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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Securities held to maturity | $ 25 | $ 21
Liabilities |  |
EnerBank notes receivable, net of allowance for loan losses | 234 | 233
Long-term debt, current | 1,100 | 1,000
Other current liabilities | 3 | 1
Carrying Amount |  |
Assets |  |
Long-term receivables | 21 | 22
Notes receivable | 2,464 | 1,857
Securities held to maturity | 24 | 22
Liabilities |  |
Long-term debt | 13,094 | 11,589
Long-term payables | 31 | 27
Fair Value |  |
Assets |  |
Long-term receivables | 21 | 22
Notes receivable | 2,619 | 1,967
Securities held to maturity | 25 | 21
Liabilities |  |
Long-term debt | 14,371 | 11,630
Long-term payables | 32 | 27
Consumers Energy Company |  |
Liabilities |  |
Long-term debt, current | 102 | 26
Current portion notes receivable related party | 7 | 7
Consumers Energy Company | Carrying Amount |  |
Assets |  |
Long-term receivables | 21 | 22
Notes receivable related party | 104 | 106
Liabilities |  |
Long-term debt | 7,189 | 6,805
Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 21 | 22
Notes receivable related party | 104 | 106
Liabilities |  |
Long-term debt | 8,035 | 6,833
EnerBank |  |
Liabilities |  |
EnerBank notes receivable, net of allowance for loan losses | 234 | 233
Other Receivables | Consumers Energy Company |  |
Liabilities |  |
Accounts receivable, current | 14 | 14
Fair Value, Inputs, Level 1 | Fair Value |  |
Assets |  |
Long-term receivables | 0 | 0
Notes receivable | 0 | 0
Securities held to maturity | 0 | 0
Liabilities |  |
Long-term debt | 1,245 | 459
Long-term payables | 0 | 0
Fair Value, Inputs, Level 1 | Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 0 | 0
Notes receivable related party | 0 | 0
Liabilities |  |
Long-term debt | 0 | 0
Fair Value, Inputs, Level 2 | Fair Value |  |
Assets |  |
Long-term receivables | 0 | 0
Notes receivable | 0 | 0
Securities held to maturity | 25 | 21
Liabilities |  |
Long-term debt | 11,163 | 9,404
Long-term payables | 0 | 0
Fair Value, Inputs, Level 2 | Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 0 | 0
Notes receivable related party | 0 | 0
Liabilities |  |
Long-term debt | 6,072 | 5,066
Fair Value, Inputs, Level 3 | Fair Value |  |
Assets |  |
Long-term receivables | 21 | 22
Notes receivable | 2,619 | 1,967
Securities held to maturity | 0 | 0
Liabilities |  |
Long-term debt | 1,963 | 1,767
Long-term payables | 32 | 27
Fair Value, Inputs, Level 3 | Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 21 | 22
Notes receivable related party | 104 | 106
Liabilities |  |
Long-term debt | $ 1,963 | $ 1,767

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