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Notes Receivable (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
CMS Energy Note Payable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest rate |  |  | 4.10%
EnerBank |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unearned income | $ 128 | $ 134 |
Sale of notes receivable | 246 |  |
Gain on sale of notes receivable | 6 |  |
Delinquent loans | 32 | $ 33 |
EnerBank | Unfunded Loan Commitment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unfunded loan commitments | 348 |  |
Allowance for expected credit loss on off balance sheet commitments | $ 6 |  |
EnerBank | Credit Concentration Risk | Loans Originated Within Last Five Years |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Concentration risk, percentage | 97.00% |  |
EnerBank | Credit Concentration Risk | FICO Score, Between Good And Excellent |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Concentration risk, percentage | 86.00% |  |
EnerBank | Retail Installment Contracts |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Consumer retail installment contracts | $ 90 |  |
EnerBank | Interest Rate Swap, Notes Receivable | Fair Value Hedging | Designated as Hedging Instrument |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Notional amount | $ 134 |  |

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