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Related Parties Related Parties (Tables)
12 Months Ended
Sep. 30, 2020
Related Party Transactions [Abstract]  
Related Party Transactions Transactions with agencies of the federal government were as follows:
Related Party Transactions
For the years ended, or at, September 30
 202020192018
Revenue from sales of electricity$105 $118 $122 
Other income260 258 240 
Expenditures
Operating expenses224 222 220 
Additions to property, plant, and equipment10 
Cash and cash equivalents31 45 46 
Accounts receivable, net94 76 60 
Investment funds485 279 199 
Long-term accounts receivable27 53 46 
Accounts payable and accrued liabilities39 69 69 
Long-term power bonds, net— — 
Return on power program appropriation investment