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Financial Instruments (Tables) | 6 Months Ended
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Jun. 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 |
| June 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 |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |  |  |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |
Notes receivable 2 |  | 1,437 |  |  | 1,522 |  |  | — |  |  | — |  |  | 1,522 |  |  |  | 1,371 |  |  | 1,464 |  |  | — |  |  | — |  |  | 1,464 |
Securities held to maturity |  | 19 |  |  | 19 |  |  | — |  |  | 19 |  |  | — |  |  |  | 16 |  |  | 16 |  |  | — |  |  | 16 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 3 |  | 10,466 |  |  | 10,539 |  |  | 199 |  |  | 9,053 |  |  | 1,287 |  |  |  | 10,204 |  |  | 10,715 |  |  | — |  |  | 9,363 |  |  | 1,352 |
Long-term payables 4 |  | 26 |  |  | 26 |  |  | — |  |  | — |  |  | 26 |  |  |  | 27 |  |  | 26 |  |  | — |  |  | — |  |  | 26 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |  |  |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |
Notes receivable 5 |  | 17 |  |  | 17 |  |  | — |  |  | — |  |  | 17 |  |  |  | 17 |  |  | 17 |  |  | — |  |  | — |  |  | 17 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 6 |  | 6,114 |  |  | 6,163 |  |  | — |  |  | 4,876 |  |  | 1,287 |  |  |  | 5,904 |  |  | 6,236 |  |  | — |  |  | 4,883 |  |  | 1,353 |
1 | Includes current accounts receivable of $14 million at June 30, 2018 and December 31, 2017.
2 | Includes current portion of notes receivable of $206 million at June 30, 2018 and $200 million at December 31, 2017.
3 | Includes current portion of long-term debt of $1.2 billion at June 30, 2018 and $1.1 billion at December 31, 2017.
4 | Includes current portion of long-term payables of $3 million at June 30, 2018 and December 31, 2017.
5 | Includes current portion of notes receivable of $17 million at June 30, 2018 and December 31, 2017.
6 | Includes current portion of long-term debt of $376 million at June 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 |
| June 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 |  | $ | 135 |  |  | $ | — |  |  | $ | (2 | ) |  | $ | 133 |  |  |  | $ | 141 |  |  | $ | — |  |  | $ | — |  |  | $ | 141 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | 19 |  |  | — |  |  | — |  |  | 19 |  |  |  | 16 |  |  | — |  |  | — |  |  | 16 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | $ | 98 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 97 |  |  |  | $ | 102 |  |  | $ | — |  |  | $ | — |  |  | $ | 102 |
CMS Energy common stock 1 |  | — |  |  | — |  |  | — |  |  | — |  |  |  | 2 |  |  | 19 |  |  | — |  |  | 21 |
1 | In January 2018, Consumers implemented ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. In accordance with the standard, as of January 1, 2018, Consumers removed a $19 million unrealized gain on its investment in CMS Energy common stock from AOCI and recorded the gain in retained earnings. For further details on CMS Energy’s and Consumers’ accounting for this new standard, see Note 1, New Accounting Standards.
In January 2018, Consumers transferred substantially all of its shares in CMS Energy common stock to a related charitable foundation. Consumers’ remaining equity investment in CMS Energy common stock was $1 million at June 30, 2018. There were no material changes in the fair value of Consumers’ investment in CMS Energy common stock during the six months ended June 30, 2018.
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 |
| June 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 |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |  |  |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |
Notes receivable 2 |  | 1,437 |  |  | 1,522 |  |  | — |  |  | — |  |  | 1,522 |  |  |  | 1,371 |  |  | 1,464 |  |  | — |  |  | — |  |  | 1,464 |
Securities held to maturity |  | 19 |  |  | 19 |  |  | — |  |  | 19 |  |  | — |  |  |  | 16 |  |  | 16 |  |  | — |  |  | 16 |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 3 |  | 10,466 |  |  | 10,539 |  |  | 199 |  |  | 9,053 |  |  | 1,287 |  |  |  | 10,204 |  |  | 10,715 |  |  | — |  |  | 9,363 |  |  | 1,352 |
Long-term payables 4 |  | 26 |  |  | 26 |  |  | — |  |  | — |  |  | 26 |  |  |  | 27 |  |  | 26 |  |  | — |  |  | — |  |  | 26 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivables 1 |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |  |  |  | $ | 21 |  |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |
Notes receivable 5 |  | 17 |  |  | 17 |  |  | — |  |  | — |  |  | 17 |  |  |  | 17 |  |  | 17 |  |  | — |  |  | — |  |  | 17 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 6 |  | 6,114 |  |  | 6,163 |  |  | — |  |  | 4,876 |  |  | 1,287 |  |  |  | 5,904 |  |  | 6,236 |  |  | — |  |  | 4,883 |  |  | 1,353 |
1 | Includes current accounts receivable of $14 million at June 30, 2018 and December 31, 2017.
2 | Includes current portion of notes receivable of $206 million at June 30, 2018 and $200 million at December 31, 2017.
3 | Includes current portion of long-term debt of $1.2 billion at June 30, 2018 and $1.1 billion at December 31, 2017.
4 | Includes current portion of long-term payables of $3 million at June 30, 2018 and December 31, 2017.
5 | Includes current portion of notes receivable of $17 million at June 30, 2018 and December 31, 2017.
6 | Includes current portion of long-term debt of $376 million at June 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 |
| June 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 |  | $ | 135 |  |  | $ | — |  |  | $ | (2 | ) |  | $ | 133 |  |  |  | $ | 141 |  |  | $ | — |  |  | $ | — |  |  | $ | 141 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | 19 |  |  | — |  |  | — |  |  | 19 |  |  |  | 16 |  |  | — |  |  | — |  |  | 16 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  | $ | 98 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 97 |  |  |  | $ | 102 |  |  | $ | — |  |  | $ | — |  |  | $ | 102 |
CMS Energy common stock 1 |  | — |  |  | — |  |  | — |  |  | — |  |  |  | 2 |  |  | 19 |  |  | — |  |  | 21 |
1 | In January 2018, Consumers implemented ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. In accordance with the standard, as of January 1, 2018, Consumers removed a $19 million unrealized gain on its investment in CMS Energy common stock from AOCI and recorded the gain in retained earnings. For further details on CMS Energy’s and Consumers’ accounting for this new standard, see Note 1, New Accounting Standards.
In January 2018, Consumers transferred substantially all of its shares in CMS Energy common stock to a related charitable foundation. Consumers’ remaining equity investment in CMS Energy common stock was $1 million at June 30, 2018. There were no material changes in the fair value of Consumers’ investment in CMS Energy common stock during the six months ended June 30, 2018.

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