Property, Plant and Equipment (Ownership of Coal-Fired Facilities) (Details) $ in Millions	Dec. 31, 2016 USD ($) facility
Jointly Owned Utility Plant Interests [Line Items]
Number of Coal-Fired Generation Facilities, Jointly Owned \| facility	5
Conesville Unit 4
Jointly Owned Utility Plant Interests [Line Items]
Construction Work In Process	$ 0
Ownership	17.00%
Gross Plant In Service	$ 0
Accumulated Depreciation	0
Killen Station
Jointly Owned Utility Plant Interests [Line Items]
Construction Work In Process	$ 2
Ownership	67.00%
Gross Plant In Service	$ 34
Accumulated Depreciation	0
Miami Fort Units 7 and 8
Jointly Owned Utility Plant Interests [Line Items]
Construction Work In Process	$ 7
Ownership	36.00%
Gross Plant In Service	$ 27
Accumulated Depreciation	0
Stuart Station
Jointly Owned Utility Plant Interests [Line Items]
Construction Work In Process	$ 23
Ownership	35.00%
Gross Plant In Service	$ 24
Accumulated Depreciation	0
Zimmer Station
Jointly Owned Utility Plant Interests [Line Items]
Construction Work In Process	$ 9
Ownership	28.00%
Gross Plant In Service	$ 7
Accumulated Depreciation	0
Transmission
Jointly Owned Utility Plant Interests [Line Items]
Construction Work In Process	0
Gross Plant In Service	99
Accumulated Depreciation	66
Total Jointly Owned Plant
Jointly Owned Utility Plant Interests [Line Items]
Construction Work In Process	41
Gross Plant In Service	191
Accumulated Depreciation	$ 66

Number of Coal-Fired Generation Facilities, Jointly Owned

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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://www.xbrl.org/2003/role/presentationRef
-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=6500719&loc=d3e659983-123033

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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

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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.

+ References

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