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Schedule I - Condensed Financial Information of Registrant (Condensed Statements of Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Other operating expense |  |  |  |  |  |  |  |  | $ (1,238) | $ (1,232) | $ (1,236)
General taxes |  |  |  |  |  |  |  |  | 262 | 252 | 234
Total operating expenses |  |  |  |  |  |  |  |  | (5,293) | (6,027) | (5,424)
Operating Loss | $ 245 | $ 317 | $ 204 | $ 397 | $ 273 | $ 236 | $ 235 | $ 408 | 1,163 | 1,152 | 1,142
Interest income |  |  |  |  |  |  |  |  | 12 | 5 | 3
Total other income (expense) |  |  |  |  |  |  |  |  | 29 | (16) | 12
Interest on long-term debt |  |  |  |  |  |  |  |  | 386 | 393 | 385
Intercompany interest expense and other |  |  |  |  |  |  |  |  | 14 | 17 | 16
Total interest charges |  |  |  |  |  |  |  |  | 396 | 407 | 398
Income Before Income Taxes |  |  |  |  |  |  |  |  | 796 | 729 | 756
Income Tax Expense |  |  |  |  |  |  |  |  | 271 | 250 | 302
Net income (loss) attributable to CMS Energy | $ 106 | $ 148 | $ 67 | $ 202 | $ 96 | $ 94 | $ 83 | $ 204 | 523 | 477 | 452
CMS Energy [Member] |  |  |  |  |  |  |  |  |  |  |
Other operating expense |  |  |  |  |  |  |  |  | (9) | (6) | (6)
Total operating expenses |  |  |  |  |  |  |  |  | (9) | (6) | (6)
Operating Loss |  |  |  |  |  |  |  |  | (9) | (6) | (6)
Equity earnings of subsidiaries |  |  |  |  |  |  |  |  | 625 | 585 | 566
Interest income |  |  |  |  |  |  |  |  | 1 | 1 | 1
Other expense |  |  |  |  |  |  |  |  | (9) | (20) | (8)
Total other income (expense) |  |  |  |  |  |  |  |  | 617 | 566 | 559
Interest on long-term debt |  |  |  |  |  |  |  |  | 134 | 150 | 148
Intercompany interest expense and other |  |  |  |  |  |  |  |  | 3 | 2 | 3
Total interest charges |  |  |  |  |  |  |  |  | 137 | 152 | 151
Income Before Income Taxes |  |  |  |  |  |  |  |  | 471 | 408 | 402
Income Tax Expense |  |  |  |  |  |  |  |  | (52) | (69) | (50)
Net income (loss) attributable to CMS Energy |  |  |  |  |  |  |  |  | $ 523 | $ 477 | $ 452

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