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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