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Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held to maturity, Carrying Amount $ 10 $ 9
Securities held to maturity - Fair Value 10 10
Notes receivable, Carrying Amount 698 561
Long-term debt, Carrying Amount 7,642 [1] 7,229 [1]
Long-term debt, Fair Value 8,368 [1] 8,347 [1]
Current notes receivable 63 41
Current portion of long-term debt 541 519
Consumers Energy Company [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable, Carrying Amount 14 16
Long-term debt, Carrying Amount 4,622 [2] 4,338 [2]
Long-term debt, Fair Value 4,940 [2] 5,015 [2]
Current notes receivable 14  
Current portion of long-term debt 43 41
EnerBank [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable, Carrying Amount 683 [3] 544 [3]
Notes receivable, Fair Value 724 [3] 581 [3]
Current notes receivable 48 40
Fair Value, Inputs, Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held to maturity - Fair Value 10 10
Long-term debt, Fair Value 7,406 [1] 7,321 [1]
Fair Value, Inputs, Level 2 [Member] | Consumers Energy Company [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, Fair Value 3,978 [2] 3,989 [2]
Fair Value, Inputs, Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, Fair Value 962 [1] 1,026 [1]
Fair Value, Inputs, Level 3 [Member] | Consumers Energy Company [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, Fair Value 962 [2] 1,026 [2]
Fair Value, Inputs, Level 3 [Member] | EnerBank [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes receivable, Fair Value $ 724 [3] $ 581 [3]
[1] Includes current portion of long-term debt of $541 million at December 31, 2013 and $519 million at December 31, 2012.
[2] Includes current portion of long-term debt of $43 million at December 31, 2013 and $41 million at December 31, 2012.
[3] Includes current portion of notes receivable of $48 million at December 31, 2013 and $40 million at December 31, 2012.