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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2018
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿In Millions
﻿ | March 31, 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 receivables1 |  | $ | 20 |  | $ | 20 |  | $ | - |  | $ | - |  | $ | 20 |  |  | $ | 21 |  | $ | 21 |  | $ | - |  | $ | - |  | $ | 21 |
﻿Notes receivable2 |  |  | 1,370 |  |  | 1,453 |  |  | - |  |  | - |  |  | 1,453 |  |  |  | 1,371 |  |  | 1,464 |  |  | - |  |  | - |  |  | 1,464 |
﻿Securities held to maturity |  |  | 17 |  |  | 17 |  |  | - |  |  | 17 |  |  | - |  |  |  | 16 |  |  | 16 |  |  | - |  |  | 16 |  |  | - |
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term debt3 |  |  | 10,261 |  |  | 10,273 |  |  | - |  |  | 8,971 |  |  | 1,302 |  |  |  | 10,204 |  |  | 10,715 |  |  | - |  |  | 9,363 |  |  | 1,352 |
﻿Long-term payables4 |  |  | 25 |  |  | 26 |  |  | - |  |  | - |  |  | 26 |  |  |  | 27 |  |  | 26 |  |  | - |  |  | - |  |  | 26 |
﻿Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term receivables1 |  | $ | 20 |  | $ | 20 |  | $ | - |  | $ | - |  | $ | 20 |  |  | $ | 21 |  | $ | 21 |  | $ | - |  | $ | - |  | $ | 21 |
﻿Notes receivable5 |  |  | 17 |  |  | 17 |  |  | - |  |  | - |  |  | 17 |  |  |  | 17 |  |  | 17 |  |  | - |  |  | - |  |  | 17 |
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term debt6 |  |  | 5,904 |  |  | 6,034 |  |  | - |  |  | 4,732 |  |  | 1,302 |  |  |  | 5,904 |  |  | 6,236 |  |  | - |  |  | 4,883 |  |  | 1,353 |
﻿ 1 Includes current accounts receivable of $13 million at March 31, 2018 and $14 million at December 31, 2017. 2 Includes current portion of notes receivable of $203 million at March 31, 2018 and $200 million at December 31, 2017. 3 Includes current portion of long-term debt of $1.3 billion at March 31, 2018 and $ 1.1 billion at December 31, 2017. 4 Includes current portion of long-term payables of $2 million at March 31, 2018 and $3 million at December 31, 2017. 5 Includes current portion of notes receivable of $17 million at March 31, 2018 and $17 million at December 31, 2017. 6 Includes current portion of long-term debt of $693 million at March 31, 2018 and $343 million at December 31, 2017.
Schedule Of Investment Securities | ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿In Millions
﻿ | March 31, 2018 |  | December 31, 2017 |
﻿ |  | Unrealized | Unrealized | Fair |  |  | Unrealized | Unrealized | Fair |
﻿ | Cost | Gains | Losses | Value |  | Cost | Gains | Losses | Value |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Debt securities |  | $ | 139 |  | $ | - |  | $ | (2) |  | $ | 137 |  |  | $ | 141 |  | $ | - |  | $ | - |  | $ | 141 |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Debt securities |  |  | 17 |  |  | - |  |  | - |  |  | 17 |  |  |  | 16 |  |  | - |  |  | - |  |  | 16 |
﻿Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Debt securities |  | $ | 101 |  | $ | - |  | $ | (1) |  | $ | 100 |  |  | $ | 102 |  | $ | - |  | $ | - |  | $ | 102 |
﻿CMS Energy common stock1 |  |  | - |  |  | - |  |  | - |  |  | - |  |  |  | 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 March 31, 2018. There were no material changes in the fair value of Consumers’ investment in CMS Energy common stock during the three months ended March 31, 2018.
Consumers Energy Company [Member] |
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿In Millions
﻿ | March 31, 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 receivables1 |  | $ | 20 |  | $ | 20 |  | $ | - |  | $ | - |  | $ | 20 |  |  | $ | 21 |  | $ | 21 |  | $ | - |  | $ | - |  | $ | 21 |
﻿Notes receivable2 |  |  | 1,370 |  |  | 1,453 |  |  | - |  |  | - |  |  | 1,453 |  |  |  | 1,371 |  |  | 1,464 |  |  | - |  |  | - |  |  | 1,464 |
﻿Securities held to maturity |  |  | 17 |  |  | 17 |  |  | - |  |  | 17 |  |  | - |  |  |  | 16 |  |  | 16 |  |  | - |  |  | 16 |  |  | - |
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term debt3 |  |  | 10,261 |  |  | 10,273 |  |  | - |  |  | 8,971 |  |  | 1,302 |  |  |  | 10,204 |  |  | 10,715 |  |  | - |  |  | 9,363 |  |  | 1,352 |
﻿Long-term payables4 |  |  | 25 |  |  | 26 |  |  | - |  |  | - |  |  | 26 |  |  |  | 27 |  |  | 26 |  |  | - |  |  | - |  |  | 26 |
﻿Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term receivables1 |  | $ | 20 |  | $ | 20 |  | $ | - |  | $ | - |  | $ | 20 |  |  | $ | 21 |  | $ | 21 |  | $ | - |  | $ | - |  | $ | 21 |
﻿Notes receivable5 |  |  | 17 |  |  | 17 |  |  | - |  |  | - |  |  | 17 |  |  |  | 17 |  |  | 17 |  |  | - |  |  | - |  |  | 17 |
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term debt6 |  |  | 5,904 |  |  | 6,034 |  |  | - |  |  | 4,732 |  |  | 1,302 |  |  |  | 5,904 |  |  | 6,236 |  |  | - |  |  | 4,883 |  |  | 1,353 |
﻿ 1 Includes current accounts receivable of $13 million at March 31, 2018 and $14 million at December 31, 2017. 2 Includes current portion of notes receivable of $203 million at March 31, 2018 and $200 million at December 31, 2017. 3 Includes current portion of long-term debt of $1.3 billion at March 31, 2018 and $ 1.1 billion at December 31, 2017. 4 Includes current portion of long-term payables of $2 million at March 31, 2018 and $3 million at December 31, 2017. 5 Includes current portion of notes receivable of $17 million at March 31, 2018 and $17 million at December 31, 2017. 6 Includes current portion of long-term debt of $693 million at March 31, 2018 and $343 million at December 31, 2017.
Schedule Of Investment Securities | ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿In Millions
﻿ | March 31, 2018 |  | December 31, 2017 |
﻿ |  | Unrealized | Unrealized | Fair |  |  | Unrealized | Unrealized | Fair |
﻿ | Cost | Gains | Losses | Value |  | Cost | Gains | Losses | Value |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Debt securities |  | $ | 139 |  | $ | - |  | $ | (2) |  | $ | 137 |  |  | $ | 141 |  | $ | - |  | $ | - |  | $ | 141 |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Debt securities |  |  | 17 |  |  | - |  |  | - |  |  | 17 |  |  |  | 16 |  |  | - |  |  | - |  |  | 16 |
﻿Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Debt securities |  | $ | 101 |  | $ | - |  | $ | (1) |  | $ | 100 |  |  | $ | 102 |  | $ | - |  | $ | - |  | $ | 102 |
﻿CMS Energy common stock1 |  |  | - |  |  | - |  |  | - |  |  | - |  |  |  | 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 March 31, 2018. There were no material changes in the fair value of Consumers’ investment in CMS Energy common stock during the three months ended March 31, 2018.

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