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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2014
Assets And Liabilities Measured At Fair Value On A Recurring Basis |
In Millions
| CMS Energy, including Consumers |  | Consumers |
December 31 | 2014 |  | 2013 |  | 2014 |  | 2013 |
Assets 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 110 |  |  | $ | 87 |  |  | $ | 19 |  |  | $ | - |
Restricted cash equivalents |  |  | 38 |  |  |  | 16 |  |  |  | 38 |  |  |  | 15 |
CMS Energy common stock |  |  | - |  |  |  | - |  |  |  | 38 |  |  |  | 29 |
Nonqualified deferred compensation plan assets |  |  | 8 |  |  |  | 6 |  |  |  | 6 |  |  |  | 4 |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 4 |  |  |  | - |  |  |  | 3 |  |  |  | - |
Mutual funds |  |  | 127 |  |  |  | 136 |  |  |  | 90 |  |  |  | 95 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 2 |  |  |  | 5 |  |  |  | 2 |  |  |  | 4 |
Total |  | $ | 289 |  |  | $ | 250 |  |  | $ | 196 |  |  | $ | 147 |
Liabilities 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 8 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 4 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | - |
Total |  | $ | 9 |  |  | $ | 7 |  |  | $ | 7 |  |  | $ | 4 |
| 1 |  | All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 2 or Level 3, and which were insignificant at December 31, 2014 and 2013.
Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs |
In Millions
Years Ended December 31 | 2014 | 2013 | 2012 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 4 |  | $ | 2 |  | $ | (2) |
Total gains included in earnings 1 |  |  | - |  |  | - |  |  | 3 |
Total gains (losses) offset through regulatory accounting |  |  | (15) |  |  | 3 |  |  | 6 |
Purchases |  |  | (1) |  |  | - |  |  | 1 |
Settlements |  |  | 13 |  |  | (1) |  |  | (6) |
Balance at end of period |  | $ | 1 |  | $ | 4 |  | $ | 2 |
Unrealized gains (losses) included in earnings relating to assets and liabilities |  |  |  |  |  |  |  |  |  |
still held at end of period 1 |  | $ | - |  | $ | (1) |  | $ | 2 |
Consumers |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 4 |  | $ | 2 |  | $ | 2 |
Total gains (losses) offset through regulatory accounting |  |  | (15) |  |  | 3 |  |  | 6 |
Purchases |  |  | (1) |  |  | - |  |  | 1 |
Settlements |  |  | 13 |  |  | (1) |  |  | (7) |
Balance at end of period |  | $ | 1 |  | $ | 4 |  | $ | 2 |
| 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 maintenance and other operating expenses 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 | 2014 |  | 2013 |  | 2014 |  | 2013 |
Assets 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 110 |  |  | $ | 87 |  |  | $ | 19 |  |  | $ | - |
Restricted cash equivalents |  |  | 38 |  |  |  | 16 |  |  |  | 38 |  |  |  | 15 |
CMS Energy common stock |  |  | - |  |  |  | - |  |  |  | 38 |  |  |  | 29 |
Nonqualified deferred compensation plan assets |  |  | 8 |  |  |  | 6 |  |  |  | 6 |  |  |  | 4 |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 4 |  |  |  | - |  |  |  | 3 |  |  |  | - |
Mutual funds |  |  | 127 |  |  |  | 136 |  |  |  | 90 |  |  |  | 95 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 2 |  |  |  | 5 |  |  |  | 2 |  |  |  | 4 |
Total |  | $ | 289 |  |  | $ | 250 |  |  | $ | 196 |  |  | $ | 147 |
Liabilities 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 8 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 4 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | - |
Total |  | $ | 9 |  |  | $ | 7 |  |  | $ | 7 |  |  | $ | 4 |
| 1 |  | All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 2 or Level 3, and which were insignificant at December 31, 2014 and 2013.
Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs |
In Millions
Years Ended December 31 | 2014 | 2013 | 2012 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 4 |  | $ | 2 |  | $ | (2) |
Total gains included in earnings 1 |  |  | - |  |  | - |  |  | 3 |
Total gains (losses) offset through regulatory accounting |  |  | (15) |  |  | 3 |  |  | 6 |
Purchases |  |  | (1) |  |  | - |  |  | 1 |
Settlements |  |  | 13 |  |  | (1) |  |  | (6) |
Balance at end of period |  | $ | 1 |  | $ | 4 |  | $ | 2 |
Unrealized gains (losses) included in earnings relating to assets and liabilities |  |  |  |  |  |  |  |  |  |
still held at end of period 1 |  | $ | - |  | $ | (1) |  | $ | 2 |
Consumers |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 4 |  | $ | 2 |  | $ | 2 |
Total gains (losses) offset through regulatory accounting |  |  | (15) |  |  | 3 |  |  | 6 |
Purchases |  |  | (1) |  |  | - |  |  | 1 |
Settlements |  |  | 13 |  |  | (1) |  |  | (7) |
Balance at end of period |  | $ | 1 |  | $ | 4 |  | $ | 2 |
| 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 maintenance and other operating expenses on its consolidated statements of income.

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