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Notes Receivable (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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EnerBank |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable | $ 2,231 | $ 1,857
Unearned income | 122 | 102
Delinquent loans | 24 | 21
Consumers Energy Company |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable | 105 | 106
Current portion notes receivable related party | 7 | $ 7
Retail Installment Contracts | EnerBank |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable | $ 238 |
CMS Energy Note Payable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Interest Rate | 4.10% |

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- Definition Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84165051&loc=d3e45377-112738 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534 + Details
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