v3.26.1
Property, Plant and Equipment, Net - MEC (Details) - MEC - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Property, Plant and Equipment [Line Items]      
Plant, net $ 22,597   $ 22,733
Construction work-in-progress 1,502   1,323
Property, plant and equipment, net 24,099   24,056
Anticipated equity returns exceeding threshold      
Property, Plant and Equipment [Line Items]      
Regulatory liability, additions 10 $ 61  
Regulated      
Property, Plant and Equipment [Line Items]      
Generation 18,677   18,804
Transmission 3,310   3,297
Utility plant in-service 30,997   31,027
Accumulated depreciation and amortization (8,410)   (8,304)
Plant, net $ 22,587   22,723
Regulated | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life, generation 20 years    
Useful life, transmission 55 years    
Regulated | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life, generation 62 years    
Useful life, transmission 80 years    
Nonregulated      
Property, Plant and Equipment [Line Items]      
Plant, net $ 10   10
Nonregulated | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life, other 20 years    
Nonregulated | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life, other 50 years    
Electricity | Regulated      
Property, Plant and Equipment [Line Items]      
Distribution $ 6,395   6,326
Electricity | Regulated | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life, distribution 15 years    
Electricity | Regulated | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life, distribution 80 years    
Natural gas | Regulated      
Property, Plant and Equipment [Line Items]      
Distribution $ 2,615   $ 2,600
Natural gas | Regulated | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life, distribution 30 years    
Natural gas | Regulated | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life, distribution 75 years