Jointly Owned Utility Facilities - MEC (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
Walter Scott, Jr. No. 4
Jointly Owned Utility Plant Interests [Line Items]
Revenue sharing credits netted against facility in service	953
Revenue sharing credits netted against accumulated depreciation	218
MEC
Jointly Owned Utility Plant Interests [Line Items]
Facility in service	4,558
Accumulated depreciation	2,839
Construction work in progress	$ 80
MEC \| Louisa No. 1
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	88.00%
Facility in service	$ 988
Accumulated depreciation	559
Construction work in progress	$ 7
MEC \| Quad Cities Nos. 1 and 2
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	25.00%
Facility in service	$ 747
Accumulated depreciation	501
Construction work in progress	$ 13
MEC \| Walter Scott, Jr. No. 3
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	79.00%
Facility in service	$ 1,033
Accumulated depreciation	679
Construction work in progress	$ 10
MEC \| Walter Scott, Jr. No. 4
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	60.00%
Facility in service	$ 177
Accumulated depreciation	124
Construction work in progress	$ 12
MEC \| George Neal No. 4
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	41.00%
Facility in service	$ 337
Accumulated depreciation	199
Construction work in progress	$ 5
MEC \| Ottumwa No. 1
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	52.00%
Facility in service	$ 402
Accumulated depreciation	306
Construction work in progress	$ 16
MEC \| George Neal No. 3
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	72.00%
Facility in service	$ 598
Accumulated depreciation	368
Construction work in progress	13
MEC \| Transmission facilities
Jointly Owned Utility Plant Interests [Line Items]
Facility in service	276
Accumulated depreciation	103
Construction work in progress	$ 4

Amount of credits applied under state revenue sharing arrangements that are netted against accumulated depreciation.

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- Definition

Amount of credits applied under state revenue sharing arrangements that are netted against facility in service.

+ References

No definition available.

+ Details

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- Definition

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

+ References

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.

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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.

+ References

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- Definition

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

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