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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Expenses                      
Other operating expense                 $ (1,448) $ (1,417) $ (1,236)
Total operating expenses                 (5,606) (5,711) (5,245)
Operating Loss $ 311 $ 351 $ 218 $ 359 $ 250 $ 294 $ 255 $ 363 1,239 1,162 1,338
Other Income and Expenses [Abstract]                      
Nonoperating retirement benefits, net                 91 90 24
Interest income                 7 11 12
Other income                 4 2 6
Other expense                 (13) (48) (76)
Total other income (expense)                 109 70 (14)
Interest Charges                      
Interest on long-term debt                 439 412 406
Interest on long-term debt                 75 49 34
Total interest charges                 519 458 438
Income Before Income Taxes                 829 774 886
Income tax expense (benefit)                 147 115 424
Net income (loss) available to common stockholders $ 167 $ 207 $ 93 $ 213 $ 108 $ 169 $ 139 $ 241 680 657 460
CMS Energy                      
Operating Expenses                      
Other operating expense                 (38) (7) (9)
Total operating expenses                 (38) (7) (9)
Operating Loss                 (38) (7) (9)
Other Income and Expenses [Abstract]                      
Equity earnings of subsidiaries                 826 780 633
Nonoperating retirement benefits, net                 (1) (1) (1)
Interest income                 1 2 1
Other income                 1 0 2
Other expense                 0 17 31
Total other income (expense)                 827 764 604
Interest Charges                      
Interest on long-term debt                 156 135 143
Interest on long-term debt                 10 7 3
Total interest charges                 166 142 146
Income Before Income Taxes                 623 615 449
Income tax expense (benefit)                 (57) (42) (11)
Net income (loss) available to common stockholders                 $ 680 $ 657 $ 460