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v3.20.2

Notes Receivable (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
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 | $ 137 | $ 134
Delinquent loans | 26 | $ 33
EnerBank | Retail Installment Contracts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable purchases | 20 |
Fair Value Hedging | Designated as Hedging Instrument | EnerBank | Interest Rate Swap Notes Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest rate swap | $ 134 |
Credit Concentration Risk | FICO Score, between Good and Excellent | EnerBank |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 86.00% |
Unfunded Loan Commitment | EnerBank |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Off-balance sheet unfunded loan commitments | $ 473 |
Allowance for expected credit loss on off balance sheet commitments | $ 9 |
Loans Originated Within Last Five Years | Credit Concentration Risk | EnerBank |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 97.00% |

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