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Accounts Receivable, Net Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Power receivables $ 1,899 $ 1,480
Other receivables 108 86
Allowance for uncollectible accounts (1) [1] (1)
Accounts receivable, net $ 2,007 $ 1,566
[1] Allowance for uncollectible accounts was less than $1 million at both September 30, 2022 and 2021, and therefore is not represented in the table above.