Jointly Owned Utility Facilities - EGTS (Details) $ in Millions	Dec. 31, 2023 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Facility in service	$ 10,659
Accumulated depreciation	6,459
Construction work in progress	322
EGTS
Jointly Owned Utility Plant Interests [Line Items]
Facility in service	482
Accumulated depreciation	162
Construction work in progress	$ 9
Ellisburg Pool \| EGTS
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	39.00%
Facility in service	$ 33
Accumulated depreciation	12
Construction work in progress	$ 0
Ellisburg Station \| EGTS
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	50.00%
Facility in service	$ 29
Accumulated depreciation	9
Construction work in progress	$ 2
Harrison \| EGTS
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	50.00%
Facility in service	$ 56
Accumulated depreciation	19
Construction work in progress	$ 1
Leidy \| EGTS
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	50.00%
Facility in service	$ 148
Accumulated depreciation	49
Construction work in progress	$ 2
Oakford \| EGTS
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	50.00%
Facility in service	$ 216
Accumulated depreciation	73
Construction work in progress	$ 4

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//1943274/2147479960/980-360-S99-1

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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.

+ 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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