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Risk Management Activities and Derivative Transactions Offsetting of Derivative Assets (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Offsetting Assets [Line Items] |  |
Gross amounts of recognized liabilities | $ 1,468 | $ 1,725
Total derivatives not subject to master netting or similar arrangement | 209 | 250
Forward Contract Derivative Asset, at Fair Value | 2 | 2
Derivative Liability, Not Subject to Master Netting Arrangement | 7 | 3
Derivative Asset, Fair Value, Gross Liability | 261 | 250
Letter of Credit |  |
Offsetting Assets [Line Items] |  |
Amount of letters of credit outstanding for credit facilities | 1,017 | 1,200
Currency Swap |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized liabilities | 93 | 83
Interest Rate Contract |  |
Offsetting Assets [Line Items] |  |
Gross amounts of recognized liabilities | 1,368 | 1,639
Fair Value, Inputs, Level 2 |  |
Offsetting Assets [Line Items] |  |
Forward Contract Derivative Asset, at Fair Value | $ 2 | $ 2

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