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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2015
Assets And Liabilities Measured At Fair Value On A Recurring Basis |
In Millions
| CMS Energy, including Consumers |  | Consumers |
| June 30 |  | December 31 |  | June 30 |  | December 31 |
| 2015 |  | 2014 |  | 2015 |  | 2014 |
Assets 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 291 |  |  | $ | 110 |  |  | $ | 251 |  |  | $ | 19 |
Restricted cash equivalents |  |  | 40 |  |  |  | 38 |  |  |  | 40 |  |  |  | 38 |
CMS Energy common stock |  |  | - |  |  |  | - |  |  |  | 26 |  |  |  | 38 |
Nonqualified deferred compensation plan assets |  |  | 9 |  |  |  | 8 |  |  |  | 6 |  |  |  | 6 |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 2 |  |  |  | 4 |  |  |  | 2 |  |  |  | 3 |
Mutual funds |  |  | 150 |  |  |  | 127 |  |  |  | 107 |  |  |  | 90 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 4 |  |  |  | 2 |  |  |  | 4 |  |  |  | 2 |
Total |  | $ | 496 |  |  | $ | 289 |  |  | $ | 436 |  |  | $ | 196 |
Liabilities 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 9 |  |  | $ | 8 |  |  | $ | 6 |  |  | $ | 6 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 1 |  |  |  | 1 |  |  |  | 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 2 or Level 3 and which were insignificant at June 30, 2015 and December 31, 2014.
Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs |
In Millions
| Three Months Ended |  | Six Months Ended |
June 30 | 2015 | 2014 |  | 2015 | 2014 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 1 |  | $ | - |  |  | $ | 1 |  | $ | 4 |
Total gains (losses) offset through regulatory accounting |  |  | 2 |  |  | 1 |  |  |  | 3 |  |  | (18) |
Purchases |  |  | - |  |  | - |  |  |  | - |  |  | (1) |
Settlements |  |  | - |  |  | - |  |  |  | (1) |  |  | 16 |
Balance at end of period |  | $ | 3 |  | $ | 1 |  |  | $ | 3 |  | $ | 1 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 1 |  | $ | - |  |  | $ | 1 |  | $ | 4 |
Total gains (losses) offset through regulatory accounting |  |  | 2 |  |  | 1 |  |  |  | 3 |  |  | (18) |
Purchases |  |  | - |  |  | - |  |  |  | - |  |  | (1) |
Settlements |  |  | - |  |  | - |  |  |  | (1) |  |  | 16 |
Balance at end of period |  | $ | 3 |  | $ | 1 |  |  | $ | 3 |  | $ | 1 |
Consumers Energy Company [Member] |
Assets And Liabilities Measured At Fair Value On A Recurring Basis |
In Millions
| CMS Energy, including Consumers |  | Consumers |
| June 30 |  | December 31 |  | June 30 |  | December 31 |
| 2015 |  | 2014 |  | 2015 |  | 2014 |
Assets 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 291 |  |  | $ | 110 |  |  | $ | 251 |  |  | $ | 19 |
Restricted cash equivalents |  |  | 40 |  |  |  | 38 |  |  |  | 40 |  |  |  | 38 |
CMS Energy common stock |  |  | - |  |  |  | - |  |  |  | 26 |  |  |  | 38 |
Nonqualified deferred compensation plan assets |  |  | 9 |  |  |  | 8 |  |  |  | 6 |  |  |  | 6 |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 2 |  |  |  | 4 |  |  |  | 2 |  |  |  | 3 |
Mutual funds |  |  | 150 |  |  |  | 127 |  |  |  | 107 |  |  |  | 90 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 4 |  |  |  | 2 |  |  |  | 4 |  |  |  | 2 |
Total |  | $ | 496 |  |  | $ | 289 |  |  | $ | 436 |  |  | $ | 196 |
Liabilities 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 9 |  |  | $ | 8 |  |  | $ | 6 |  |  | $ | 6 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 1 |  |  |  | 1 |  |  |  | 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 2 or Level 3 and which were insignificant at June 30, 2015 and December 31, 2014.
Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs |
In Millions
| Three Months Ended |  | Six Months Ended |
June 30 | 2015 | 2014 |  | 2015 | 2014 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 1 |  | $ | - |  |  | $ | 1 |  | $ | 4 |
Total gains (losses) offset through regulatory accounting |  |  | 2 |  |  | 1 |  |  |  | 3 |  |  | (18) |
Purchases |  |  | - |  |  | - |  |  |  | - |  |  | (1) |
Settlements |  |  | - |  |  | - |  |  |  | (1) |  |  | 16 |
Balance at end of period |  | $ | 3 |  | $ | 1 |  |  | $ | 3 |  | $ | 1 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 1 |  | $ | - |  |  | $ | 1 |  | $ | 4 |
Total gains (losses) offset through regulatory accounting |  |  | 2 |  |  | 1 |  |  |  | 3 |  |  | (18) |
Purchases |  |  | - |  |  | - |  |  |  | - |  |  | (1) |
Settlements |  |  | - |  |  | - |  |  |  | (1) |  |  | 16 |
Balance at end of period |  | $ | 3 |  | $ | 1 |  |  | $ | 3 |  | $ | 1 |

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