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Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
EnerBank notes receivable, net of allowance for loan losses | $ 284 | $ 275
Total notes receivable | 2,710 | 2,887
Consumers Energy Company |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
DB SERP note receivable – related party | 7 | 7
DB SERP note receivable – related party | 99 | 100
Total notes receivable | 106 | 107
EnerBank |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
EnerBank notes receivable, net of allowance for loan losses | 284 | 275
EnerBank notes receivable, net of allowance for loan losses | $ 2,426 | $ 2,612

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