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Accounts Receivable, Net Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Power receivables $ 1,401 $ 1,624
Other receivables 128 115
Allowance for uncollectible accounts [1] (1)  
Accounts receivable, net 1,529 $ 1,739
Available Credit on Public Power Support and Stabilization Program 1,000  
Subsequent Credit on Public Power Support and Stabilization Program $ 1  
[1] Allowance for uncollectible accounts was less than $1 million at September 30, 2020 and 2019, and therefore is not represented in the table above.