Securities held to maturity |  | 22 | 16 |
Liabilities |  |  |  |
Long-term debt | [3] | 10,817 | 10,204 |
Long-term payables | [4] | 26 | 27 |
Fair Value |  |  |  |
Assets |  |  |  |
Long-term receivables | [1] | 22 | 21 |
Notes receivable | [2] | 1,730 | 1,464 |
Securities held to maturity |  | 21 | 16 |
Liabilities |  |  |  |
Long-term debt | [3] | 10,798 | 10,715 |
Long-term payables | [4] | 26 | 26 |
Consumers Energy Company |  |  |  |
Liabilities |  |  |  |
Other current liabilities |  | 96 | 159 |
Long-term debt, current |  | 876 | 343 |
Current portion of notes receivable |  | 17 | 17 |
Current portion notes receivable related party |  | 7 | 0 |
Consumers Energy Company | Carrying Amount |  |  |  |
Assets |  |  |  |
Long-term receivables | [1] | 22 | 21 |
Notes receivable | [5] | 17 | 17 |
Notes Receivable Affiliate, Fair Value Disclosure | [6] | 107 | 0 |
Liabilities |  |  |  |
Long-term debt | [7] | 6,115 | 5,904 |
Consumers Energy Company | Fair Value |  |  |  |
Assets |  |  |  |
Long-term receivables | [1] | 22 | 21 |
Notes receivable | [5] | 17 | 17 |
Notes Receivable Affiliate, Fair Value Disclosure | [6] | 105 | 0 |
Liabilities |  |  |  |
Long-term debt | [7] | 6,083 | 6,236 |
EnerBank |  |  |  |
Liabilities |  |  |  |
Current notes receivable |  | 263 | 200 |
Other Receivables | Consumers Energy Company |  |  |  |
Liabilities |  |  |  |
Accounts receivable, current |  | 15 | 14 |
Fair Value, Inputs, Level 1 | Fair Value |  |  |  |
Assets |  |  |  |
Long-term receivables | [1] | 0 | 0 |
Notes receivable | [2] | 0 | 0 |
Securities held to maturity |  | 0 | 0 |
Liabilities |  |  |  |
Long-term debt | [3] | 445 | 0 |
Long-term payables | [4] | 0 | 0 |
Fair Value, Inputs, Level 1 | Consumers Energy Company | Fair Value |  |  |  |
Assets |  |  |  |
Long-term receivables | [1] | 0 | 0 |
Notes receivable | [5] | 0 | 0 |
Notes Receivable Affiliate, Fair Value Disclosure | [6] | 0 | 0 |
Liabilities |  |  |  |
Long-term debt | [7] | 0 | 0 |
Fair Value, Inputs, Level 2 | Fair Value |  |  |  |
Assets |  |  |  |
Long-term receivables | [1] | 0 | 0 |
Notes receivable | [2] | 0 | 0 |
Securities held to maturity |  | 21 | 16 |
Liabilities |  |  |  |
Long-term debt | [3] | 9,088 | 9,363 |
Long-term payables | [4] | 0 | 0 |
Fair Value, Inputs, Level 2 | Consumers Energy Company | Fair Value |  |  |  |
Assets |  |  |  |
Long-term receivables | [1] | 0 | 0 |
Notes receivable | [5] | 0 | 0 |
Notes Receivable Affiliate, Fair Value Disclosure | [6] | 0 | 0 |
Liabilities |  |  |  |
Long-term debt | [7] | 4,818 | 4,883 |
Fair Value, Inputs, Level 3 | Fair Value |  |  |  |
Assets |  |  |  |
Long-term receivables | [1] | 22 | 21 |
Notes receivable | [2] | 1,730 | 1,464 |
Securities held to maturity |  | 0 | 0 |
Liabilities |  |  |  |
Long-term debt | [3] | 1,265 | 1,352 |
Long-term payables | [4] | 26 | 26 |
Fair Value, Inputs, Level 3 | Consumers Energy Company | Fair Value |  |  |  |
Assets |  |  |  |
Long-term receivables | [1] | 22 | 21 |
Notes receivable | [5] | 17 | 17 |
Notes Receivable Affiliate, Fair Value Disclosure | [6] | 105 | 0 |
Liabilities |  |  |  |
Long-term debt | [7] | 1,265 | 1,353 |
Michigan tax settlement |  |  |  |
Liabilities |  |  |  |
Current portion of notes receivable |  | 20 | 20 |
Michigan tax settlement | Consumers Energy Company |  |  |  |
Liabilities |  |  |  |
Current portion of notes receivable |  | $ 17 | $ 17 |
[1] | Includes current accounts receivable of $15 million at September 30, 2018 and $14 million December 31, 2017.
[2] | Includes current portion of notes receivable of $263 million at September 30, 2018 and $200 million at December 31, 2017. For further details, see Note 7, Notes Receivable.
[3] | Includes current portion of long-term debt of $1.9 billion at September 30, 2018 and $1.1 billion at December 31, 2017.
[4] | Includes current portion of long-term payables of $3 million at September 30, 2018 and December 31, 2017.
[5] | Includes current portion of notes receivable of $17 million at September 30, 2018 and December 31, 2017.
[6] | Includes current portion of notes receivable – related party of $7 million at September 30, 2018. For further details on this note receivable, see the DB SERP discussion below.
[7] | Includes current portion of long-term debt of $876 million at September 30, 2018 and $343 million at December 31, 2017.

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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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