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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details) $ in Millions | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) Bond_issues
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Number of currency swaps outstanding | Bond_issues |  | 3
Accounts Receivable, before Allowance for Credit Loss, Current | $ 1,286 | $ 1,624
Total derivatives not subject to master netting or similar arrangement | 10 | 12
Gross amounts of recognized liabilities | 2,372 | 1,972
Derivative Liability, Not Subject to Master Netting Arrangement | 40 | 53
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement | 2,412 | 2,025
Forward Contract Derivative Asset, at Fair Value | 11 | 22
Currency Swap |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts of recognized liabilities | 264 | 208
Interest Rate Contract |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts of recognized liabilities | 2,108 | 1,764
Letter of Credit |  |
Offsetting Liabilities [Line Items] |  |
Amount of letters of credit outstanding | 1,510 | 1,300
Fair Value, Inputs, Level 2 |  |
Offsetting Liabilities [Line Items] |  |
Forward Contract Derivative Asset, at Fair Value | $ 11 | $ 22

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