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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, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Other operating expense |  |  |  |  |  |  |  |  | $ (1,236) | $ (1,224) |  | $ (1,237) |
General taxes |  |  |  |  |  |  |  |  | 234 | 229 |  | 205 |
Total operating expenses |  |  |  |  |  |  |  |  | (5,424) | (5,250) |  | (5,500) |
Operating Loss | 264 | 317 | 232 | 329 | 212 | 343 | 260 | 188 | 1,142 | 1,003 |  | 1,003 |
Interest income |  |  |  |  |  |  |  |  | 3 | 5 |  | 9 |
Total other income (expense) |  |  |  |  |  |  |  |  | 12 | 8 |  | 18 |
Interest on long-term debt |  |  |  |  |  |  |  |  | 385 | 372 |  | 396 |
Intercompany interest expense and other |  |  |  |  |  |  |  |  | 16 | 21 |  | 23 |
Total interest charges |  |  |  |  |  |  |  |  | 398 | 389 |  | 415 |
Income Before Income Taxes |  |  |  |  |  |  |  |  | 756 | 622 |  | 606 |
Income Tax Benefit |  |  |  |  |  |  |  |  | 302 | 245 |  | 191 |
Income From Continuing Operations | 102 | 127 | 81 | 144 | 67 | 149 | 101 | 60 | 454 | 377 |  | 415 |
Income From Discontinued Operations, Net |  |  |  |  |  |  |  | 7 |  | 7 | [1] | 2 | [2]
Net Income Available to Common Stockholders | 102 | 126 | 80 | 144 | 67 | 148 | 100 | 67 | 452 | 382 |  | 415 |
CMS Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Other operating expense |  |  |  |  |  |  |  |  | (6) | (8) |  | (9) |
General taxes |  |  |  |  |  |  |  |  |  |  |  | 6 |
Total operating expenses |  |  |  |  |  |  |  |  | (6) | (8) |  | (3) |
Operating Loss |  |  |  |  |  |  |  |  | (6) | (8) |  | (3) |
Equity earnings of subsidiaries |  |  |  |  |  |  |  |  | 566 | 477 |  | 510 |
Interest income |  |  |  |  |  |  |  |  | 1 | 1 |  | 1 |
Other expense |  |  |  |  |  |  |  |  | (8) | (5) |  | (5) |
Total other income (expense) |  |  |  |  |  |  |  |  | 559 | 473 |  | 506 |
Interest on long-term debt |  |  |  |  |  |  |  |  | 148 | 140 |  | 143 |
Intercompany interest expense and other |  |  |  |  |  |  |  |  | 3 | 5 |  | 6 |
Total interest charges |  |  |  |  |  |  |  |  | 151 | 145 |  | 149 |
Income Before Income Taxes |  |  |  |  |  |  |  |  | 402 | 320 |  | 354 |
Income Tax Benefit |  |  |  |  |  |  |  |  | (50) | (62) |  | (61) |
Income From Continuing Operations |  |  |  |  |  |  |  |  | 452 | 382 |  | 415 |
Net Income Available to Common Stockholders |  |  |  |  |  |  |  |  | $ 452 | $ 382 |  | $ 415 |
[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.

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