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Stock-Based Compensation (Schedule Of Restricted Stock Granted) (Details)
12 Months Ended
Dec. 31, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 503,493
Consumers Energy Company  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 478,535
Time-lapse awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 119,167
Time-lapse awards | Consumers Energy Company  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 113,627
Market-based awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 144,963
Market-based awards | Consumers Energy Company  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 137,636
Performance-based awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 144,963
Performance-based awards | Consumers Energy Company  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 137,636
Director restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 13,575
Director restricted stock units | Consumers Energy Company  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 13,005
Dividend equivalents on market-based awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 12,779
Dividend equivalents on market-based awards | Consumers Energy Company  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 12,176
Dividend equivalents on performance-based awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 15,899
Dividend equivalents on performance-based awards | Consumers Energy Company  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 15,145
Dividend equivalents on restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 1,324
Dividend equivalents on restricted stock units | Consumers Energy Company  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 1,045
Additional market-based shares based on achievement of condition  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 15,320
Additional market-based shares based on achievement of condition | Consumers Energy Company  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 14,550
Additional performance-based shares based on achievement of condition  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 35,503
Additional performance-based shares based on achievement of condition | Consumers Energy Company  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) 33,715