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Related Parties Related Parties (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Related Parties      
Revenue from sales of electricity $ 12,540 $ 10,503 $ 10,249
Other income 0 (28) 0
Long-term Investments 3,671 4,053  
Return on power program appropriation investment (4) (4) (6)
Related Party Transactions      
Related Parties      
Revenue from sales of electricity 134 109 105
Other income 296 280 260
Operating expenses 228 214 224
Additions to property, plant, and equipment 11 10 9
Cash and cash equivalents 30 30 31
Receivables from Customers 78 65 94
Long-term Investments 358 573 485
Receivables, Long-term Contracts or Programs 43 31 27
Accounts payable and accrued liabilities 42 15 39
Long-term power bonds, net 1 1 1
Return on power program appropriation investment $ (4) $ (4) $ (6)