Jointly Owned Utility Facilities - PAC (Details) $ in Millions	Dec. 31, 2021 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Facility in service	$ 10,504
Accumulated depreciation	5,498
Construction work in progress	246
PAC
Jointly Owned Utility Plant Interests [Line Items]
Facility in service	4,609
Accumulated depreciation	2,363
Construction work in progress	$ 153
PAC \| Jim Bridger Nos. 1-4
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	67.00%
Facility in service	$ 1,523
Accumulated depreciation	812
Construction work in progress	$ 15
PAC \| Hunter No. 1
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	94.00%
Facility in service	$ 489
Accumulated depreciation	221
Construction work in progress	$ 8
PAC \| Hunter No. 2
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	60.00%
Facility in service	$ 306
Accumulated depreciation	138
Construction work in progress	$ 1
PAC \| Wyodak
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	80.00%
Facility in service	$ 477
Accumulated depreciation	269
Construction work in progress	$ 8
PAC \| Colstrip Nos. 3 and 4
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	10.00%
Facility in service	$ 260
Accumulated depreciation	161
Construction work in progress	$ 3
PAC \| Hermiston
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	50.00%
Facility in service	$ 185
Accumulated depreciation	99
Construction work in progress	$ 0
PAC \| Craig Nos. 1 and 2
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	19.00%
Facility in service	$ 369
Accumulated depreciation	319
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	47
Construction work in progress	$ 0
PAC \| Hayden No. 2
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	13.00%
Facility in service	$ 44
Accumulated depreciation	28
Construction work in progress	0
PAC \| Transmission and distribution facilities
Jointly Owned Utility Plant Interests [Line Items]
Facility in service	879
Accumulated depreciation	269
Construction work in progress	$ 118

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

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+ References

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- Definition

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

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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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