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Summary of Significant Accounting Policies [Table Text Block]
 12 Months Ended
Sep. 30, 2024
Accounting Policies [Abstract]  
Property, Plant, and Equipment Depreciation Rates Average depreciation rates by asset class are as follows:
Property, Plant, and Equipment Depreciation Rates
At September 30
(percent)
202420232022
Asset Class
Nuclear2.71 2.73 2.72 
Coal-fired(1)
4.13 4.98 4.27 
Hydroelectric1.83 1.82 1.85 
Gas and oil-fired3.31 3.17 3.38 
Transmission1.52 1.52 1.51 
Other4.98 4.43 3.64 
Schedule of Cash and Cash Equivalents The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported on the Consolidated Balance Sheets and Consolidated Statements of Cash Flows:
Cash, Cash Equivalents, and Restricted Cash
At September 30
(in millions)
 20242023
Cash and cash equivalents$502 $501 
Restricted cash and cash equivalents included in Other long-term assets21 20 
Total cash, cash equivalents, and restricted cash$523 $521