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Plant Closures (Details) - USD ($)	3 Months Ended		9 Months Ended	15 Months Ended
	Jun. 30, 2020	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2020
Property, Plant and Equipment [Line Items]
Accelerated depreciation	$ 34		$ 350	$ 916
Property, Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Dispositions	3 million	124 million	10 million	37 million
Property, Plant and Equipment, Disposals				$ 21,000,000
Paradise Fossil Plant [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Dispositions			2 million

X

- Definition

Accelerated depreciation

+ References

No definition available.

+ Details

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Balance Type:	debit
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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.

+ Details

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X

- Definition

Describes an entity's accounting treatment for disposals of property, plant and equipment, including gains and losses related thereto.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27011434&loc=d3e125663-122742

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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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- Details

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