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Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
EnerBank notes receivable, net of allowance for loan losses | $ 275 | $ 242
Total notes receivable | 2,887 | 2,500
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 | 100 | 96
Total notes receivable | 107 | 103
EnerBank |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
EnerBank notes receivable, net of allowance for loan losses | 275 | 242
EnerBank notes receivable, net of allowance for loan losses | $ 2,612 | $ 2,258

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