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Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Sep. 30, 2020
Accounts Receivable, Net    
Accounts Receivable, before Allowance for Credit Loss, Current $ 1,204 $ 1,401
Other receivables 80 128
Allowance for uncollectible accounts 1  
Accounts receivable, net 1,284 $ 1,529
Total available Credit on the Public Power Support and Stabilization Program 1,000  
Subsequent Credit on the Public Power Support and Stabilization Program $ 1