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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details) $ in Millions | Jun. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) Bond_issues
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Number of currency swaps outstanding | Bond_issues |  | 2
Accounts Receivable, before Allowance for Credit Loss, Current | $ 1,514 | $ 1,899
Total derivatives not subject to master netting or similar arrangement | 22 | 152
Gross amounts of recognized liabilities | 1,256 | 1,160
Derivative Liability, Not Subject to Master Netting Arrangement | 11 | 7
Amount of letters of credit outstanding | 6 |
Forward Contract Derivative Asset, at Fair Value | 8 | 4
Interest Rate Contract |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts of recognized liabilities | 837 | 905
Letter of Credit |  |
Offsetting Liabilities [Line Items] |  |
Amount of letters of credit outstanding | 595 | 704
Interest Swap Collateral |  |
Offsetting Liabilities [Line Items] |  |
Amount of letters of credit outstanding | 569 |
Fair Value, Inputs, Level 2 |  |
Offsetting Liabilities [Line Items] |  |
Forward Contract Derivative Asset, at Fair Value | $ 8 | $ 4

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