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Related Parties Related Parties (Tables)
12 Months Ended
Sep. 30, 2022
Related Party Transactions [Abstract]  
Related Party Transactions Transactions with agencies of the federal government were as follows:
Related Party Transactions
At or for the years ended September 30
(in millions)
 202220212020
Revenue from sales of electricity$134 $109 $105 
Other income296 280 260 
Expenditures
Operating expenses228 214 224 
Additions to property, plant, and equipment11 10 
Cash and cash equivalents30 30 31 
Accounts receivable, net78 65 94 
Investment funds358 573 485 
Long-term accounts receivable43 31 27 
Accounts payable and accrued liabilities42 15 39 
Long-term power bonds, net
Return on power program appropriation investment