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Risk Management Activities and Derivative Transactions Collateral (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022
Derivative
Forward Contract Derivative Asset, at Fair Value	$ 9	$ 4
Likely cash collateral obligation increase	22
Collateral Paid	50	0
Collateralized Securities [Member]
Derivative
Derivative, Collateral, Right to Reclaim Cash	569
Letter of Credit
Derivative
Amount of letters of credit outstanding	586	704
Fair Value, Inputs, Level 2
Derivative
Forward Contract Derivative Asset, at Fair Value	$ 9	$ 4

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- Definition

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- Definition

Fair value as of the balance sheet date of forward contract derivative assets.

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- Definition

The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

+ References

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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