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Summary of Significant Accounting Policies Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Past Due | $ 125 |  | $ 125 |  |
Defined Benefit Plan, Other Cost (Credit) | 65 | $ 65 | 194 | $ 193 |
Prior Period Reclassification Adjustment |  |  | 13 |  |
Accounts Payable and Other Accrued Liabilities | 12 |  | 12 |  |
Other Operating Income (Expense), Net | (8) |  |  |  |
Deferred Costs | 6 |  | 6 |  |
Fuel cost tax equivalents | (8) |  |  |  |
Financing Receivable, after Allowance for Credit Loss | 111 |  | 111 |  | $ 123
Other Deferred Costs, Net | 29 |  | 29 |  |
Other Depreciation and Amortization | 15 |  |  |  |
Other Operating Activities, Cash Flow Statement | (20) |  |  |  |
Carrying Value |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 125 |  | $ 125 |  | $ 138

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