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Schedule I - Condensed Financial Information of Registrant (Condensed Balance Sheets) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Current Assets |  |  |
Notes and accrued interest receivable | $ 233 | $ 198 |
Accounts receivable - intercompany and related parties | 14 | 12 |
Prepayments and other current assets | 101 | 83 |
Total current assets | 2,468 | 2,475 |
Other Non-current Assets |  |  |
Other | 478 | 799 |
Total other non-current assets | 3,935 | 3,814 |
Total Assets | 24,529 | 23,050 | $ 21,622
Current Liabilities |  |  |
Current portion of long-term debt | 996 | 1,103 |
Accounts and notes payable - intercompany | 10 | 15 |
Accrued interest, including intercompany | 94 | 103 |
Other current liabilities | 147 | 195 |
Total current liabilities | 2,624 | 2,784 |
Non-current Liabilities |  |  |
Long-term debt | 10,615 | 9,123 |
Postretirement benefits | 436 | 766 |
Other non-current liabilities | 294 | 307 |
Total non-current liabilities | 17,113 | 15,788 |
Equity |  |  |
Common stockholders’ equity | 4,755 | 4,441 |
Total Liabilities and Equity | 24,529 | 23,050 |
CMS Energy |  |  |
Current Assets |  |  |
Notes and accrued interest receivable | 2 | 5 |
Accounts receivable - intercompany and related parties | 7 | 7 |
Federal income tax receivable | 44 | 77 |
Accrued taxes | 26 | 57 |
Prepayments and other current assets | 1 | 1 |
Total current assets | 80 | 147 |
Other Non-current Assets |  |  |
Deferred income taxes | 180 | 269 |
Investments in subsidiaries | 7,706 | 7,202 |
Other investments – DB SERP | 3 | 25 |
Other | 10 | 2 |
Total other non-current assets | 7,899 | 7,498 |
Total Assets | 7,979 | 7,645 |
Current Liabilities |  |  |
Current portion of long-term debt | 180 | 225 |
Accounts and notes payable - intercompany | 113 | 87 |
Accrued interest, including intercompany | 32 | 34 |
Other current liabilities | 7 | 5 |
Total current liabilities | 332 | 351 |
Non-current Liabilities |  |  |
Long-term debt | 2,750 | 2,830 |
Notes payable - intercompany | 116 | 0 |
Postretirement benefits | 17 | 21 |
Other non-current liabilities | 9 | 2 |
Total non-current liabilities | 2,892 | 2,853 |
Equity |  |  |
Total Liabilities and Equity | $ 7,979 | $ 7,645 |

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Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |