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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Securities held to maturity | $ 21 | $ 16
Liabilities |  |
Current accounts receivable | 14 | 14
Notes receivable current including held for sale |  | 200
Current notes receivable | 233 | 198
Current amounts | 974 | 1,081
Other current liabilities | 147 | 195
Long-term Service Agreement Payable |  |
Liabilities |  |
Other current liabilities | 1 | 3
Carrying Amount |  |
Assets |  |
Long-term receivables | 22 | 21
Notes receivable | 1,857 | 1,371
Securities held to maturity | 22 | 16
Liabilities |  |
Long-term debt | 11,589 | 10,204
Long-term payables | 27 | 27
Fair Value |  |
Assets |  |
Long-term receivables | 22 | 21
Notes receivable | 1,967 | 1,464
Securities held to maturity | 21 | 16
Liabilities |  |
Long-term debt | 11,630 | 10,715
Long-term payables | 27 | 26
Consumers Energy Company |  |
Liabilities |  |
Current notes receivable | 0 | 17
DB SERP note receivable – related party | 7 | 0
Current amounts | 26 | 343
Other current liabilities | 120 | 159
Consumers Energy Company | Carrying Amount |  |
Assets |  |
Long-term receivables | 22 | 21
Notes receivable | 0 | 17
Notes receivable related party | 106 |
Liabilities |  |
Long-term debt | 6,805 | 5,904
Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 22 | 21
Notes receivable | 0 | 17
Notes receivable related party | 106 |
Liabilities |  |
Long-term debt | 6,833 | 6,236
Level 1 | Fair Value |  |
Liabilities |  |
Long-term debt | 459 |
Level 2 | Fair Value |  |
Assets |  |
Securities held to maturity | 21 | 16
Liabilities |  |
Long-term debt | 9,404 | 9,363
Level 2 | Consumers Energy Company | Fair Value |  |
Assets |  |
Notes receivable related party | 0 |
Liabilities |  |
Long-term debt | 5,066 | 4,883
Level 3 | Fair Value |  |
Assets |  |
Long-term receivables | 22 | 21
Notes receivable | 1,967 | 1,464
Liabilities |  |
Long-term debt | 1,767 | 1,352
Long-term payables | 27 | 26
Level 3 | Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 22 | 21
Notes receivable | 0 | 17
Notes receivable related party | 106 |
Liabilities |  |
Long-term debt | 1,767 | 1,353
EnerBank notes receivable, net of allowance for loan losses | EnerBank |  |
Liabilities |  |
Notes receivable current including held for sale | 233 |
Current notes receivable | 233 | 178
Michigan tax settlement |  |
Liabilities |  |
Current notes receivable | 0 | 20
Michigan tax settlement | Consumers Energy Company |  |
Liabilities |  |
Current notes receivable | $ 0 | $ 17

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