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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments | Presented in the following table are the carrying amounts and fair values, by level within the fair value hierarchy, of CMS Energy’s and Consumers’ financial instruments that are not recorded at fair value. The table excludes cash, cash equivalents, short‑term financial instruments, and trade accounts receivable and payable whose carrying amounts approximate their fair values. For information about assets and liabilities recorded at fair value and for additional details regarding the fair value hierarchy, see Note 5, Fair Value Measurements.
In Millions |
| March 31, 2019 |  | December 31, 2018
|  |  | Fair Value |  |  |  | Fair Value
| Carrying |  |  |  | Level |  | Carrying |  |  |  | Level
| Amount |  | Total |  | 1 |  | 2 |  | 3 |  |  | Amount |  | Total |  | 1 |  | 2 |  | 3 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long‑term receivables 1 |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |  |  |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |
Notes receivable 2 |  | 2,018 |  |  | 2,126 |  |  | — |  |  | — |  |  | 2,126 |  |  |  | 1,857 |  |  | 1,967 |  |  | — |  |  | — |  |  | 1,967 |
Securities held to maturity |  | 22 |  |  | 22 |  |  | — |  |  | 22 |  |  | — |  |  |  | 22 |  |  | 21 |  |  | — |  |  | 21 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 3 |  | 11,926 |  |  | 12,404 |  |  | 1,147 |  |  | 9,418 |  |  | 1,839 |  |  |  | 11,589 |  |  | 11,630 |  |  | 459 |  |  | 9,404 |  |  | 1,767 |
Long-term payables 4 |  | 27 |  |  | 28 |  |  | — |  |  | — |  |  | 28 |  |  |  | 27 |  |  | 27 |  |  | — |  |  | — |  |  | 27 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long‑term receivables 1 |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |  |  |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |
Notes receivable – related party 5 |  | 105 |  |  | 105 |  |  | — |  |  | — |  |  | 105 |  |  |  | 106 |  |  | 106 |  |  | — |  |  | — |  |  | 106 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long‑term debt 6 |  | 6,591 |  |  | 6,897 |  |  | — |  |  | 5,058 |  |  | 1,839 |  |  |  | 6,805 |  |  | 6,833 |  |  | — |  |  | 5,066 |  |  | 1,767 |
1 | Includes current accounts receivable of $13 million at March 31, 2019 and $14 million at December 31, 2018.
2 | Includes current portion of notes receivable of $250 million at March 31, 2019 and $233 million at December 31, 2018. For further details, see Note 7, Notes Receivable.
3 | Includes current portion of long‑term debt of $821 million at March 31, 2019 and $974 million at December 31, 2018.
4 | Includes current portion of long‑term payables of $2 million at March 31, 2019 and $1 million at December 31, 2018.
5 | Includes current portion of notes receivable – related party of $7 million at March 31, 2019 and December 31, 2018. For further details, see Note 7, Notes Receivable.
6 | Includes current portion of long‑term debt of $26 million at March 31, 2019 and December 31, 2018.
Schedule Of Investment Securities | Presented in the following table are these investment securities:
In Millions |
| March 31, 2019 |  | December 31, 2018
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  |  | Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |
CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |  |  |  | $ | 22 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 21 |
Consumers Energy Company |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments | Presented in the following table are the carrying amounts and fair values, by level within the fair value hierarchy, of CMS Energy’s and Consumers’ financial instruments that are not recorded at fair value. The table excludes cash, cash equivalents, short‑term financial instruments, and trade accounts receivable and payable whose carrying amounts approximate their fair values. For information about assets and liabilities recorded at fair value and for additional details regarding the fair value hierarchy, see Note 5, Fair Value Measurements.
In Millions |
| March 31, 2019 |  | December 31, 2018
|  |  | Fair Value |  |  |  | Fair Value
| Carrying |  |  |  | Level |  | Carrying |  |  |  | Level
| Amount |  | Total |  | 1 |  | 2 |  | 3 |  |  | Amount |  | Total |  | 1 |  | 2 |  | 3 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long‑term receivables 1 |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |  |  |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |
Notes receivable 2 |  | 2,018 |  |  | 2,126 |  |  | — |  |  | — |  |  | 2,126 |  |  |  | 1,857 |  |  | 1,967 |  |  | — |  |  | — |  |  | 1,967 |
Securities held to maturity |  | 22 |  |  | 22 |  |  | — |  |  | 22 |  |  | — |  |  |  | 22 |  |  | 21 |  |  | — |  |  | 21 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 3 |  | 11,926 |  |  | 12,404 |  |  | 1,147 |  |  | 9,418 |  |  | 1,839 |  |  |  | 11,589 |  |  | 11,630 |  |  | 459 |  |  | 9,404 |  |  | 1,767 |
Long-term payables 4 |  | 27 |  |  | 28 |  |  | — |  |  | — |  |  | 28 |  |  |  | 27 |  |  | 27 |  |  | — |  |  | — |  |  | 27 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long‑term receivables 1 |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |  |  |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |
Notes receivable – related party 5 |  | 105 |  |  | 105 |  |  | — |  |  | — |  |  | 105 |  |  |  | 106 |  |  | 106 |  |  | — |  |  | — |  |  | 106 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long‑term debt 6 |  | 6,591 |  |  | 6,897 |  |  | — |  |  | 5,058 |  |  | 1,839 |  |  |  | 6,805 |  |  | 6,833 |  |  | — |  |  | 5,066 |  |  | 1,767 |
1 | Includes current accounts receivable of $13 million at March 31, 2019 and $14 million at December 31, 2018.
2 | Includes current portion of notes receivable of $250 million at March 31, 2019 and $233 million at December 31, 2018. For further details, see Note 7, Notes Receivable.
3 | Includes current portion of long‑term debt of $821 million at March 31, 2019 and $974 million at December 31, 2018.
4 | Includes current portion of long‑term payables of $2 million at March 31, 2019 and $1 million at December 31, 2018.
5 | Includes current portion of notes receivable – related party of $7 million at March 31, 2019 and December 31, 2018. For further details, see Note 7, Notes Receivable.
6 | Includes current portion of long‑term debt of $26 million at March 31, 2019 and December 31, 2018.

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