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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Expenses |  |  |  |  |  |  |  |  |  |  |
Other operating expense |  |  |  |  |  |  |  |  | $ (1,417) | $ (1,236) | $ (1,248)
Total operating expenses |  |  |  |  |  |  |  |  | (5,711) | (5,245) | (5,143)
Operating Loss | $ 250 | $ 294 | $ 255 | $ 363 | $ 379 | $ 330 | $ 241 | $ 388 | 1,162 | 1,338 | 1,256
Other Income and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Nonoperating retirement benefits, net |  |  |  |  |  |  |  |  | 90 | 24 | 41
Interest income |  |  |  |  |  |  |  |  | 11 | 12 | 6
Other income |  |  |  |  |  |  |  |  | 2 | 6 | 8
Other expense |  |  |  |  |  |  |  |  | (48) | (76) | (75)
Total other income (expense) |  |  |  |  |  |  |  |  | 70 | (14) | 5
Interest Charges |  |  |  |  |  |  |  |  |  |  |
Interest on long-term debt |  |  |  |  |  |  |  |  | 412 | 406 | 411
Interest on long-term debt |  |  |  |  |  |  |  |  | 49 | 34 | 29
Total interest charges |  |  |  |  |  |  |  |  | 458 | 438 | 435
Income Before Income Taxes |  |  |  |  |  |  |  |  | 774 | 886 | 826
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 115 | 424 | 273
Net income (loss) available to common stockholders | $ 108 | $ 169 | $ 139 | $ 241 | $ (3) | $ 172 | $ 92 | $ 199 | 657 | 460 | 551
CMS Energy |  |  |  |  |  |  |  |  |  |  |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |
Other operating expense |  |  |  |  |  |  |  |  | (7) | (9) | (14)
Total operating expenses |  |  |  |  |  |  |  |  | (7) | (9) | (14)
Operating Loss |  |  |  |  |  |  |  |  | (7) | (9) | (14)
Other Income and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
Equity earnings of subsidiaries |  |  |  |  |  |  |  |  | 780 | 633 | 660
Nonoperating retirement benefits, net |  |  |  |  |  |  |  |  | (1) | (1) | (1)
Interest income |  |  |  |  |  |  |  |  | 2 | 1 | 1
Other income |  |  |  |  |  |  |  |  | 0 | 2 | 0
Other expense |  |  |  |  |  |  |  |  | 17 | 31 | 19
Total other income (expense) |  |  |  |  |  |  |  |  | 764 | 604 | 641
Interest Charges |  |  |  |  |  |  |  |  |  |  |
Interest on long-term debt |  |  |  |  |  |  |  |  | 135 | 143 | 150
Interest on long-term debt |  |  |  |  |  |  |  |  | 7 | 3 | 1
Total interest charges |  |  |  |  |  |  |  |  | 142 | 146 | 151
Income Before Income Taxes |  |  |  |  |  |  |  |  | 615 | 449 | 476
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (42) | (11) | (75)
Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  | $ 657 | $ 460 | $ 551

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