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Risk Management Activities and Derivative Transactions Collateral (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021
Derivative
Forward Contract Derivative Asset, at Fair Value	$ (2)	$ 2
Likely cash collateral obligation increase	22
Collateralized Securities [Member]
Derivative
Derivative, Net Liability Position, Aggregate Fair Value	1,700
Derivative, Collateral, Right to Reclaim Cash	1,100
Letter of Credit
Derivative
Amount of letters of credit outstanding	1,114	1,200
Fair Value, Inputs, Level 2
Derivative
Forward Contract Derivative Asset, at Fair Value	$ (2)	$ 2

X

- Definition

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

+ References

No definition available.

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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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- Definition

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

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-Publisher FASB
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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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- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

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- Definition

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

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