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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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