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Schedule I - Condensed Financial Information of Registrant (Condensed Statements of Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating Expenses |  |  |
Other operating expenses | $ (1,687) | $ (1,669) | $ (1,610)
Total operating expenses | (6,227) | (7,372) | (6,183)
Operating income | 1,235 | 1,224 | 1,146
Other Income (Expense) |  |  |
Equity earnings of subsidiaries | 7 | 3 | 10
Non-operating retirement benefits, net | 180 | 205 | 165
Other income | 195 | 19 | 30
Other expense | (13) | (27) | (18)
Total other income | 362 | 197 | 177
Interest Charges |  |  |
Interest on long-term debt | 616 | 509 | 481
Total interest charges | 643 | 519 | 500
Income Before Income Taxes | 954 | 902 | 823
Income tax expense (benefit) | 147 | 93 | 95
Income From Continuing Operations | 807 | 809 | 728
Income from discontinued operations, net of tax | 1 | 4 | 602
Net Income Attributable to CMS Energy | 887 | 837 | 1,353
Preferred Stock Dividends | 10 | 10 | 5
Net Income Available to Common Stockholders | 877 | 827 | 1,348
Related Party |  |  |
Interest Charges |  |  |
Intercompany interest expense and other | 12 | 12 | 12
CMS Energy |  |  |
Operating Expenses |  |  |
Other operating expenses | 10 | 7 | 7
Total operating expenses | 10 | 7 | 7
Operating income | (10) | (7) | (7)
Other Income (Expense) |  |  |
Non-operating retirement benefits, net | (1) | (1) | (1)
Other income | 31 | 5 | 2
Other expense | 0 | (1) | 0
Total other income | 959 | 983 | 1,483
Interest Charges |  |  |
Interest on long-term debt | 201 | 181 | 183
Total interest charges | 211 | 189 | 190
Income Before Income Taxes | 738 | 787 | 1,286
Income tax expense (benefit) | (20) | (50) | (60)
Income From Continuing Operations | 758 | 837 | 1,346
Income from discontinued operations, net of tax | 0 | 0 | 7
Net Income Attributable to CMS Energy | 758 | 837 | 1,353
Preferred Stock Dividends | 10 | 10 | 5
Net Income Available to Common Stockholders | 748 | 827 | 1,348
CMS Energy | Related Party |  |  |
Other Income (Expense) |  |  |
Equity earnings of subsidiaries | 929 | 980 | 1,482
Interest Charges |  |  |
Intercompany interest expense and other | $ 10 | $ 8 | $ 7

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