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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2016
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
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﻿In Millions
﻿ | December 31, 2016 |  | December 31, 2015 |
﻿ |  | 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 |  |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | - |
﻿Notes receivable 2 |  |  | 1,326 |  |  | 1,415 |  |  | - |  |  | - |  |  | 1,415 |  |  |  | 1,161 |  |  | 1,228 |  |  | - |  |  | - |  |  | 1,228 |
﻿Securities held to maturity |  |  | 13 |  |  | 13 |  |  | - |  |  | 13 |  |  | - |  |  |  | 11 |  |  | 11 |  |  | - |  |  | 11 |  |  | - |
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term debt 3 |  |  | 9,504 |  |  | 9,953 |  |  | - |  |  | 8,990 |  |  | 963 |  |  |  | 9,084 |  |  | 9,599 |  |  | - |  |  | 8,648 |  |  | 951 |
﻿Long-term payables 4 |  |  | 17 |  |  | 17 |  |  | - |  |  | - |  |  | 17 |  |  |  | 14 |  |  | 14 |  |  | - |  |  | - |  |  | 14 |
﻿Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term receivables 1 |  | $ | 22 |  | $ | 22 |  | $ | - |  | $ | - |  | $ | 22 |  |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | - |
﻿Notes receivable 5 |  |  | 45 |  |  | 45 |  |  | - |  |  | - |  |  | 45 |  |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term debt 6 |  |  | 5,628 |  |  | 5,903 |  |  | - |  |  | 4,940 |  |  | 963 |  |  |  | 5,381 |  |  | 5,684 |  |  | - |  |  | 4,733 |  |  | 951 |
﻿
| 1 |  | Includes current accounts receivable of $12 million at December 31, 2016.
| 2 |  | Includes current portion of notes receivable of $219 million at December 31, 2016 and $144 million at December 31, 2015.
| 3 |  | Includes current portion of long-term debt of $864 million at December 31, 2016 and $684 million at December 31, 2015.
| 4 |  | Includes current portion of long-term payables of $1 million at December 31, 2016 and 2015.
| 5 |  | Includes current portion of notes receivable of $29 million at Decemb er 31, 2 016.
| 6 |  | Includes current portion of long-term debt of $375 million at December 31, 2016 and $198 million at December 31, 2015.
Schedule Of Investment Securities |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿In Millions
﻿ | December 31, 2016 |  | December 31, 2015 |
﻿ |  | 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 |  | $ | 141 |  | $ | - |  | $ | - |  | $ | 141 |  |  | $ | 152 |  | $ | - |  | $ | 6 |  | $ | 146 |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Debt securities |  |  | 13 |  |  | - |  |  | - |  |  | 13 |  |  |  | 11 |  |  | - |  |  | - |  |  | 11 |
﻿Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Mutual funds |  | $ | 102 |  | $ | - |  | $ | - |  | $ | 102 |  |  | $ | 108 |  | $ | - |  | $ | 4 |  | $ | 104 |
﻿CMS Energy common stock |  |  | 4 |  |  | 29 |  |  | - |  |  | 33 |  |  |  | 4 |  |  | 25 |  |  | - |  |  | 29 |
﻿
Schedule Of Sales Activity For Investment Securities |
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |
﻿In Millions
﻿Years Ended December 31 | 2016 | 2015 | 2014 |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
﻿Proceeds from sales of investment securities |  | $ | 6 |  | $ | 3 |  | $ | 8 |
﻿Consumers |  |  |  |  |  |  |  |  |  |
﻿Proceeds from sales of investment securities |  | $ | 4 |  | $ | 2 |  | $ | 6 |
﻿
Consumers Energy Company [Member] |
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿In Millions
﻿ | December 31, 2016 |  | December 31, 2015 |
﻿ |  | 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 |  |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | - |
﻿Notes receivable 2 |  |  | 1,326 |  |  | 1,415 |  |  | - |  |  | - |  |  | 1,415 |  |  |  | 1,161 |  |  | 1,228 |  |  | - |  |  | - |  |  | 1,228 |
﻿Securities held to maturity |  |  | 13 |  |  | 13 |  |  | - |  |  | 13 |  |  | - |  |  |  | 11 |  |  | 11 |  |  | - |  |  | 11 |  |  | - |
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term debt 3 |  |  | 9,504 |  |  | 9,953 |  |  | - |  |  | 8,990 |  |  | 963 |  |  |  | 9,084 |  |  | 9,599 |  |  | - |  |  | 8,648 |  |  | 951 |
﻿Long-term payables 4 |  |  | 17 |  |  | 17 |  |  | - |  |  | - |  |  | 17 |  |  |  | 14 |  |  | 14 |  |  | - |  |  | - |  |  | 14 |
﻿Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term receivables 1 |  | $ | 22 |  | $ | 22 |  | $ | - |  | $ | - |  | $ | 22 |  |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | - |
﻿Notes receivable 5 |  |  | 45 |  |  | 45 |  |  | - |  |  | - |  |  | 45 |  |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |
﻿Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Long-term debt 6 |  |  | 5,628 |  |  | 5,903 |  |  | - |  |  | 4,940 |  |  | 963 |  |  |  | 5,381 |  |  | 5,684 |  |  | - |  |  | 4,733 |  |  | 951 |
﻿
| 1 |  | Includes current accounts receivable of $12 million at December 31, 2016.
| 2 |  | Includes current portion of notes receivable of $219 million at December 31, 2016 and $144 million at December 31, 2015.
| 3 |  | Includes current portion of long-term debt of $864 million at December 31, 2016 and $684 million at December 31, 2015.
| 4 |  | Includes current portion of long-term payables of $1 million at December 31, 2016 and 2015.
| 5 |  | Includes current portion of notes receivable of $29 million at Decemb er 31, 2 016.
| 6 |  | Includes current portion of long-term debt of $375 million at December 31, 2016 and $198 million at December 31, 2015.
Schedule Of Investment Securities |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿In Millions
﻿ | December 31, 2016 |  | December 31, 2015 |
﻿ |  | 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 |  | $ | 141 |  | $ | - |  | $ | - |  | $ | 141 |  |  | $ | 152 |  | $ | - |  | $ | 6 |  | $ | 146 |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Debt securities |  |  | 13 |  |  | - |  |  | - |  |  | 13 |  |  |  | 11 |  |  | - |  |  | - |  |  | 11 |
﻿Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Mutual funds |  | $ | 102 |  | $ | - |  | $ | - |  | $ | 102 |  |  | $ | 108 |  | $ | - |  | $ | 4 |  | $ | 104 |
﻿CMS Energy common stock |  |  | 4 |  |  | 29 |  |  | - |  |  | 33 |  |  |  | 4 |  |  | 25 |  |  | - |  |  | 29 |
﻿
Schedule Of Sales Activity For Investment Securities |
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |
﻿In Millions
﻿Years Ended December 31 | 2016 | 2015 | 2014 |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
﻿Proceeds from sales of investment securities |  | $ | 6 |  | $ | 3 |  | $ | 8 |
﻿Consumers |  |  |  |  |  |  |  |  |  |
﻿Proceeds from sales of investment securities |  | $ | 4 |  | $ | 2 |  | $ | 6 |
﻿

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