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Plant Closures (Details) - USD ($)	3 Months Ended		9 Months Ended		24 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2021
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Disposals	$ 6,000,000		$ 17,000,000
Accelerated depreciation		$ 35,000,000	105,000,000	$ 102,000,000	$ 447,000,000
Depreciation expense	$ 459,000,000	$ 347,000,000	1,400,000,000	$ 1,000,000,000
Additional depreciation for coal-fired fleet
Property, Plant and Equipment [Line Items]
Depreciation expense			$ 253,000,000

X

- Definition

Accelerated depreciation

+ References

No definition available.

+ Details

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X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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X

- Definition

Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

+ Details

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- Details

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