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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details) $ in Millions | Mar. 31, 2023 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 Bond_issues
--- | --- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Number of currency swaps outstanding | Bond_issues |  |  | 2
Accounts Receivable, before Allowance for Credit Loss, Current | $ 1,420 | $ 1,899 |
Total derivatives not subject to master netting or similar arrangement | 25 | 152 |
Gross amounts of recognized liabilities | 1,412 | 1,160 |
Derivative Liability, Not Subject to Master Netting Arrangement | 16 | 7 |
Amount of letters of credit outstanding | 6 |  |
Forward Contract Derivative Asset, at Fair Value | 10 | 4 |
Interest Rate Contract |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities | 951 | 905 |
Letter of Credit |  |  |
Offsetting Liabilities [Line Items] |  |  |
Amount of letters of credit outstanding | 569 | 704 |
Interest Swap Collateral |  |  |
Offsetting Liabilities [Line Items] |  |  |
Amount of letters of credit outstanding | 563 |  |
Fair Value, Inputs, Level 2 |  |  |
Offsetting Liabilities [Line Items] |  |  |
Forward Contract Derivative Asset, at Fair Value | $ 10 | $ 4 |

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