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Schedule I - Condensed Financial Information of Registrant (Condensed Statements of Income) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Other operating expense |  |  |  |  |  |  |  |  | $ 1,225 |  | $ 1,237 |  | $ 1,206 |
General taxes |  |  |  |  |  |  |  |  | 229 |  | 205 |  | 210 |
Total operating expenses |  |  |  |  |  |  |  |  | 5,250 |  | 5,500 |  | 5,454 |
Operating Loss | 212 | 343 | 260 | 188 | 174 | 316 | 207 | 306 | 1,003 |  | 1,003 |  | 978 |
Interest income |  |  |  |  |  |  |  |  | 5 |  | 9 |  | 19 |
Total other income |  |  |  |  |  |  |  |  | 8 |  | 18 |  | 43 |
Interest on long-term debt |  |  |  |  |  |  |  |  | 372 |  | 396 |  | 394 |
Intercompany interest expense and other |  |  |  |  |  |  |  |  | 21 |  | 23 |  | 40 |
Total interest charges |  |  |  |  |  |  |  |  | 389 |  | 415 |  | 431 |
Income Before Income Taxes |  |  |  |  |  |  |  |  | 622 |  | 606 |  | 590 |
Income Tax Benefit |  |  |  |  |  |  |  |  | 245 |  | 191 |  | 224 |
Income From Continuing Operations | 67 | 149 | 101 | 60 | 41 | 140 | 101 | 133 | 377 |  | 415 |  | 366 |
Income (Loss) From Discontinued Operations |  |  |  | 7 |  |  |  | 2 | 7 | [1] | 2 | [2] | (23) | [3]
Net Income | 67 | 149 | 101 | 67 | 41 | 140 | 101 | 135 | 384 |  | 417 |  | 343 |
Charge for Deferred Issuance Costs on Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  | 8 |
Preferred Stock Dividends |  |  |  |  |  |  |  |  |  |  |  |  | 8 |
Net Income Available to Common Stockholders | 67 | 148 | 100 | 67 | 41 | 139 | 100 | 135 | 382 |  | 415 |  | 324 |
CMS Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operating expense |  |  |  |  |  |  |  |  | (8) |  | (9) |  | (6) |
General taxes |  |  |  |  |  |  |  |  |  |  | 6 |  |  |
Total operating expenses |  |  |  |  |  |  |  |  | (8) |  | (3) |  | (6) |
Operating Loss |  |  |  |  |  |  |  |  | (8) |  | (3) |  | (6) |
Equity earnings of subsidiaries |  |  |  |  |  |  |  |  | 477 |  | 510 |  | 464 |
Interest income |  |  |  |  |  |  |  |  | 1 |  | 1 |  | 1 |
Other expense |  |  |  |  |  |  |  |  | (5) |  | (5) |  | (8) |
Total other income |  |  |  |  |  |  |  |  | 473 |  | 506 |  | 457 |
Interest on long-term debt |  |  |  |  |  |  |  |  | 140 |  | 143 |  | 147 |
Intercompany interest expense and other |  |  |  |  |  |  |  |  | 5 |  | 6 |  | 4 |
Total interest charges |  |  |  |  |  |  |  |  | 145 |  | 149 |  | 151 |
Income Before Income Taxes |  |  |  |  |  |  |  |  | 320 |  | 354 |  | 300 |
Income Tax Benefit |  |  |  |  |  |  |  |  | (62) |  | (61) |  | (50) |
Income From Continuing Operations |  |  |  |  |  |  |  |  | 382 |  | 415 |  | 350 |
Income (Loss) From Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  | (10) |
Net Income |  |  |  |  |  |  |  |  | 382 |  | 415 |  | 340 |
Charge for Deferred Issuance Costs on Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  | 8 |
Preferred Stock Dividends |  |  |  |  |  |  |  |  |  |  |  |  | 8 |
Net Income Available to Common Stockholders |  |  |  |  |  |  |  |  | $ 382 |  | $ 415 |  | $ 324 |
[1] | Includes an $11 million ($7 million net of tax) reversal of a loss on disposal due to the elimination of a liability associated with the 2003 sale of Panhandle.
[2] | Includes an operating gain of $3 million related to a litigation settlement at CMS Viron.
[3] | Includes an operating loss of $2 million ($1 million net of tax) at Exeter, whose assets and liabilities were reclassified as held for sale in 2009.

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