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Summary of Significant Accounting Policies (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Nuclear Plant    
Property, Plant and Equipment [Line Items]    
Public utilities, property, plant and equipment, disclosure of composite depreciation rate for plants of service 2.72% 2.38%
Fossil Fuel Plant    
Property, Plant and Equipment [Line Items]    
Public utilities, property, plant and equipment, disclosure of composite depreciation rate for plants of service 3.98% 1.95%
Hydro Plant    
Property, Plant and Equipment [Line Items]    
Public utilities, property, plant and equipment, disclosure of composite depreciation rate for plants of service 1.95% 1.60%
Natural Gas Processing Plant    
Property, Plant and Equipment [Line Items]    
Public utilities, property, plant and equipment, disclosure of composite depreciation rate for plants of service 3.45% 2.98%
Electric Transmission    
Property, Plant and Equipment [Line Items]    
Public utilities, property, plant and equipment, disclosure of composite depreciation rate for plants of service 1.45% 1.34%
Other Plant in Service    
Property, Plant and Equipment [Line Items]    
Public utilities, property, plant and equipment, disclosure of composite depreciation rate for plants of service 3.21% 7.12%