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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details) $ in Millions | Mar. 31, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 Bond_issues
--- | --- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Number of currency swaps outstanding | Bond_issues |  |  | 2
Accounts Receivable, before Allowance for Credit Loss, Current | $ 1,277 | $ 1,480 |
Total derivatives not subject to master netting or similar arrangement | 209 | 250 |
Gross amounts of recognized liabilities | 1,468 | 1,725 |
Derivative Liability, Not Subject to Master Netting Arrangement | 7 | 3 |
Forward Contract Derivative Asset, at Fair Value | 2 | 2 |
Currency Swap |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities | 93 | 83 |
Interest Rate Contract |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities | 1,368 | 1,639 |
Letter of Credit |  |  |
Offsetting Liabilities [Line Items] |  |  |
Amount of letters of credit outstanding | 1,017 | 1,200 |
Fair Value, Inputs, Level 2 |  |  |
Offsetting Liabilities [Line Items] |  |  |
Forward Contract Derivative Asset, at Fair Value | $ 2 | $ 2 |

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