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Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Sep. 30, 2021
Regulatory Assets and Liabilities
Current regulatory assets	$ 389	$ 196
Non-current regulatory assets	7,789	7,956
Regulatory assets	8,178	8,152
Current regulatory liabilities	331	340
Regulatory Liability, Noncurrent	88	40
Regulatory Liabilities	419	380
Fuel cost adjustment tax equivalents
Regulatory Assets and Liabilities
Current regulatory liabilities	165	130
Unrealized gains/losses on commodity derivatives
Regulatory Assets and Liabilities
Current regulatory liabilities	166	210
Regulatory Liability, Noncurrent	88	40
Unrealized losses on interest rate derivatives [Member]
Regulatory Assets and Liabilities
Current regulatory assets	71	114
Non-current regulatory assets	645	1,122
Unrealized gains/losses on commodity derivatives
Regulatory Assets and Liabilities
Current regulatory assets	14	3
Non-current regulatory assets	5	0
Fuel cost adjustment receivable/liability
Regulatory Assets and Liabilities
Current regulatory assets	304	79
Pension Costs [Member]
Regulatory Assets and Liabilities
Non-current regulatory assets	3,442	3,668
Nuclear desommissioning costs [Member]
Regulatory Assets and Liabilities
Non-current regulatory assets	686	363
Non-nuclear decommissioning [Member]
Regulatory Assets and Liabilities
Non-current regulatory assets	2,872	2,653
Other non-current regulatory assets [Member]
Regulatory Assets and Liabilities
Non-current regulatory assets	$ 139	$ 150

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- Definition

Regulatory Assets and Liabilities [Line Items]

+ References

No definition available.

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
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- Definition

Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

+ References

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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

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

+ References

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-Topic 980
-SubTopic 405
-Section 25
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The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

+ References

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-Name Accounting Standards Codification
-Topic 980
-SubTopic 405
-Section 25
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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
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