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Schedule I - Condensed Financial Information of Registrant (Condensed Balance Sheets) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Current Assets |  |  |
Cash and cash equivalents | $ 227 | $ 164 |
Prepayments and other current assets | 80 | 113 |
Total current assets | 2,839 | 3,433 |
Other Non‑current Assets |  |  |
Investments in subsidiaries | 76 | 71 | $ 71
Other | 357 | 310 |
Total other non‑current assets | 5,606 | 5,207 |
Total Assets | 33,517 | 31,353 | $ 28,753
Current Liabilities |  |  |
Current portion of long-term debt | 975 | 1,090 |
Accrued interest, including intercompany | 142 | 122 |
Accrued taxes | 612 | 538 |
Other current liabilities | 149 | 166 |
Total current liabilities | 2,895 | 2,985 |
Non‑current Liabilities |  |  |
Long-term debt | 14,508 | 13,122 |
Postretirement benefits | 106 | 108 |
Other non‑current liabilities | 415 | 397 |
Total non‑current liabilities | 22,497 | 20,773 |
Equity |  |  |
Common stock | 3 | 3 |
Total common stockholders’ equity | 7,320 | 6,791 |
Preferred stock | 224 | 224 |
Total stockholders’ equity | 7,544 | 7,015 |
Total Liabilities and Equity | 33,517 | 31,353 |
CMS Energy |  |  |
Current Assets |  |  |
Cash and cash equivalents | 149 | 36 |
Taxes receivable | 11 | 45 |
Prepayments and other current assets | 0 | 1 |
Total current assets | 229 | 197 |
Other Non‑current Assets |  |  |
Deferred income taxes | 137 | 105 |
Other investments | 8 | 6 |
Other | 24 | 11 |
Total other non‑current assets | 12,166 | 11,003 |
Total Assets | 12,395 | 11,200 |
Current Liabilities |  |  |
Current portion of long-term debt | 250 | 0 |
Accrued interest, including intercompany | 37 | 33 |
Other current liabilities | 9 | 9 |
Total current liabilities | 371 | 116 |
Non‑current Liabilities |  |  |
Long-term debt | 4,471 | 3,930 |
Notes payable – intercompany | 105 | 109 |
Postretirement benefits | 15 | 15 |
Other non‑current liabilities | 18 | 15 |
Total non‑current liabilities | 4,609 | 4,069 |
Equity |  |  |
Common stock | 3 | 3 |
Other stockholders' equity | 7,188 | 6,788 |
Total common stockholders’ equity | 7,191 | 6,791 |
Preferred stock | 224 | 224 |
Total stockholders’ equity | 7,415 | 7,015 |
Total Liabilities and Equity | 12,395 | 11,200 |
CMS Energy | Intercompany |  |  |
Current Assets |  |  |
Notes and accrued interest receivable – intercompany | 60 | 107 |
Other Non‑current Assets |  |  |
Investments in subsidiaries | 11,701 | 10,881 |
Investment in debt securities – intercompany | 296 | 0 |
Current Liabilities |  |  |
Accounts and notes payable – intercompany | 75 | 74 |
CMS Energy | Intercompany and related parties |  |  |
Current Assets |  |  |
Accounts receivable – intercompany and related parties | $ 9 | $ 8 |

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