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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details) $ in Millions | Mar. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 Bond_issues
--- | --- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Number of currency swaps outstanding | Bond_issues |  |  | 2
Accounts Receivable, before Allowance for Credit Loss, Current | $ 1,379 | $ 1,627 |
Amount of letters of credit outstanding | 6 |  |
Forward Contract Derivative Asset, at Fair Value | 5 | 11 |
Letter of Credit |  |  |
Offsetting Liabilities [Line Items] |  |  |
Amount of letters of credit outstanding | 516 | 535 |
Interest Swap Collateral |  |  |
Offsetting Liabilities [Line Items] |  |  |
Amount of letters of credit outstanding | 485 |  |
Fair Value, Inputs, Level 2 |  |  |
Offsetting Liabilities [Line Items] |  |  |
Forward Contract Derivative Asset, at Fair Value | $ 5 | $ 11 |

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