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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |  |
Securities held to maturity |  | $ 19 | $ 16
Liabilities |  |  |
Long-term debt, current |  | 1,200 | 1,100
Other current liabilities |  | 117 | 195
Current portion of notes receivable |  | 206 | 198
DIG Note Payable |  |  |
Liabilities |  |  |
Other current liabilities |  | 3 | 3
Carrying Amount |  |  |
Assets |  |  |
Long-term receivables |  | 21 | 21
Notes receivable |  | 1,437 | 1,371
Securities held to maturity |  | 19 | 16
Liabilities |  |  |
Long-term debt | [1] | 10,466 | 10,204
Long-term payables | [2] | 26 | 27
Fair Value |  |  |
Assets |  |  |
Long-term receivables | [3] | 21 | 21
Notes receivable | [4] | 1,522 | 1,464
Securities held to maturity |  | 19 | 16
Liabilities |  |  |
Long-term debt | [1] | 10,539 | 10,715
Long-term payables | [2] | 26 | 26
Consumers Energy Company |  |  |
Liabilities |  |  |
Long-term debt, current |  | 376 | 343
Other current liabilities |  | 84 | 159
Current portion of notes receivable |  | 17 | 17
Consumers Energy Company | Carrying Amount |  |  |
Assets |  |  |
Long-term receivables | [3] | 21 | 21
Notes receivable |  | 17 | 17
Liabilities |  |  |
Long-term debt | [5] | 6,114 | 5,904
Consumers Energy Company | Fair Value |  |  |
Assets |  |  |
Long-term receivables | [3] | 21 | 21
Notes receivable | [6] | 17 | 17
Liabilities |  |  |
Long-term debt | [5] | 6,163 | 6,236
EnerBank |  |  |
Liabilities |  |  |
Current notes receivable |  | 206 | 200
Other Receivables | Consumers Energy Company |  |  |
Liabilities |  |  |
Accounts receivable, current |  | 14 | 14
Fair Value, Inputs, Level 1 | Fair Value |  |  |
Assets |  |  |
Long-term receivables | [3] | 0 | 0
Notes receivable | [4] | 0 | 0
Securities held to maturity |  | 0 | 0
Liabilities |  |  |
Long-term debt | [1] | 199 | 0
Long-term payables | [2] | 0 | 0
Fair Value, Inputs, Level 1 | Consumers Energy Company | Fair Value |  |  |
Assets |  |  |
Long-term receivables | [3] | 0 | 0
Notes receivable | [6] | 0 | 0
Liabilities |  |  |
Long-term debt | [5] | 0 | 0
Fair Value, Inputs, Level 2 | Fair Value |  |  |
Assets |  |  |
Long-term receivables | [3] | 0 | 0
Notes receivable | [4] | 0 | 0
Securities held to maturity |  | 19 | 16
Liabilities |  |  |
Long-term debt | [1] | 9,053 | 9,363
Long-term payables | [2] | 0 | 0
Fair Value, Inputs, Level 2 | Consumers Energy Company | Fair Value |  |  |
Assets |  |  |
Long-term receivables | [3] | 0 | 0
Notes receivable | [6] | 0 | 0
Liabilities |  |  |
Long-term debt | [5] | 4,876 | 4,883
Fair Value, Inputs, Level 3 | Fair Value |  |  |
Assets |  |  |
Long-term receivables | [3] | 21 | 21
Notes receivable | [4] | 1,522 | 1,464
Securities held to maturity |  | 0 | 0
Liabilities |  |  |
Long-term debt | [1] | 1,287 | 1,352
Long-term payables | [2] | 26 | 26
Fair Value, Inputs, Level 3 | Consumers Energy Company | Fair Value |  |  |
Assets |  |  |
Long-term receivables | [3] | 21 | 21
Notes receivable | [6] | 17 | 17
Liabilities |  |  |
Long-term debt | [5] | 1,287 | 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 portion of long-term debt of $1.2 billion at June 30, 2018 and $1.1 billion at December 31, 2017.
[2] | Includes current portion of long-term payables of $3 million at June 30, 2018 and December 31, 2017.
[3] | Includes current accounts receivable of $14 million at June 30, 2018 and December 31, 2017.
[4] | Includes current portion of notes receivable of $206 million at June 30, 2018 and $200 million at December 31, 2017.
[5] | Includes current portion of long-term debt of $376 million at June 30, 2018 and $343 million at December 31, 2017.
[6] | Includes current portion of notes receivable of $17 million at June 30, 2018 and December 31, 2017.

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