Jointly Owned Utility Facilities - NPC (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
NPC
Jointly Owned Utility Plant Interests [Line Items]
Facility in service	186
Accumulated depreciation	60
Construction work in progress	$ 1
NPC \| Navajo
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	11.00%
Facility in service	$ 5
Accumulated depreciation	5
Construction work in progress	$ 0
NPC \| ON Line deferrals
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	19.00%
Facility in service	$ 120
Accumulated depreciation	23
Construction work in progress	1
NPC \| Other transmission facilities
Jointly Owned Utility Plant Interests [Line Items]
Facility in service	61
Accumulated depreciation	32
Construction work in progress	$ 0

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

+ Details

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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.

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- Definition

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

+ References

+ Details

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- Definition

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

+ References

+ Details

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- Definition

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

+ References

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