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Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Sep. 30, 2020
Regulatory Assets and Liabilities
Current regulatory assets	$ 155	$ 130
Non-current regulatory assets	9,230	10,245
Regulatory assets	9,385	10,375
Current regulatory liabilities	141	141
Regulatory Liability, Noncurrent	5	23
Regulatory Liabilities	146	164
Fuel cost adjustment tax equivalents
Regulatory Assets and Liabilities
Current regulatory liabilities	115	115
Unrealized gains/losses on commodity derivatives
Regulatory Assets and Liabilities
Current regulatory liabilities	26	26
Regulatory Liability, Noncurrent	5	23
Unrealized losses on interest rate derivatives [Member]
Regulatory Assets and Liabilities
Current regulatory assets	114	114
Non-current regulatory assets	986	1,506
Unrealized gains/losses on commodity derivatives
Regulatory Assets and Liabilities
Current regulatory assets	0	4
Non-current regulatory assets	4	0
Fuel cost adjustment receivable/liability
Regulatory Assets and Liabilities
Current regulatory assets	41	12
Pension Costs [Member]
Regulatory Assets and Liabilities
Non-current regulatory assets	5,009	5,193
Nuclear desommissioning costs [Member]
Regulatory Assets and Liabilities
Non-current regulatory assets	482	896
Non-nuclear decommissioning [Member]
Regulatory Assets and Liabilities
Non-current regulatory assets	2,604	2,512
Other non-current regulatory assets [Member]
Regulatory Assets and Liabilities
Non-current regulatory assets	$ 145	$ 138

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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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-SubTopic 405
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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
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-SubTopic 405
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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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