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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

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