Jointly Owned Utility Facilities - PAC (Details) $ in Millions	Dec. 31, 2024 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Facility in service	$ 10,708
Accumulated depreciation	6,415
Construction work in progress	465
PAC
Jointly Owned Utility Plant Interests [Line Items]
Facility in service	4,761
Accumulated depreciation	2,781
Construction work in progress	$ 324
PAC \| Jim Bridger Nos. 1-4
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	67.00%
Facility in service	$ 1,564
Accumulated depreciation	991
Construction work in progress	$ 4
PAC \| Hunter No. 1
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	94.00%
Facility in service	$ 509
Accumulated depreciation	256
Construction work in progress	$ 3
PAC \| Hunter No. 2
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	60.00%
Facility in service	$ 315
Accumulated depreciation	161
Construction work in progress	$ 1
PAC \| Wyodak
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	80.00%
Facility in service	$ 492
Accumulated depreciation	301
Construction work in progress	$ 0
PAC \| Colstrip Nos. 3 and 4
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	10.00%
Facility in service	$ 263
Accumulated depreciation	217
Construction work in progress	$ 2
PAC \| Hermiston
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	50.00%
Facility in service	$ 191
Accumulated depreciation	115
Construction work in progress	$ 6
PAC \| Craig Nos. 1 and 2
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	19.00%
Facility in service	$ 373
Accumulated depreciation	352
Construction work in progress	$ 0
PAC \| Hayden No. 1
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	25.00%
Facility in service	$ 77
Accumulated depreciation	58
Construction work in progress	$ 0
PAC \| Hayden No. 2
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	13.00%
Facility in service	$ 45
Accumulated depreciation	34
Construction work in progress	0
PAC \| Transmission and distribution facilities
Jointly Owned Utility Plant Interests [Line Items]
Facility in service	932
Accumulated depreciation	296
Construction work in progress	$ 308

The period end amount owned by the reporting utility of a jointly owned utility plant in service.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1

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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

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- Definition

The period end amount of construction work in progress at a jointly owned electricity generation plant.

+ References

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- Definition

The period end amount of accumulated depreciation in a jointly owned electricity generation plant.

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- Definition

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

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