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Financings And Capitalization (Contingently Convertible Securities) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
CMS Energy [Member]
Dec. 31, 2011
CMS Energy [Member]
Dec. 31, 2012
Senior Notes 5.5% Due June 2029 [Member]
Dec. 31, 2012
2.875% Convertible Senior Notes Due 2024 [Member]
Dec. 31, 2012
2.875% Convertible Senior Notes Due 2024 [Member]
January Conversion [Member]
Dec. 31, 2012
2.875% Convertible Senior Notes Due 2024 [Member]
April Conversion [Member]
Maturity Date     2029 2024    
Outstanding     $ 172,000,000      
Adjusted Conversion Price     $ 13.94      
Adjusted Trigger Price     $ 18.12      
Number of trading days, adjusted trigger price contingencies were met     20 days      
Number of trading days     30 days      
Trigger Price As Percent Of Conversion Price     130.00%      
Senior Notes Interest Rate     5.50% 2.875%    
Conversion Date         January 2012 April 2012
Principal Converted         73,000,000 153,000,000
Conversion Value per share of principal         1,738.99 1,774.98
Debt issuance, principal 2,377,000,000 2,273,000,000        
Common Stock Issued on Settlement         2,464,138 5,381,349
Cash Paid on Settlement         $ 73,000,000 $ 153,000,000