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Financial Instruments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2012
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
In Millions
| December 31, 2012 |  | December 31, 2011 |
| Carrying |  | Fair Value |  | Carrying |  |  |  |
| Amount |  | Total | Level 1 | Level 2 | Level 3 |  | Amount | Fair Value |
CMS Energy, including Consumers |
Securities held to |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
maturity |  | $ | 9 |  |  | $ | 10 |  | $ | - |  | $ | 10 |  | $ | - |  |  | $ | 7 |  | $ | 7 |
Notes receivable1 |  |  | 544 |  |  |  | 581 |  |  | - |  |  | - |  |  | 581 |  |  |  | 480 |  |  | 504 |
Long-term debt2 |  |  | 7,229 |  |  |  | 8,347 |  |  | - |  |  | 7,321 |  |  | 1,026 |  |  |  | 7,073 |  |  | 8,025 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt3 |  | $ | 4,338 |  |  | $ | 5,015 |  | $ | - |  | $ | 3,989 |  | $ | 1,026 |  |  | $ | 4,326 |  | $ | 4,882 |
1 | Includes current portion of notes receivable of $40 million at December 31, 2012 and $19 million at December 31, 2011.
2 | Includes current portion of long-term debt of $519 million at December 31, 2012 and $1,033 million at December 31, 2011.
3 | Includes current portion of long-term debt of $41 million at December 31, 2012 and $339 million at December 31, 2011.
Schedule Of Investment Securities |
In Millions
| December 31, 2012 |  | December 31, 2011 |
|  | Unrealized | Unrealized | Fair |  |  | Unrealized | Unrealized | Fair |
| Cost | Gains | Losses | Value |  | Cost | Gains | Losses | Value |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 123 |  | $ | 3 |  | $ | - |  | $ | 126 |  |  | $ | 113 |  | $ | - |  | $ | - |  | $ | 113 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 9 |  |  | 1 |  |  | - |  |  | 10 |  |  |  | 7 |  |  | - |  |  | - |  |  | 7 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 83 |  | $ | 2 |  | $ | - |  | $ | 85 |  |  | $ | 74 |  | $ | - |  | $ | - |  | $ | 74 |
CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
common stock |  |  | 6 |  |  | 26 |  |  | - |  |  | 32 |  |  |  | 7 |  |  | 28 |  |  | - |  |  | 35 |
Schedule Of Proceeds And Gross Realized Gains/Losses From Sales Of Available-For-Sale Securities |
In Millions
Years Ended December 31 | 2012 | 2011 | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 3 |  | $ | 29 |  | $ | 1 |
Consumers |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 2 |  | $ | 19 |  | $ | - |
Consumers Energy Company [Member] |
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
In Millions
| December 31, 2012 |  | December 31, 2011 |
| Carrying |  | Fair Value |  | Carrying |  |  |  |
| Amount |  | Total | Level 1 | Level 2 | Level 3 |  | Amount | Fair Value |
CMS Energy, including Consumers |
Securities held to |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
maturity |  | $ | 9 |  |  | $ | 10 |  | $ | - |  | $ | 10 |  | $ | - |  |  | $ | 7 |  | $ | 7 |
Notes receivable1 |  |  | 544 |  |  |  | 581 |  |  | - |  |  | - |  |  | 581 |  |  |  | 480 |  |  | 504 |
Long-term debt2 |  |  | 7,229 |  |  |  | 8,347 |  |  | - |  |  | 7,321 |  |  | 1,026 |  |  |  | 7,073 |  |  | 8,025 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt3 |  | $ | 4,338 |  |  | $ | 5,015 |  | $ | - |  | $ | 3,989 |  | $ | 1,026 |  |  | $ | 4,326 |  | $ | 4,882 |
1 | Includes current portion of notes receivable of $40 million at December 31, 2012 and $19 million at December 31, 2011.
2 | Includes current portion of long-term debt of $519 million at December 31, 2012 and $1,033 million at December 31, 2011.
3 | Includes current portion of long-term debt of $41 million at December 31, 2012 and $339 million at December 31, 2011.
Schedule Of Investment Securities |
In Millions
| December 31, 2012 |  | December 31, 2011 |
|  | Unrealized | Unrealized | Fair |  |  | Unrealized | Unrealized | Fair |
| Cost | Gains | Losses | Value |  | Cost | Gains | Losses | Value |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 123 |  | $ | 3 |  | $ | - |  | $ | 126 |  |  | $ | 113 |  | $ | - |  | $ | - |  | $ | 113 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 9 |  |  | 1 |  |  | - |  |  | 10 |  |  |  | 7 |  |  | - |  |  | - |  |  | 7 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 83 |  | $ | 2 |  | $ | - |  | $ | 85 |  |  | $ | 74 |  | $ | - |  | $ | - |  | $ | 74 |
CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
common stock |  |  | 6 |  |  | 26 |  |  | - |  |  | 32 |  |  |  | 7 |  |  | 28 |  |  | - |  |  | 35 |
Schedule Of Proceeds And Gross Realized Gains/Losses From Sales Of Available-For-Sale Securities |
In Millions
Years Ended December 31 | 2012 | 2011 | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 3 |  | $ | 29 |  | $ | 1 |
Consumers |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 2 |  | $ | 19 |  | $ | - |

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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 14 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph c(2), d, e, f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15 -Subparagraph b-d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 19 -Subparagraph a, b, c(1), d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a, c(1), c(2), c(3), d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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