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Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2018
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 |
| September 30, 2018 |  | December 31, 2017
|  |  | 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 |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |  |  |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |
Notes receivable 2 |  | 1,640 |  |  | 1,730 |  |  | — |  |  | — |  |  | 1,730 |  |  |  | 1,371 |  |  | 1,464 |  |  | — |  |  | — |  |  | 1,464 |
Securities held to maturity |  | 22 |  |  | 21 |  |  | — |  |  | 21 |  |  | — |  |  |  | 16 |  |  | 16 |  |  | — |  |  | 16 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term payables 3 |  | 26 |  |  | 26 |  |  | — |  |  | — |  |  | 26 |  |  |  | 27 |  |  | 26 |  |  | — |  |  | — |  |  | 26 |
Long-term debt 4 |  | 10,817 |  |  | 10,798 |  |  | 445 |  |  | 9,088 |  |  | 1,265 |  |  |  | 10,204 |  |  | 10,715 |  |  | — |  |  | 9,363 |  |  | 1,352 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |  |  |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |
Notes receivable 5 |  | 17 |  |  | 17 |  |  | — |  |  | — |  |  | 17 |  |  |  | 17 |  |  | 17 |  |  | — |  |  | — |  |  | 17 |
Notes receivable – related party 6 |  | 107 |  |  | 105 |  |  | — |  |  | — |  |  | 105 |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 7 |  | 6,115 |  |  | 6,083 |  |  | — |  |  | 4,818 |  |  | 1,265 |  |  |  | 5,904 |  |  | 6,236 |  |  | — |  |  | 4,883 |  |  | 1,353 |
1 | Includes current accounts receivable of $15 million at September 30, 2018 and $14 million December 31, 2017.
2 | Includes current portion of notes receivable of $263 million at September 30, 2018 and $200 million at December 31, 2017. For further details, see Note 7, Notes Receivable.
3 | Includes current portion of long-term payables of $3 million at September 30, 2018 and December 31, 2017.
4 | Includes current portion of long-term debt of $1.9 billion at September 30, 2018 and $1.1 billion at December 31, 2017.
5 | Includes current portion of notes receivable of $17 million at September 30, 2018 and December 31, 2017.
6 | Includes current portion of notes receivable – related party of $7 million at September 30, 2018. For further details on this note receivable, see the DB SERP discussion below.
7 | Includes current portion of long-term debt of $876 million at September 30, 2018 and $343 million at December 31, 2017.
Schedule Of Investment Securities | Presented in the following table are CMS Energy’s and Consumers’ investment securities classified as available for sale or held to maturity:
In Millions |
| September 30, 2018 |  | December 31, 2017
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  |  | Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |  | $ | 141 |  |  | $ | — |  |  | $ | — |  |  | $ | 141 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | 22 |  |  | — |  |  | (1 | ) |  | 21 |  |  |  | 16 |  |  | — |  |  | — |  |  | 16 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |  | $ | 102 |  |  | $ | — |  |  | $ | — |  |  | $ | 102 |
CMS Energy common stock |  | — |  |  | — |  |  | — |  |  | — |  |  |  | 2 |  |  | 19 |  |  | — |  |  | 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 |
| September 30, 2018 |  | December 31, 2017
|  |  | 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 |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |  |  |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |
Notes receivable 2 |  | 1,640 |  |  | 1,730 |  |  | — |  |  | — |  |  | 1,730 |  |  |  | 1,371 |  |  | 1,464 |  |  | — |  |  | — |  |  | 1,464 |
Securities held to maturity |  | 22 |  |  | 21 |  |  | — |  |  | 21 |  |  | — |  |  |  | 16 |  |  | 16 |  |  | — |  |  | 16 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term payables 3 |  | 26 |  |  | 26 |  |  | — |  |  | — |  |  | 26 |  |  |  | 27 |  |  | 26 |  |  | — |  |  | — |  |  | 26 |
Long-term debt 4 |  | 10,817 |  |  | 10,798 |  |  | 445 |  |  | 9,088 |  |  | 1,265 |  |  |  | 10,204 |  |  | 10,715 |  |  | — |  |  | 9,363 |  |  | 1,352 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 22 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |  |  |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |
Notes receivable 5 |  | 17 |  |  | 17 |  |  | — |  |  | — |  |  | 17 |  |  |  | 17 |  |  | 17 |  |  | — |  |  | — |  |  | 17 |
Notes receivable – related party 6 |  | 107 |  |  | 105 |  |  | — |  |  | — |  |  | 105 |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 7 |  | 6,115 |  |  | 6,083 |  |  | — |  |  | 4,818 |  |  | 1,265 |  |  |  | 5,904 |  |  | 6,236 |  |  | — |  |  | 4,883 |  |  | 1,353 |
1 | Includes current accounts receivable of $15 million at September 30, 2018 and $14 million December 31, 2017.
2 | Includes current portion of notes receivable of $263 million at September 30, 2018 and $200 million at December 31, 2017. For further details, see Note 7, Notes Receivable.
3 | Includes current portion of long-term payables of $3 million at September 30, 2018 and December 31, 2017.
4 | Includes current portion of long-term debt of $1.9 billion at September 30, 2018 and $1.1 billion at December 31, 2017.
5 | Includes current portion of notes receivable of $17 million at September 30, 2018 and December 31, 2017.
6 | Includes current portion of notes receivable – related party of $7 million at September 30, 2018. For further details on this note receivable, see the DB SERP discussion below.
7 | Includes current portion of long-term debt of $876 million at September 30, 2018 and $343 million at December 31, 2017.
Schedule Of Investment Securities | Presented in the following table are CMS Energy’s and Consumers’ investment securities classified as available for sale or held to maturity:
In Millions |
| September 30, 2018 |  | December 31, 2017
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  |  | Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |  | $ | 141 |  |  | $ | — |  |  | $ | — |  |  | $ | 141 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | 22 |  |  | — |  |  | (1 | ) |  | 21 |  |  |  | 16 |  |  | — |  |  | — |  |  | 16 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |  | $ | 102 |  |  | $ | — |  |  | $ | — |  |  | $ | 102 |
CMS Energy common stock |  | — |  |  | — |  |  | — |  |  | — |  |  |  | 2 |  |  | 19 |  |  | — |  |  | 21 |

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