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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2017
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿In Millions
﻿ | March 31, 2017 |  | December 31, 2016 |
﻿ |  | 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 |  | $ | 18 |  | $ | 18 |  | $ | - |  | $ | - |  | $ | 18 |  |  | $ | 22 |  | $ | 22 |  | $ | - |  | $ | - |  | $ | 22 |
﻿Notes receivable 2 |  |  | 1,288 |  |  | 1,373 |  |  | - |  |  | - |  |  | 1,373 |  |  |  | 1,326 |  |  | 1,415 |  |  | - |  |  | - |  |  | 1,415 |
﻿Securities held to maturity |  |  | 12 |  |  | 12 |  |  | - |  |  | 12 |  |  | - |  |  |  | 13 |  |  | 13 |  |  | - |  |  | 13 |  |  | - |
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term debt 3 |  |  | 9,919 |  |  | 10,345 |  |  | - |  |  | 9,367 |  |  | 978 |  |  |  | 9,504 |  |  | 9,953 |  |  | - |  |  | 8,990 |  |  | 963 |
﻿Long-term payables 4 |  |  | 18 |  |  | 18 |  |  | - |  |  | - |  |  | 18 |  |  |  | 17 |  |  | 17 |  |  | - |  |  | - |  |  | 17 |
﻿Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term receivables 1 |  | $ | 18 |  | $ | 18 |  | $ | - |  | $ | - |  | $ | 18 |  |  | $ | 22 |  | $ | 22 |  | $ | - |  | $ | - |  | $ | 22 |
﻿Notes receivable 5 |  |  | 45 |  |  | 45 |  |  | - |  |  | - |  |  | 45 |  |  |  | 45 |  |  | 45 |  |  | - |  |  | - |  |  | 45 |
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term debt 6 |  |  | 5,724 |  |  | 5,999 |  |  | - |  |  | 5,021 |  |  | 978 |  |  |  | 5,628 |  |  | 5,903 |  |  | - |  |  | 4,940 |  |  | 963 |
﻿
| 1 |  | Includes current accounts receivable of $12 million at March 31, 2017 and December 31, 2016.
﻿
| 2 |  | Includes current portion of notes receivable of $205 million at March 31, 2017 and $219 million at December 31, 2016.
﻿
| 3 |  | Includes current portion of long-term debt of $790 million at March 31, 2017 and $864 million at December 31, 2016.
﻿
| 4 |  | Includes current portion of long-term payables of $1 million at March 31, 2017 and December 31, 2016.
﻿
| 5 |  | Includes current portion of notes receivable of $29 million at March 31, 2017 and December 31, 2016.
﻿
| 6 |  | Includes current portion of long-term debt of $305 million at March 31, 2017 and $375 million at December 31, 2016.
﻿
Schedule Of Investment Securities |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿In Millions
﻿ | March 31, 2017 |  | December 31, 2016 |
﻿ |  | Unrealized | Unrealized | Fair |  |  | Unrealized | Unrealized | Fair |
﻿ | Cost | Gains | Losses | Value |  | Cost | Gains | Losses | Value |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Mutual funds |  | $ | 142 |  | $ | 1 |  | $ | - |  | $ | 143 |  |  | $ | 141 |  | $ | - |  | $ | - |  | $ | 141 |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Debt securities |  |  | 12 |  |  | - |  |  | - |  |  | 12 |  |  |  | 13 |  |  | - |  |  | - |  |  | 13 |
﻿Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Mutual funds |  | $ | 102 |  | $ | - |  | $ | - |  | $ | 102 |  |  | $ | 102 |  | $ | - |  | $ | - |  | $ | 102 |
﻿CMS Energy common stock |  |  | 2 |  |  | 18 |  |  | - |  |  | 20 |  |  |  | 4 |  |  | 29 |  |  | - |  |  | 33 |
﻿
Consumers Energy Company [Member] |
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿In Millions
﻿ | March 31, 2017 |  | December 31, 2016 |
﻿ |  | 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 |  | $ | 18 |  | $ | 18 |  | $ | - |  | $ | - |  | $ | 18 |  |  | $ | 22 |  | $ | 22 |  | $ | - |  | $ | - |  | $ | 22 |
﻿Notes receivable 2 |  |  | 1,288 |  |  | 1,373 |  |  | - |  |  | - |  |  | 1,373 |  |  |  | 1,326 |  |  | 1,415 |  |  | - |  |  | - |  |  | 1,415 |
﻿Securities held to maturity |  |  | 12 |  |  | 12 |  |  | - |  |  | 12 |  |  | - |  |  |  | 13 |  |  | 13 |  |  | - |  |  | 13 |  |  | - |
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term debt 3 |  |  | 9,919 |  |  | 10,345 |  |  | - |  |  | 9,367 |  |  | 978 |  |  |  | 9,504 |  |  | 9,953 |  |  | - |  |  | 8,990 |  |  | 963 |
﻿Long-term payables 4 |  |  | 18 |  |  | 18 |  |  | - |  |  | - |  |  | 18 |  |  |  | 17 |  |  | 17 |  |  | - |  |  | - |  |  | 17 |
﻿Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term receivables 1 |  | $ | 18 |  | $ | 18 |  | $ | - |  | $ | - |  | $ | 18 |  |  | $ | 22 |  | $ | 22 |  | $ | - |  | $ | - |  | $ | 22 |
﻿Notes receivable 5 |  |  | 45 |  |  | 45 |  |  | - |  |  | - |  |  | 45 |  |  |  | 45 |  |  | 45 |  |  | - |  |  | - |  |  | 45 |
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term debt 6 |  |  | 5,724 |  |  | 5,999 |  |  | - |  |  | 5,021 |  |  | 978 |  |  |  | 5,628 |  |  | 5,903 |  |  | - |  |  | 4,940 |  |  | 963 |
﻿
| 1 |  | Includes current accounts receivable of $12 million at March 31, 2017 and December 31, 2016.
﻿
| 2 |  | Includes current portion of notes receivable of $205 million at March 31, 2017 and $219 million at December 31, 2016.
﻿
| 3 |  | Includes current portion of long-term debt of $790 million at March 31, 2017 and $864 million at December 31, 2016.
﻿
| 4 |  | Includes current portion of long-term payables of $1 million at March 31, 2017 and December 31, 2016.
﻿
| 5 |  | Includes current portion of notes receivable of $29 million at March 31, 2017 and December 31, 2016.
﻿
| 6 |  | Includes current portion of long-term debt of $305 million at March 31, 2017 and $375 million at December 31, 2016.
﻿
Schedule Of Investment Securities |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿In Millions
﻿ | March 31, 2017 |  | December 31, 2016 |
﻿ |  | Unrealized | Unrealized | Fair |  |  | Unrealized | Unrealized | Fair |
﻿ | Cost | Gains | Losses | Value |  | Cost | Gains | Losses | Value |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Mutual funds |  | $ | 142 |  | $ | 1 |  | $ | - |  | $ | 143 |  |  | $ | 141 |  | $ | - |  | $ | - |  | $ | 141 |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Debt securities |  |  | 12 |  |  | - |  |  | - |  |  | 12 |  |  |  | 13 |  |  | - |  |  | - |  |  | 13 |
﻿Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Mutual funds |  | $ | 102 |  | $ | - |  | $ | - |  | $ | 102 |  |  | $ | 102 |  | $ | - |  | $ | - |  | $ | 102 |
﻿CMS Energy common stock |  |  | 2 |  |  | 18 |  |  | - |  |  | 20 |  |  |  | 4 |  |  | 29 |  |  | - |  |  | 33 |
﻿

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