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Risk Management Activities and Derivative Transactions Collateral (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Derivative
Amount of letters of credit outstanding	$ 6
Forward Contract Derivative Asset, at Fair Value	8	$ 4
Likely cash collateral obligation increase	22
Collateralized Securities [Member]
Derivative
Derivative, Collateral, Right to Reclaim Cash	549
Letter of Credit
Derivative
Amount of letters of credit outstanding	595	704
Fair Value, Inputs, Level 2
Derivative
Forward Contract Derivative Asset, at Fair Value	$ 8	$ 4

X

- Definition

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

+ References

No definition available.

+ Details

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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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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (e)
-Publisher FASB
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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 13
-SubTopic 20
-Topic 210
-Publisher FASB
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
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- Definition

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

+ References

No definition available.

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