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Stock-Based Compensation (Schedule Of Compensation Cost For Share-Based Payment Arrangements, Allocation Of Share-Based Compensation Costs By Plan) (Details) (Restricted Stock [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value $ 10 $ 10 $ 7
Allocated Share-based Compensation Expense 14 12 10
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 5 5 4
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 10    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 9 months 18 days    
Consumers Energy Company [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value 9 8 7
Allocated Share-based Compensation Expense 14 11 10
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 5 4 4
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 10    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 9 months 18 days