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Accounts Receivable, Net (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Sep. 30, 2020
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Accounts Receivable, Net |  |
Accounts Receivable, before Allowance for Credit Loss, Current | $ 1,373 | $ 1,401
Other receivables | 95 | 128
Allowance for uncollectible accounts | 1 |
Accounts receivable, net | 1,468 | $ 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 |

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