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Financial Instruments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2013
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
In Millions
| December 31, 2013 |  | December 31, 2012 |
|  |  | Fair Value |  |  |  | Fair Value |
| Carrying |  |  |  |  | Level |  | Carrying |  |  |  |  | Level |
| Amount |  | Total | 1 | 2 | 3 |  | Amount |  | Total | 1 | 2 | 3 |
CMS Energy, including Consumers |
Securities held to maturity |  | $ | 10 |  |  | $ | 10 |  | $ | - |  | $ | 10 |  | $ | - |  |  | $ | 9 |  |  | $ | 10 |  | $ | - |  | $ | 10 |  | $ | - |
Notes receivable 1 |  |  | 683 |  |  |  | 724 |  |  | - |  |  | - |  |  | 724 |  |  |  | 544 |  |  |  | 581 |  |  | - |  |  | - |  |  | 581 |
Long-term debt 2 |  |  | 7,642 |  |  |  | 8,368 |  |  | - |  |  | 7,406 |  |  | 962 |  |  |  | 7,229 |  |  |  | 8,347 |  |  | - |  |  | 7,321 |  |  | 1,026 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 3 |  | $ | 4,622 |  |  | $ | 4,940 |  | $ | - |  | $ | 3,978 |  | $ | 962 |  |  | $ | 4,338 |  |  | $ | 5,015 |  | $ | - |  | $ | 3,989 |  | $ | 1,026 |
| 1 |  | Includes current portion of notes receivable of $48 million at December 31, 2013 and $40 million at December 31, 2012.
| 2 |  | Includes current portion of long-term debt of $541 million at December 31, 2013 and $519 million at December 31, 2012.
| 3 |  | Includes current portion of long-term debt of $43 million at December 31, 2013 and $41 million at December 31, 2012.
Schedule Of Investment Securities |
In Millions
| December 31, 2013 |  | December 31, 2012 |
|  | 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 |  | $ | 136 |  | $ | - |  | $ | - |  | $ | 136 |  |  | $ | 123 |  | $ | 3 |  | $ | - |  | $ | 126 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 10 |  |  | - |  |  | - |  |  | 10 |  |  |  | 9 |  |  | 1 |  |  | - |  |  | 10 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 95 |  | $ | - |  | $ | - |  | $ | 95 |  |  | $ | 83 |  | $ | 2 |  | $ | - |  | $ | 85 |
CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
common stock |  |  | 5 |  |  | 24 |  |  | - |  |  | 29 |  |  |  | 6 |  |  | 26 |  |  | - |  |  | 32 |
Schedule Of Proceeds And Gross Realized Gains/Losses From Sales Of Available-For-Sale Securities |
In Millions
Years Ended December 31 | 2013 | 2012 | 2011 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 3 |  | $ | 3 |  | $ | 29 |
Consumers |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 2 |  | $ | 2 |  | $ | 19 |
Consumers Energy Company [Member] |
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments |
In Millions
| December 31, 2013 |  | December 31, 2012 |
|  |  | Fair Value |  |  |  | Fair Value |
| Carrying |  |  |  |  | Level |  | Carrying |  |  |  |  | Level |
| Amount |  | Total | 1 | 2 | 3 |  | Amount |  | Total | 1 | 2 | 3 |
CMS Energy, including Consumers |
Securities held to maturity |  | $ | 10 |  |  | $ | 10 |  | $ | - |  | $ | 10 |  | $ | - |  |  | $ | 9 |  |  | $ | 10 |  | $ | - |  | $ | 10 |  | $ | - |
Notes receivable 1 |  |  | 683 |  |  |  | 724 |  |  | - |  |  | - |  |  | 724 |  |  |  | 544 |  |  |  | 581 |  |  | - |  |  | - |  |  | 581 |
Long-term debt 2 |  |  | 7,642 |  |  |  | 8,368 |  |  | - |  |  | 7,406 |  |  | 962 |  |  |  | 7,229 |  |  |  | 8,347 |  |  | - |  |  | 7,321 |  |  | 1,026 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt 3 |  | $ | 4,622 |  |  | $ | 4,940 |  | $ | - |  | $ | 3,978 |  | $ | 962 |  |  | $ | 4,338 |  |  | $ | 5,015 |  | $ | - |  | $ | 3,989 |  | $ | 1,026 |
| 1 |  | Includes current portion of notes receivable of $48 million at December 31, 2013 and $40 million at December 31, 2012.
| 2 |  | Includes current portion of long-term debt of $541 million at December 31, 2013 and $519 million at December 31, 2012.
| 3 |  | Includes current portion of long-term debt of $43 million at December 31, 2013 and $41 million at December 31, 2012.
Schedule Of Investment Securities |
In Millions
| December 31, 2013 |  | December 31, 2012 |
|  | 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 |  | $ | 136 |  | $ | - |  | $ | - |  | $ | 136 |  |  | $ | 123 |  | $ | 3 |  | $ | - |  | $ | 126 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 10 |  |  | - |  |  | - |  |  | 10 |  |  |  | 9 |  |  | 1 |  |  | - |  |  | 10 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 95 |  | $ | - |  | $ | - |  | $ | 95 |  |  | $ | 83 |  | $ | 2 |  | $ | - |  | $ | 85 |
CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
common stock |  |  | 5 |  |  | 24 |  |  | - |  |  | 29 |  |  |  | 6 |  |  | 26 |  |  | - |  |  | 32 |
Schedule Of Proceeds And Gross Realized Gains/Losses From Sales Of Available-For-Sale Securities |
In Millions
Years Ended December 31 | 2013 | 2012 | 2011 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 3 |  | $ | 3 |  | $ | 29 |
Consumers |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities |  | $ | 2 |  | $ | 2 |  | $ | 19 |

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