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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2016
Assets And Liabilities Measured At Fair Value On A Recurring Basis |
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﻿In Millions
﻿ | CMS Energy, including Consumers |  | Consumers |
﻿December 31 | 2016 |  | 2015 |  | 2016 |  | 2015 |
﻿Assets 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash equivalents |  | $ | 44 |  |  | $ | 158 |  |  | $ | - |  |  | $ | - |
﻿Restricted cash equivalents |  |  | 19 |  |  |  | 19 |  |  |  | 19 |  |  |  | 19 |
﻿CMS Energy common stock |  |  | - |  |  |  | - |  |  |  | 33 |  |  |  | 29 |
﻿Nonqualified deferred compensation plan assets |  |  | 12 |  |  |  | 10 |  |  |  | 8 |  |  |  | 7 |
﻿DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash equivalents |  |  | 3 |  |  |  | 2 |  |  |  | 2 |  |  |  | 2 |
﻿Mutual funds |  |  | 141 |  |  |  | 146 |  |  |  | 102 |  |  |  | 104 |
﻿Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Commodity contracts |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |
﻿Total |  | $ | 220 |  |  | $ | 336 |  |  | $ | 165 |  |  | $ | 162 |
﻿Liabilities 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Nonqualified deferred compensation plan liabilities |  | $ | 12 |  |  | $ | 10 |  |  | $ | 8 |  |  | $ | 7 |
﻿Total |  | $ | 12 |  |  | $ | 10 |  |  | $ | 8 |  |  | $ | 7 |
﻿
| 1 |  | All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 3.
Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs |
﻿In Millions
﻿Years Ended December 31 | 2016 | 2015 | 2014 |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
﻿Balance at beginning of period |  | $ | 1 |  | $ | 1 |  | $ | 4 |
﻿Total gains (losses) included in earnings 1 |  |  | 1 |  |  | (1) |  |  | - |
﻿Total gains (losses) offset through regulatory accounting |  |  | (2) |  |  | 2 |  |  | (15) |
﻿Purchases |  |  | 2 |  |  | 1 |  |  | (1) |
﻿Settlements |  |  | (1) |  |  | (2) |  |  | 13 |
﻿Balance at end of period |  | $ | 1 |  | $ | 1 |  | $ | 1 |
﻿Consumers |  |  |  |  |  |  |  |  |  |
﻿Balance at beginning of period |  | $ | 1 |  | $ | 1 |  | $ | 4 |
﻿Total gains included in earnings 1 |  |  | 1 |  |  | - |  |  | - |
﻿Total gains (losses) offset through regulatory accounting |  |  | (2) |  |  | 2 |  |  | (15) |
﻿Purchases |  |  | 2 |  |  | - |  |  | (1) |
﻿Settlements |  |  | (1) |  |  | (2) |  |  | 13 |
﻿Balance at end of period |  | $ | 1 |  | $ | 1 |  | $ | 1 |
﻿
| 1 |  | CMS Energy and Consumers record realized gains and losses for Level 3 recurring fair value measurements in earnings as a component of maintenance and other operating expenses or purchased and interchange power on their consolidated statements of income.
Consumers Energy Company [Member] |
Assets And Liabilities Measured At Fair Value On A Recurring Basis |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿In Millions
﻿ | CMS Energy, including Consumers |  | Consumers |
﻿December 31 | 2016 |  | 2015 |  | 2016 |  | 2015 |
﻿Assets 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash equivalents |  | $ | 44 |  |  | $ | 158 |  |  | $ | - |  |  | $ | - |
﻿Restricted cash equivalents |  |  | 19 |  |  |  | 19 |  |  |  | 19 |  |  |  | 19 |
﻿CMS Energy common stock |  |  | - |  |  |  | - |  |  |  | 33 |  |  |  | 29 |
﻿Nonqualified deferred compensation plan assets |  |  | 12 |  |  |  | 10 |  |  |  | 8 |  |  |  | 7 |
﻿DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Cash equivalents |  |  | 3 |  |  |  | 2 |  |  |  | 2 |  |  |  | 2 |
﻿Mutual funds |  |  | 141 |  |  |  | 146 |  |  |  | 102 |  |  |  | 104 |
﻿Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Commodity contracts |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |
﻿Total |  | $ | 220 |  |  | $ | 336 |  |  | $ | 165 |  |  | $ | 162 |
﻿Liabilities 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Nonqualified deferred compensation plan liabilities |  | $ | 12 |  |  | $ | 10 |  |  | $ | 8 |  |  | $ | 7 |
﻿Total |  | $ | 12 |  |  | $ | 10 |  |  | $ | 8 |  |  | $ | 7 |
﻿
| 1 |  | All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 3.
Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs |
﻿In Millions
﻿Years Ended December 31 | 2016 | 2015 | 2014 |
﻿CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
﻿Balance at beginning of period |  | $ | 1 |  | $ | 1 |  | $ | 4 |
﻿Total gains (losses) included in earnings 1 |  |  | 1 |  |  | (1) |  |  | - |
﻿Total gains (losses) offset through regulatory accounting |  |  | (2) |  |  | 2 |  |  | (15) |
﻿Purchases |  |  | 2 |  |  | 1 |  |  | (1) |
﻿Settlements |  |  | (1) |  |  | (2) |  |  | 13 |
﻿Balance at end of period |  | $ | 1 |  | $ | 1 |  | $ | 1 |
﻿Consumers |  |  |  |  |  |  |  |  |  |
﻿Balance at beginning of period |  | $ | 1 |  | $ | 1 |  | $ | 4 |
﻿Total gains included in earnings 1 |  |  | 1 |  |  | - |  |  | - |
﻿Total gains (losses) offset through regulatory accounting |  |  | (2) |  |  | 2 |  |  | (15) |
﻿Purchases |  |  | 2 |  |  | - |  |  | (1) |
﻿Settlements |  |  | (1) |  |  | (2) |  |  | 13 |
﻿Balance at end of period |  | $ | 1 |  | $ | 1 |  | $ | 1 |
﻿
| 1 |  | CMS Energy and Consumers record realized gains and losses for Level 3 recurring fair value measurements in earnings as a component of maintenance and other operating expenses or purchased and interchange power on their consolidated statements of income.

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- Definition Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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