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Schedule I - Condensed Financial Information of Registrant (Condensed Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008
--- | --- | --- | --- | ---
Notes receivable | $ 49 |  | $ 70 |  |  |  |
Accounts receivable - related parties | 10 |  | 10 |  |  |  |
Deferred income taxes | 24 |  | 0 |  |  |  |
Total current assets | 2,565 |  | 2,759 |  |  |  |
Less accumulated depreciation and amortization | 4,901 |  | 4,646 |  |  |  |
Investsment in subsidiaries | 50 |  | 49 |  |  |  |
Other | 276 |  | 245 |  |  |  |
Total other non-current assets | 3,254 |  | 2,788 |  |  |  |
Total Assets | 16,452 | [1] | 15,616 | [1] | 15,256 | [1] |
Current portion of long-term debt | 1,057 |  | 750 |  |  |  |
Accounts payable - related parties | 9 |  | 9 |  |  |  |
Accrued interest | 101 |  | 102 |  |  |  |
Accrued taxes | 282 |  | 302 |  |  |  |
Other liabilities current | 159 |  | 144 |  |  |  |
Total current liabilities | 2,338 |  | 2,021 |  |  |  |
Long-term debt | 6,040 |  | 6,448 |  |  |  |
Unamortized Discount | (20) |  | (32) |  |  |  |
Postretirement benefits | 1,289 |  | 1,135 |  |  |  |
Other non-current liabilities | 336 |  | 267 |  |  |  |
Total non-current liabilities | 11,042 |  | 10,758 |  |  |  |
Common stockholders' equity | 3,028 |  | 2,793 |  |  |  |
Total equity | 3,072 |  | 2,837 |  | 2,938 |  | 2,815
Total Liabilities and Equity | 16,452 |  | 15,616 |  |  |  |
CMS Energy Corporation [Member] |  |  |  |  |  |  |
Notes receivable | 1 |  | 1 |  |  |  |
Accounts receivable - related parties | 6 |  | 5 |  |  |  |
Accrued taxes | 16 |  |  |  |  |  |
Deferred income taxes | 3 |  | 13 |  |  |  |
Total current assets | 26 |  | 19 |  |  |  |
Plant, Property, and Equipment, at cost | 16 |  | 16 |  |  |  |
Less accumulated depreciation and amortization | (16) |  | (16) |  |  |  |
Deferred income taxes | 367 |  | 372 |  |  |  |
Investsment in subsidiaries | 5,096 |  | 4,941 |  |  |  |
Other investment - SERP | 23 |  | 19 |  |  |  |
Other | 28 |  | 27 |  |  |  |
Total other non-current assets | 5,514 |  | 5,359 |  |  |  |
Total Assets | 5,540 |  | 5,378 |  |  |  |
Current portion of long-term debt | 398 |  | 437 |  |  |  |
Accounts payable - related parties | 163 |  | 156 |  |  |  |
Accrued interest | 28 |  | 27 |  |  |  |
Accrued taxes |  |  | 81 |  |  |  |
Other liabilities current | 5 |  | 5 |  |  |  |
Total current liabilities | 594 |  | 706 |  |  |  |
Long-term debt | 1,875 |  | 1,848 |  |  |  |
Related Party | 34 |  | 34 |  |  |  |
Unamortized Discount | (17) |  | (28) |  |  |  |
Postretirement benefits | 24 |  | 23 |  |  |  |
Other non-current liabilities | 2 |  | 2 |  |  |  |
Total non-current liabilities | 1,918 |  | 1,879 |  |  |  |
Common stockholders' equity | 3,028 |  | 2,793 |  |  |  |
Total Liabilities and Equity | $ 5,540 |  | $ 5,378 |  |  |  |
[1] | Amounts include a portion of Consumers' other common assets attributable to both the electric and gas utility businesses.

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