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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2019
Financial Instruments [Line Items] |
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments | For information about assets and liabilities recorded at fair value and for additional details regarding the fair value hierarchy, see Note 6, Fair Value Measurements.
In Millions |
| December 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 |  | $ | 20 |  |  | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 20 |  |  |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |
Notes receivable 2 |  | 2,500 |  |  | 2,652 |  |  | — |  |  | — |  |  | 2,652 |  |  |  | 1,857 |  |  | 1,967 |  |  | — |  |  | — |  |  | 1,967 |
Securities held to maturity |  | 26 |  |  | 26 |  |  | — |  |  | 26 |  |  | — |  |  |  | 22 |  |  | 21 |  |  | — |  |  | 21 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 3 |  | 13,062 |  |  | 14,185 |  |  | 1,197 |  |  | 11,048 |  |  | 1,940 |  |  |  | 11,589 |  |  | 11,630 |  |  | 459 |  |  | 9,404 |  |  | 1,767 |
Long-term payables 4 |  | 30 |  |  | 32 |  |  | — |  |  | — |  |  | 32 |  |  |  | 27 |  |  | 27 |  |  | — |  |  | — |  |  | 27 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 20 |  |  | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 20 |  |  |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |
Notes receivable – related party 5 |  | 103 |  |  | 103 |  |  | — |  |  | — |  |  | 103 |  |  |  | 106 |  |  | 106 |  |  | — |  |  | — |  |  | 106 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 6 |  | 7,250 |  |  | 8,010 |  |  | — |  |  | 6,070 |  |  | 1,940 |  |  |  | 6,805 |  |  | 6,833 |  |  | — |  |  | 5,066 |  |  | 1,767 |
1 | Includes current portion of long-term accounts receivable of $13 million at December 31, 2019 and $14 million at December 31, 2018.
2 | Includes current portion of notes receivable of $242 million at December 31, 2019 and $233 million at December 31, 2018. For further details, see Note 8, Notes Receivable.
3 | Includes current portion of long-term debt of $1.1 billion at December 31, 2019 and $1.0 billion at December 31, 2018.
4 | Includes current portion of long-term payables of $1 million at December 31, 2019 and December 31, 2018.
5 | Includes current portion of notes receivable – related party of $7 million at December 31, 2019 and December 31, 2018. For further details on this note receivable, see the DB SERP discussion below.
6 Includes current portion of long-term debt of $202 million at December 31, 2019 and $26 million at December 31, 2018.
Schedule Of Sales Activity For Investment Securities | Presented in the following table is a summary of the sales activity for investment securities held within the DB SERP and classified as available for sale:
In Millions |
Years Ended December 31 | 2019 |  | 2018 |  | 2017 |
CMS Energy, including Consumers |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | — |  |  | $ | 142 |  |  | $ | 145 |
Consumers |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | — |  |  | $ | 103 |  |  | $ | 105 |
Schedule Of Investment Securities | Presented in the following table are these investment securities:
In Millions |
| December 31, 2019 |  | December 31, 2018
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  |  | Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |
CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | $ | 26 |  |  | $ | — |  |  | $ | — |  |  | $ | 26 |  |  |  | $ | 22 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 21 |
Consumers Energy Company |
Financial Instruments [Line Items] |
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments | For information about assets and liabilities recorded at fair value and for additional details regarding the fair value hierarchy, see Note 6, Fair Value Measurements.
In Millions |
| December 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 |  | $ | 20 |  |  | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 20 |  |  |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |
Notes receivable 2 |  | 2,500 |  |  | 2,652 |  |  | — |  |  | — |  |  | 2,652 |  |  |  | 1,857 |  |  | 1,967 |  |  | — |  |  | — |  |  | 1,967 |
Securities held to maturity |  | 26 |  |  | 26 |  |  | — |  |  | 26 |  |  | — |  |  |  | 22 |  |  | 21 |  |  | — |  |  | 21 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 3 |  | 13,062 |  |  | 14,185 |  |  | 1,197 |  |  | 11,048 |  |  | 1,940 |  |  |  | 11,589 |  |  | 11,630 |  |  | 459 |  |  | 9,404 |  |  | 1,767 |
Long-term payables 4 |  | 30 |  |  | 32 |  |  | — |  |  | — |  |  | 32 |  |  |  | 27 |  |  | 27 |  |  | — |  |  | — |  |  | 27 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 20 |  |  | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 20 |  |  |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |
Notes receivable – related party 5 |  | 103 |  |  | 103 |  |  | — |  |  | — |  |  | 103 |  |  |  | 106 |  |  | 106 |  |  | — |  |  | — |  |  | 106 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 6 |  | 7,250 |  |  | 8,010 |  |  | — |  |  | 6,070 |  |  | 1,940 |  |  |  | 6,805 |  |  | 6,833 |  |  | — |  |  | 5,066 |  |  | 1,767 |
1 | Includes current portion of long-term accounts receivable of $13 million at December 31, 2019 and $14 million at December 31, 2018.
2 | Includes current portion of notes receivable of $242 million at December 31, 2019 and $233 million at December 31, 2018. For further details, see Note 8, Notes Receivable.
3 | Includes current portion of long-term debt of $1.1 billion at December 31, 2019 and $1.0 billion at December 31, 2018.
4 | Includes current portion of long-term payables of $1 million at December 31, 2019 and December 31, 2018.
5 | Includes current portion of notes receivable – related party of $7 million at December 31, 2019 and December 31, 2018. For further details on this note receivable, see the DB SERP discussion below.
6 Includes current portion of long-term debt of $202 million at December 31, 2019 and $26 million at December 31, 2018.
Schedule Of Sales Activity For Investment Securities | Presented in the following table is a summary of the sales activity for investment securities held within the DB SERP and classified as available for sale:
In Millions |
Years Ended December 31 | 2019 |  | 2018 |  | 2017 |
CMS Energy, including Consumers |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | — |  |  | $ | 142 |  |  | $ | 145 |
Consumers |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | — |  |  | $ | 103 |  |  | $ | 105 |

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