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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other operating expense |  |  |  |  |  |  |  |  | $ (1,207) | $ (1,238) | $ (1,232)
General taxes |  |  |  |  |  |  |  |  | 281 | 262 | 252
Total operating expenses |  |  |  |  |  |  |  |  | (5,102) | (5,293) | (6,027)
Operating Loss | $ 290 | $ 386 | $ 285 | $ 336 | $ 245 | $ 317 | $ 204 | $ 397 | 1,297 | 1,163 | 1,152
Interest income |  |  |  |  |  |  |  |  | 6 | 12 | 5
Total other income |  |  |  |  |  |  |  |  | (36) | 29 | (16)
Interest on long-term debt |  |  |  |  |  |  |  |  | 411 | 386 | 393
Intercompany interest expense and other |  |  |  |  |  |  |  |  | 29 | 14 | 17
Total interest charges |  |  |  |  |  |  |  |  | 435 | 396 | 407
Income Before Income Taxes |  |  |  |  |  |  |  |  | 826 | 796 | 729
Income Tax Expense |  |  |  |  |  |  |  |  | 273 | 271 | 250
Net income attributable to CMS Energy | $ 77 | $ 186 | $ 124 | $ 164 | $ 106 | $ 148 | $ 67 | $ 202 | 551 | 523 | 477
CMS Energy [Member] |  |  |  |  |  |  |  |  |  |  |
Other operating expense |  |  |  |  |  |  |  |  | (15) | (9) | (6)
Total operating expenses |  |  |  |  |  |  |  |  | (15) | (9) | (6)
Operating Loss |  |  |  |  |  |  |  |  | (15) | (9) | (6)
Equity earnings of subsidiaries |  |  |  |  |  |  |  |  | 660 | 625 | 585
Interest income |  |  |  |  |  |  |  |  | 1 | 1 | 1
Other expense |  |  |  |  |  |  |  |  | (19) | (9) | (20)
Total other income |  |  |  |  |  |  |  |  | 642 | 617 | 566
Interest on long-term debt |  |  |  |  |  |  |  |  | 150 | 134 | 150
Intercompany interest expense and other |  |  |  |  |  |  |  |  | 1 | 3 | 2
Total interest charges |  |  |  |  |  |  |  |  | 151 | 137 | 152
Income Before Income Taxes |  |  |  |  |  |  |  |  | 476 | 471 | 408
Income Tax Expense |  |  |  |  |  |  |  |  | (75) | (52) | (69)
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  | $ 551 | $ 523 | $ 477

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