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Schedule I - Condensed Financial Information of Registrant (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash Flows from Operating Activities |  |  |
Net cash provided by operating activities | $ 2,309 | $ 855 | $ 1,819
Cash Flows from Investing Activities |  |  |
Net cash used in investing activities | (3,386) | (2,476) | (1,233)
Cash Flows from Financing Activities |  |  |
Proceeds from issuance of debt | 3,551 | 1,899 | 335
Issuance of common stock | 192 | 69 | 26
Issuance of preferred stock, net of issuance costs | 0 | 0 | 224
Retirement of long-term debt | (2,132) | (106) | (235)
Change in notes payable – intercompany | 73 | 20 | 0
Net cash provided by (used in) financing activities | 1,143 | 1,327 | (295)
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts | 66 | (294) | 291
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period | 182 | 476 | 185
Cash and Cash Equivalents, Including Restricted Amounts, End of Period | 248 | 182 | 476
CMS Energy |  |  |
Cash Flows from Operating Activities |  |  |
Net cash provided by operating activities | 595 | 565 | 1,549
Cash Flows from Investing Activities |  |  |
Investment in subsidiaries | (630) | (796) | (581)
Net cash used in investing activities | (868) | (510) | (664)
Cash Flows from Financing Activities |  |  |
Proceeds from issuance of debt | 800 | 0 | 0
Issuance of common stock | 192 | 69 | 26
Issuance of preferred stock, net of issuance costs | 0 | 0 | 224
Retirement of long-term debt | 0 | 0 | (200)
Payment of dividends on common and preferred stock | (579) | (544) | (507)
Debt issuance costs and financing fees | (20) | (11) | (10)
Net cash provided by (used in) financing activities | 386 | (409) | (495)
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts | 113 | (354) | 390
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period | 36 | 390 | 0
Cash and Cash Equivalents, Including Restricted Amounts, End of Period | 149 | 36 | 390
CMS Energy | Related Party |  |  |
Cash Flows from Investing Activities |  |  |
Investment in debt securities - intercompany | 293 | 0 | 0
Decrease (increase) in notes receivable – intercompany | (55) | 286 | (83)
Cash Flows from Financing Activities |  |  |
Change in notes payable – intercompany | $ (7) | $ 77 | $ (28)

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