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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2015
Assets And Liabilities Measured At Fair Value On A Recurring Basis |
In Millions
| CMS Energy, including Consumers |  | Consumers |
December 31 | 2015 |  | 2014 |  | 2015 |  | 2014 |
Assets 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 158 |  |  | $ | 110 |  |  | $ | - |  |  | $ | 19 |
Restricted cash equivalents |  |  | 19 |  |  |  | 38 |  |  |  | 19 |  |  |  | 38 |
CMS Energy common stock |  |  | - |  |  |  | - |  |  |  | 29 |  |  |  | 38 |
Nonqualified deferred compensation plan assets |  |  | 10 |  |  |  | 8 |  |  |  | 7 |  |  |  | 6 |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 2 |  |  |  | 4 |  |  |  | 2 |  |  |  | 3 |
Mutual funds |  |  | 146 |  |  |  | 127 |  |  |  | 104 |  |  |  | 90 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 1 |  |  |  | 2 |  |  |  | 1 |  |  |  | 2 |
Total |  | $ | 336 |  |  | $ | 289 |  |  | $ | 162 |  |  | $ | 196 |
Liabilities 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 10 |  |  | $ | 8 |  |  | $ | 7 |  |  | $ | 6 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | - |  |  |  | 1 |  |  |  | - |  |  |  | 1 |
Total |  | $ | 10 |  |  | $ | 9 |  |  | $ | 7 |  |  | $ | 7 |
| 1 |  | All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 3 and which were insignificant at December 31, 2015 and 201 4.
Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs |
In Millions
Years Ended December 31 | 2015 | 2014 | 2013 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 1 |  | $ | 4 |  | $ | 2 |
Total losses included in earnings 1 |  |  | (1) |  |  | - |  |  | - |
Total gains (losses) offset through regulatory accounting |  |  | 2 |  |  | (15) |  |  | 3 |
Purchases |  |  | 1 |  |  | (1) |  |  | - |
Settlements |  |  | (2) |  |  | 13 |  |  | (1) |
Balance at end of period |  | $ | 1 |  | $ | 1 |  | $ | 4 |
Unrealized losses included in earnings relating to assets and liabilities |  |  |  |  |  |  |  |  |  |
still held at end of period 1 |  | $ | - |  | $ | - |  | $ | (1) |
Consumers |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 1 |  | $ | 4 |  | $ | 2 |
Total gains (losses) offset through regulatory accounting |  |  | 2 |  |  | (15) |  |  | 3 |
Purchases |  |  | - |  |  | (1) |  |  | - |
Settlements |  |  | (2) |  |  | 13 |  |  | (1) |
Balance at end of period |  | $ | 1 |  | $ | 1 |  | $ | 4 |
| 1 |  | CMS Energy records realized and unrealized gains and losses for Level 3 recurring fair value measurements in earnings as a component of operating revenue or purchased and interchange power on its 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 | 2015 |  | 2014 |  | 2015 |  | 2014 |
Assets 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 158 |  |  | $ | 110 |  |  | $ | - |  |  | $ | 19 |
Restricted cash equivalents |  |  | 19 |  |  |  | 38 |  |  |  | 19 |  |  |  | 38 |
CMS Energy common stock |  |  | - |  |  |  | - |  |  |  | 29 |  |  |  | 38 |
Nonqualified deferred compensation plan assets |  |  | 10 |  |  |  | 8 |  |  |  | 7 |  |  |  | 6 |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 2 |  |  |  | 4 |  |  |  | 2 |  |  |  | 3 |
Mutual funds |  |  | 146 |  |  |  | 127 |  |  |  | 104 |  |  |  | 90 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 1 |  |  |  | 2 |  |  |  | 1 |  |  |  | 2 |
Total |  | $ | 336 |  |  | $ | 289 |  |  | $ | 162 |  |  | $ | 196 |
Liabilities 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 10 |  |  | $ | 8 |  |  | $ | 7 |  |  | $ | 6 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | - |  |  |  | 1 |  |  |  | - |  |  |  | 1 |
Total |  | $ | 10 |  |  | $ | 9 |  |  | $ | 7 |  |  | $ | 7 |
| 1 |  | All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 3 and which were insignificant at December 31, 2015 and 201 4.
Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs |
In Millions
Years Ended December 31 | 2015 | 2014 | 2013 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 1 |  | $ | 4 |  | $ | 2 |
Total losses included in earnings 1 |  |  | (1) |  |  | - |  |  | - |
Total gains (losses) offset through regulatory accounting |  |  | 2 |  |  | (15) |  |  | 3 |
Purchases |  |  | 1 |  |  | (1) |  |  | - |
Settlements |  |  | (2) |  |  | 13 |  |  | (1) |
Balance at end of period |  | $ | 1 |  | $ | 1 |  | $ | 4 |
Unrealized losses included in earnings relating to assets and liabilities |  |  |  |  |  |  |  |  |  |
still held at end of period 1 |  | $ | - |  | $ | - |  | $ | (1) |
Consumers |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 1 |  | $ | 4 |  | $ | 2 |
Total gains (losses) offset through regulatory accounting |  |  | 2 |  |  | (15) |  |  | 3 |
Purchases |  |  | - |  |  | (1) |  |  | - |
Settlements |  |  | (2) |  |  | 13 |  |  | (1) |
Balance at end of period |  | $ | 1 |  | $ | 1 |  | $ | 4 |
| 1 |  | CMS Energy records realized and unrealized gains and losses for Level 3 recurring fair value measurements in earnings as a component of operating revenue or purchased and interchange power on its consolidated statements of income.

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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=36462937&loc=d3e19190-110258 + Details
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