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Summary of Significant Accounting Policies Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Prior Period Reclassification Adjustment | $ 65 | $ 13 | $ 128 |
Accounts Payable and Other Accrued Liabilities | 12 | 12 |  |
Other Operating Income (Expense), Net | (5) |  |  |
Deferred Costs | 39 | 39 |  |
Fuel cost tax equivalents | (6) |  |  |
Financing Receivable, Net | 136 | 136 |  | $ 123
Allowance for Notes, Loans and Financing Receivable, Noncurrent | 1 | 1 |  |
Other Deferred Costs, Net | 19 | 19 |  |
Other Depreciation and Amortization | 26 |  |  |
Other Operating Activities, Cash Flow Statement | (17) |  |  |
Carrying Value |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Net | $ 151 | $ 151 |  | $ 138

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