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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2014
Assets And Liabilities Measured At Fair Value On A Recurring Basis |
In Millions
| CMS Energy, including Consumers |  | Consumers |
| September 30 |  | December 31 |  | September 30 |  | December 31 |
| 2014 |  | 2013 |  | 2014 |  | 2013 |
Assets 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 394 |  |  | $ | 87 |  |  | $ | 146 |  |  | $ | - |
Restricted cash equivalents |  |  | 37 |  |  |  | 16 |  |  |  | 37 |  |  |  | 15 |
CMS Energy common stock |  |  | - |  |  |  | - |  |  |  | 32 |  |  |  | 29 |
Nonqualified deferred compensation plan assets |  |  | 8 |  |  |  | 6 |  |  |  | 5 |  |  |  | 4 |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 2 |  |  |  | - |  |  |  | 1 |  |  |  | - |
Mutual funds |  |  | 131 |  |  |  | 136 |  |  |  | 93 |  |  |  | 95 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 4 |  |  |  | 5 |  |  |  | 3 |  |  |  | 4 |
Total |  | $ | 576 |  |  | $ | 250 |  |  | $ | 317 |  |  | $ | 147 |
Liabilities 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 8 |  |  | $ | 6 |  |  | $ | 5 |  |  | $ | 4 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 2 |  |  |  | 1 |  |  |  | 2 |  |  |  | - |
Total |  | $ | 10 |  |  | $ | 7 |  |  | $ | 7 |  |  | $ | 4 |
| 1 |  | All assets and liabilities were classified as Level 1 with the exception of commodity contracts, which were classified as Level 2 or Level 3, and which were insignificant at September 30, 2014.
Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs |
In Millions
| Three Months Ended |  | Nine Months Ended |
September 30 | 2014 | 2013 |  | 2014 | 2013 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 1 |  | $ | 8 |  |  | $ | 4 |  | $ | 2 |
Total gains (losses) offset through regulatory accounting |  |  | 2 |  |  | (2) |  |  |  | (16) |  |  | 5 |
Purchases |  |  | - |  |  | 1 |  |  |  | (1) |  |  | - |
Settlements |  |  | (2) |  |  | (1) |  |  |  | 14 |  |  | (1) |
Balance at end of period |  | $ | 1 |  | $ | 6 |  |  | $ | 1 |  | $ | 6 |
Unrealized gains included in earnings relating to assets and liabilities still held at end of period 1 |  | $ | - |  | $ | 1 |  |  | $ | - |  | $ | - |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 1 |  | $ | 10 |  |  | $ | 4 |  | $ | 2 |
Total gains (losses) offset through regulatory accounting |  |  | 2 |  |  | (2) |  |  |  | (16) |  |  | 5 |
Purchases |  |  | - |  |  | (1) |  |  |  | (1) |  |  | - |
Settlements |  |  | (2) |  |  | (1) |  |  |  | 14 |  |  | (1) |
Balance at end of period |  | $ | 1 |  | $ | 6 |  |  | $ | 1 |  | $ | 6 |
| 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 |
| September 30 |  | December 31 |  | September 30 |  | December 31 |
| 2014 |  | 2013 |  | 2014 |  | 2013 |
Assets 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 394 |  |  | $ | 87 |  |  | $ | 146 |  |  | $ | - |
Restricted cash equivalents |  |  | 37 |  |  |  | 16 |  |  |  | 37 |  |  |  | 15 |
CMS Energy common stock |  |  | - |  |  |  | - |  |  |  | 32 |  |  |  | 29 |
Nonqualified deferred compensation plan assets |  |  | 8 |  |  |  | 6 |  |  |  | 5 |  |  |  | 4 |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 2 |  |  |  | - |  |  |  | 1 |  |  |  | - |
Mutual funds |  |  | 131 |  |  |  | 136 |  |  |  | 93 |  |  |  | 95 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 4 |  |  |  | 5 |  |  |  | 3 |  |  |  | 4 |
Total |  | $ | 576 |  |  | $ | 250 |  |  | $ | 317 |  |  | $ | 147 |
Liabilities 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 8 |  |  | $ | 6 |  |  | $ | 5 |  |  | $ | 4 |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 2 |  |  |  | 1 |  |  |  | 2 |  |  |  | - |
Total |  | $ | 10 |  |  | $ | 7 |  |  | $ | 7 |  |  | $ | 4 |
| 1 |  | All assets and liabilities were classified as Level 1 with the exception of commodity contracts, which were classified as Level 2 or Level 3, and which were insignificant at September 30, 2014.
Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs |
In Millions
| Three Months Ended |  | Nine Months Ended |
September 30 | 2014 | 2013 |  | 2014 | 2013 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 1 |  | $ | 8 |  |  | $ | 4 |  | $ | 2 |
Total gains (losses) offset through regulatory accounting |  |  | 2 |  |  | (2) |  |  |  | (16) |  |  | 5 |
Purchases |  |  | - |  |  | 1 |  |  |  | (1) |  |  | - |
Settlements |  |  | (2) |  |  | (1) |  |  |  | 14 |  |  | (1) |
Balance at end of period |  | $ | 1 |  | $ | 6 |  |  | $ | 1 |  | $ | 6 |
Unrealized gains included in earnings relating to assets and liabilities still held at end of period 1 |  | $ | - |  | $ | 1 |  |  | $ | - |  | $ | - |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 1 |  | $ | 10 |  |  | $ | 4 |  | $ | 2 |
Total gains (losses) offset through regulatory accounting |  |  | 2 |  |  | (2) |  |  |  | (16) |  |  | 5 |
Purchases |  |  | - |  |  | (1) |  |  |  | (1) |  |  | - |
Settlements |  |  | (2) |  |  | (1) |  |  |  | 14 |  |  | (1) |
Balance at end of period |  | $ | 1 |  | $ | 6 |  |  | $ | 1 |  | $ | 6 |
| 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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- 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 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 Reference 2: 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=36462937&loc=d3e19207-110258 + 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=36462937&loc=d3e19190-110258 + Details
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