v3.25.4
Plant, Property, and Equipment (Schedule of Property, Plant and Equipment) (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Sep. 30, 2025
facility
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Public Utility, Property, Plant and Equipment [Line Items]        
Plant, property, and equipment, gross   $ 37,763 $ 34,932  
Assets under finance leases   193 176 $ 136
Construction work in progress   3,052 2,098  
Accumulated depreciation and amortization   (10,135) (9,569)  
Total plant, property, and equipment   30,680 27,461  
Facilities agreed to sell | facility 13      
Consumers Energy Company        
Public Utility, Property, Plant and Equipment [Line Items]        
Plant, property, and equipment, gross   36,120 33,434  
Assets under finance leases   138 131 $ 112
Construction work in progress   2,354 1,766  
Accumulated depreciation and amortization   (9,842) (9,310)  
Total plant, property, and equipment   28,632 25,890  
Plant additions   3,100 2,100  
Plant retirements   387 390  
Impairment of assets   20    
Consumers Energy Company | Renewable Natural Gas Development Projects        
Public Utility, Property, Plant and Equipment [Line Items]        
Impairment of assets   $ 15    
Consumers Energy Company | Minimum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, consumers   3 years    
Consumers Energy Company | Maximum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, consumers   125 years    
Generation | Consumers Energy Company        
Public Utility, Property, Plant and Equipment [Line Items]        
Generation   $ 7,171 6,576  
Generation | Consumers Energy Company | Minimum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, generation   15 years    
Generation | Consumers Energy Company | Maximum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, generation   125 years    
Distribution | Consumers Energy Company        
Public Utility, Property, Plant and Equipment [Line Items]        
Distribution   $ 13,360 12,135  
Distribution | Consumers Energy Company | Minimum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, distribution   15 years    
Distribution | Consumers Energy Company | Maximum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, distribution   75 years    
Other | Consumers Energy Company        
Public Utility, Property, Plant and Equipment [Line Items]        
Other   $ 1,209 1,307  
Other | Consumers Energy Company | Minimum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, other   5 years    
Other | Consumers Energy Company | Maximum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, other   55 years    
Assets under finance leases | Consumers Energy Company        
Public Utility, Property, Plant and Equipment [Line Items]        
Assets under finance leases   $ 131 119  
Distribution | Consumers Energy Company        
Public Utility, Property, Plant and Equipment [Line Items]        
Distribution   $ 8,553 7,942  
Distribution | Consumers Energy Company | Minimum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, distribution   20 years    
Distribution | Consumers Energy Company | Maximum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, distribution   85 years    
Transmission | Consumers Energy Company        
Public Utility, Property, Plant and Equipment [Line Items]        
Transmission   $ 3,236 3,081  
Transmission | Consumers Energy Company | Minimum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, transmission   17 years    
Transmission | Consumers Energy Company | Maximum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, transmission   75 years    
Underground storage facilities | Consumers Energy Company        
Public Utility, Property, Plant and Equipment [Line Items]        
Other   $ 1,535 1,405  
Underground storage facilities | Consumers Energy Company | Minimum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, other   29 years    
Underground storage facilities | Consumers Energy Company | Maximum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, other   75 years    
Other | Consumers Energy Company        
Public Utility, Property, Plant and Equipment [Line Items]        
Other   $ 886 828  
Other | Consumers Energy Company | Minimum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, other   5 years    
Other | Consumers Energy Company | Maximum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, other   55 years    
Finance leases | Consumers Energy Company        
Public Utility, Property, Plant and Equipment [Line Items]        
Assets under finance leases   $ 8 12  
Other non-utility property | Consumers Energy Company        
Public Utility, Property, Plant and Equipment [Line Items]        
Other non-utility property   $ 31 29  
Other non-utility property | Consumers Energy Company | Minimum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, other   3 years    
Other non-utility property | Consumers Energy Company | Maximum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, other   51 years    
Natural Gas | Underground storage facilities | Consumers Energy Company        
Public Utility, Property, Plant and Equipment [Line Items]        
Other   $ 24 26  
NorthStar Clean Energy        
Public Utility, Property, Plant and Equipment [Line Items]        
Assets under finance leases   55 45  
Independent power production        
Public Utility, Property, Plant and Equipment [Line Items]        
Plant, property, and equipment, gross   $ 1,585 1,452  
Independent power production | Minimum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, Enterprises   3 years    
Independent power production | Maximum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, Enterprises   40 years    
Other        
Public Utility, Property, Plant and Equipment [Line Items]        
Plant, property, and equipment, gross   $ 3 $ 1  
Other | Minimum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, Enterprises   3 years    
Other | Maximum        
Public Utility, Property, Plant and Equipment [Line Items]        
Estimated depreciable life in years, Enterprises   5 years