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Schedule I - Condensed Financial Information of Registrant (Condensed Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
Cash and cash equivalents | $ 93 | $ 161 | $ 247 | $ 90
Notes receivable | 41 | 49 |  |
Accounts receivable, including intercompany and related parties | 10 | 10 |  |
Deferred income taxes |  | 24 |  |
Total current assets | 2,422 | 2,565 |  |
Less accumulated depreciation and amortization | 5,121 | 4,901 |  |
Investsment in subsidiaries | 57 | 50 |  |
Other | 293 | 276 |  |
Total other non-current assets | 3,158 | 3,254 |  |
Total Assets | 17,131 | 16,452 | 15,616 |
Current portion of long-term debt | 541 | 1,057 |  |
Accounts and notes payable, including intercompany and related parties | 9 | 9 |  |
Accrued interest, including intercompany | 95 | 101 |  |
Accrued taxes | 279 | 282 |  |
Other liabilities current | 152 | 159 |  |
Total current liabilities | 1,797 | 2,338 |  |
Long-term debt | 6,710 | 6,040 |  |
Unamortized Discount | 16 | 20 |  |
Postretirement benefits | 1,451 | 1,289 |  |
Other non-current liabilities | 311 | 336 |  |
Total non-current liabilities | 12,096 | 11,042 |  |
Common stockholders' equity | 3,194 | 3,028 |  |
Total Liabilities and Equity | 17,131 | 16,452 |  |
CMS Energy [Member] |  |  |  |
Cash and cash equivalents | 2 |  |  |
Notes receivable | 1 | 1 |  |
Accounts receivable, including intercompany and related parties | 4 | 6 |  |
Accrued taxes | 7 | 16 |  |
Deferred income taxes | 3 | 3 |  |
Total current assets | 17 | 26 |  |
Plant, property, and equipment, gross | 16 | 16 |  |
Less accumulated depreciation and amortization | 16 | 16 |  |
Deferred income taxes | 392 | 367 |  |
Investsment in subsidiaries | 5,312 | 5,096 |  |
Other investments - DB SERP | 24 | 23 |  |
Other | 26 | 28 |  |
Total other non-current assets | 5,754 | 5,514 |  |
Total Assets | 5,771 | 5,540 |  |
Current portion of long-term debt | 172 | 398 |  |
Accounts and notes payable, including intercompany and related parties | 152 | 163 |  |
Accrued interest, including intercompany | 30 | 28 |  |
Other liabilities current | 5 | 5 |  |
Total current liabilities | 359 | 594 |  |
Long-term debt | 2,205 | 1,875 |  |
Notes payable - related party |  | 34 |  |
Unamortized Discount | (13) | (17) |  |
Postretirement benefits | 24 | 24 |  |
Other non-current liabilities | 2 | 2 |  |
Total non-current liabilities | 2,218 | 1,918 |  |
Common stockholders' equity | 3,194 | 3,028 |  |
Total Liabilities and Equity | $ 5,771 | $ 5,540 |  |

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