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Schedule I - Condensed Financial Information of Registrant (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cash Flows from Operating Activities |  |  |
Net cash provided by operating activities | $ 2,370 | $ 2,309 | $ 855
Cash Flows from Investing Activities |  |  |
Net cash used in investing activities | (3,054) | (3,386) | (2,476)
Cash Flows from Financing Activities |  |  |
Proceeds from issuance of debt | 1,962 | 3,551 | 1,899
Issuance of common stock | 286 | 192 | 69
Retirement of long-term debt | (952) | (2,132) | (106)
Increase (decrease) in notes payable | (28) | 73 | 20
Net cash provided by financing activities | 614 | 1,143 | 1,327
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts | (70) | 66 | (294)
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period | 248 | 182 | 476
Cash and Cash Equivalents, Including Restricted Amounts, End of Period | 178 | 248 | 182
Capital Expenditures |  |  |
Cash Flows from Investing Activities |  |  |
Capital expenditures | (3,018) | (2,407) | (2,374)
CMS Energy |  |  |
Cash Flows from Operating Activities |  |  |
Net cash provided by operating activities | 774 | 595 | 565
Cash Flows from Investing Activities |  |  |
Investment in subsidiaries | (535) | (630) | (796)
Net cash used in investing activities | (803) | (868) | (510)
Cash Flows from Financing Activities |  |  |
Proceeds from issuance of debt | 490 | 800 | 0
Issuance of common stock | 286 | 192 | 69
Retirement of long-term debt | (250) | 0 | 0
Payment of dividends on common and preferred stock | (626) | (579) | (544)
Debt issuance costs and financing fees | (10) | (20) | (11)
Net cash provided by financing activities | (116) | 386 | (409)
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts | (145) | 113 | (354)
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period | 149 | 36 | 390
Cash and Cash Equivalents, Including Restricted Amounts, End of Period | 4 | 149 | 36
CMS Energy | Capital Expenditures |  |  |
Cash Flows from Investing Activities |  |  |
Capital expenditures | (1) | 0 | 0
CMS Energy | Related Party |  |  |
Cash Flows from Investing Activities |  |  |
Investment in debt securities – intercompany | (288) | (293) | 0
Decrease (increase) in notes receivable – intercompany | 21 | 55 | 286
Cash Flows from Financing Activities |  |  |
Increase (decrease) in notes payable | $ (6) | $ (7) | $ 77

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