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Commitments and Contingencies - Ownership and Operating Interest Percentage (Details)	Dec. 31, 2022	Sep. 30, 2022
Loss Contingencies [Line Items]
Owners percentage interest	15.00%
Avista [Member] | Unit 3 [Member] | Colstrip [Member]
Loss Contingencies [Line Items]
Owners percentage interest	15.00%
Avista [Member] | Unit 4 [Member] | Colstrip [Member]
Loss Contingencies [Line Items]
Owners percentage interest	15.00%
Pacificorp [Member] | Unit 3 [Member] | Colstrip [Member]
Loss Contingencies [Line Items]
Owners percentage interest	10.00%
Pacificorp [Member] | Unit 4 [Member] | Colstrip [Member]
Loss Contingencies [Line Items]
Owners percentage interest	10.00%
PGE [Member] | Unit 3 [Member] | Colstrip [Member]
Loss Contingencies [Line Items]
Owners percentage interest	20.00%
PGE [Member] | Unit 4 [Member] | Colstrip [Member]
Loss Contingencies [Line Items]
Owners percentage interest	20.00%
PSE [Member] | Unit 3 [Member] | Colstrip [Member]
Loss Contingencies [Line Items]
Owners percentage interest	25.00%	25.00%
PSE [Member] | Unit 4 [Member] | Colstrip [Member]
Loss Contingencies [Line Items]
Owners percentage interest	25.00%	25.00%
NorthWestern [Member] | Unit 4 [Member] | Colstrip [Member]
Loss Contingencies [Line Items]
Owners percentage interest	30.00%
Talen [Member] | Unit 3 [Member] | Colstrip [Member]
Loss Contingencies [Line Items]
Owners percentage interest	30.00%

X

- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-URI https://asc.fasb.org/extlink&oid=122136288&loc=d3e659983-123033

+ Details

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X

- 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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