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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