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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Securities held to maturity | $ 31 | $ 26
Liabilities |  |
EnerBank notes receivable, net of allowance for loan losses | 272 | 242
Long-term debt, current | 1,800 | 1,100
Other current liabilities | 6 | 1
Carrying Amount |  |
Assets |  |
Long-term receivables | 18 | 20
Notes receivable | 2,907 | 2,500
Securities held to maturity | 30 | 26
Liabilities |  |
Long-term debt | 15,054 | 13,062
Long-term payables | 31 | 30
Fair Value |  |
Assets |  |
Long-term receivables | 18 | 20
Notes receivable | 3,259 | 2,652
Securities held to maturity | 31 | 26
Liabilities |  |
Long-term debt | 17,104 | 14,185
Long-term payables | 33 | 32
Consumers Energy Company |  |
Liabilities |  |
Long-term debt, current | 537 | 202
Current portion notes receivable related party | 7 | 7
Consumers Energy Company | Carrying Amount |  |
Assets |  |
Long-term receivables | 18 | 20
Notes receivable related party | 108 | 103
Liabilities |  |
Long-term debt | 7,995 | 7,250
Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 18 | 20
Notes receivable related party | 108 | 103
Liabilities |  |
Long-term debt | 9,440 | 8,010
Other Receivables |  |
Liabilities |  |
Accounts receivable, current | 12 | 13
Other Receivables | Consumers Energy Company |  |
Liabilities |  |
Accounts receivable, current | 12 | 13
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 | 1,185 | 1,197
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 | 31 | 26
Liabilities |  |
Long-term debt | 13,992 | 11,048
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 | 7,513 | 6,070
Fair Value, Inputs, Level 3 | Fair Value |  |
Assets |  |
Long-term receivables | 18 | 20
Notes receivable | 3,259 | 2,652
Securities held to maturity | 0 | 0
Liabilities |  |
Long-term debt | 1,927 | 1,940
Long-term payables | 33 | 32
Fair Value, Inputs, Level 3 | Consumers Energy Company | Fair Value |  |
Assets |  |
Long-term receivables | 18 | 20
Notes receivable related party | 108 | 103
Liabilities |  |
Long-term debt | 1,927 | 1,940
EnerBank |  |
Liabilities |  |
EnerBank notes receivable, net of allowance for loan losses | $ 272 | $ 242

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