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Accounts Receivable, Net Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Power receivables $ 1,627 $ 1,899
Other receivables 118 108
Allowance for uncollectible accounts (1) [1] (1)
Accounts receivable, net $ 1,745 $ 2,007
[1] Allowance for uncollectible accounts was less than $1 million at both September 30, 2023 and 2022, and therefore is not represented in the table above.