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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 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959 + Details
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