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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details) $ in Millions	Jun. 30, 2024 USD ($)	Sep. 30, 2023 USD ($) Bond_issues
Offsetting Liabilities [Line Items]
Number of currency swaps outstanding | Bond_issues		2
Accounts Receivable, before Allowance for Credit Loss, Current	$ 1,574	$ 1,627
Amount of letters of credit outstanding	6
Forward Contract Derivative Asset, at Fair Value	4	11
Letter of Credit
Offsetting Liabilities [Line Items]
Amount of letters of credit outstanding	446	535
Interest Swap Collateral
Offsetting Liabilities [Line Items]
Amount of letters of credit outstanding	415
Fair Value, Inputs, Level 2
Offsetting Liabilities [Line Items]
Forward Contract Derivative Asset, at Fair Value	$ 4	$ 11

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-Section 45
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