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Transition Activities - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 45 Months Ended
May 31, 2023
USD ($)
MW
Jun. 30, 2023
USD ($)
coal_fueled_electric_generating_unit
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
coal_fueled_electric_generating_unit
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
coal_fueled_electric_generating_unit
Jun. 30, 2023
USD ($)
coal_fueled_electric_generating_unit
Dec. 31, 2022
USD ($)
New Covert Generating Facility | Consumers Energy Company                
Restructuring Cost and Reserve [Line Items]                
Nameplate capacity (in MW) | MW 1,200              
Consideration transferred $ 810              
Net book value of plant 440              
Plant acquisition adjustment 370              
Increase to property, plant, and equipment 810              
New Covert Generating Facility | Seller                
Restructuring Cost and Reserve [Line Items]                
Original cost of plant 665              
Accumulated depreciation $ 225              
D.E. Karn Generating Complex | Consumers Energy Company | Costs of coal-fueled electric generating units to be retired                
Restructuring Cost and Reserve [Line Items]                
Regulatory assets, number of units | coal_fueled_electric_generating_unit   2   2   2 2  
Regulatory asset   $ 670   $ 670   $ 670 $ 670  
Retention Benefits                
Restructuring Cost and Reserve [Line Items]                
Cost deferred   $ 5 $ 2 $ 10 $ 3      
Retention Benefits | D.E. Karn Generating Complex and J.H. Campbell Generating Units | Retention Incentive Program                
Restructuring Cost and Reserve [Line Items]                
Regulatory asset collection period   3 years   3 years   3 years 3 years  
Retention Benefits | D.E. Karn Generating Complex                
Restructuring Cost and Reserve [Line Items]                
Aggregate cost incurred               $ 32
Retention and severance costs             $ 16  
Retention Benefits | D.E. Karn Generating Complex | Retention Incentive Program                
Restructuring Cost and Reserve [Line Items]                
Cost deferred             12  
Retention Benefits | D.E. Karn Generating Complex | Property, Plant and Equipment                
Restructuring Cost and Reserve [Line Items]                
Costs incurred and capitalized             4  
Retention Benefits | J.H. Campbell Generating Units                
Restructuring Cost and Reserve [Line Items]                
Expected cost   $ 50   $ 50   $ 50 $ 50  
Retention Benefits | J.H. Campbell Generating Units | Retention Incentive Program                
Restructuring Cost and Reserve [Line Items]                
Cost deferred           $ 28