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Subsequent Events (Details) - USD ($) $ in Millions	Nov. 14, 2022	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument, Redemption [Line Items]
Non-current regulatory liabilities		$ 172	$ 40
Regulatory assets		6,134	7,956
Unrealized gains/losses on commodity derivatives
Debt Instrument, Redemption [Line Items]
Non-current regulatory liabilities		$ 102	$ 40
Scenario, Forecast
Debt Instrument, Redemption [Line Items]
Increase/Decrease in Interest Rate Swap Liability	$ 120
Scenario, Forecast | Unrealized gains/losses on commodity derivatives
Debt Instrument, Redemption [Line Items]
Regulatory assets	2
Scenario, Forecast | DeferredDerivativeGainLossUnderFHP
Debt Instrument, Redemption [Line Items]
Regulatory assets	27
Scenario, Forecast | Unrealized gains/losses on commodity derivatives
Debt Instrument, Redemption [Line Items]
Non-current regulatory liabilities	48
Scenario, Forecast | DeferredDerivativeGainLossUnderFHP
Debt Instrument, Redemption [Line Items]
Non-current regulatory liabilities	$ 50

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Increase/Decrease in Interest Rate Swap Liability

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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

Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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