Jointly Owned Utility Facilities - MEC (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
Walter Scott, Jr. No. 4
Jointly Owned Utility Plant Interests [Line Items]
Revenue sharing credits netted against facility in service	561
Revenue sharing credits netted against accumulated depreciation	127
MEC
Jointly Owned Utility Plant Interests [Line Items]
Facility in service	4,553
Accumulated depreciation	2,439
Construction work in progress	$ 80
MEC \| Louisa No. 1
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	88.00%
Facility in service	$ 864
Accumulated depreciation	501
Construction work in progress	$ 20
MEC \| Quad Cities Station
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	25.00%
Facility in service	$ 732
Accumulated depreciation	452
Construction work in progress	$ 9
MEC \| Walter Scott, Jr. No. 3
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	79.00%
Facility in service	$ 949
Accumulated depreciation	518
Construction work in progress	$ 15
MEC \| Walter Scott, Jr. No. 4
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	60.00%
Facility in service	$ 225
Accumulated depreciation	134
Construction work in progress	$ 8
MEC \| George Neal No. 4
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	41.00%
Facility in service	$ 318
Accumulated depreciation	184
Construction work in progress	$ 4
MEC \| Ottumwa No. 1
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	52.00%
Facility in service	$ 674
Accumulated depreciation	264
Construction work in progress	$ 11
MEC \| George Neal No. 3
Jointly Owned Utility Plant Interests [Line Items]
Ownership share	72.00%
Facility in service	$ 528
Accumulated depreciation	286
Construction work in progress	9
MEC \| Transmission facilities
Jointly Owned Utility Plant Interests [Line Items]
Facility in service	263
Accumulated depreciation	100
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
-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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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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