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Related Parties Related Parties (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Related Parties      
Revenue from sales of electricity $ 12,054 $ 12,540 $ 10,503
Long-term Investments 4,123 3,671  
Return on power program appropriation investment (6) (4) (4)
Related Party Transactions      
Related Parties      
Revenue from sales of electricity 120 134 109
Other income 282 296 280
Operating expenses 234 228 214
Additions to property, plant, and equipment 8 11 10
Cash and cash equivalents 31 30 30
Receivables from Customers 87 78 65
Long-term Investments 391 358 573
Receivables, Long-term Contracts or Programs 38 43 31
Accounts payable and accrued liabilities 42 42 15
Long-term power bonds, net 1 1 1
Return on power program appropriation investment $ (6) $ (4) $ (4)