Property, Plant and Equipment (Ownership of Coal-Fired Facilities) (Details) $ in Millions	Dec. 31, 2015 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	$ 1
Ownership	17.00%
Gross Plant In Service	$ 26
Accumulated Depreciation	4
Killen Station
Jointly Owned Utility Plant Interests [Line Items]
Construction Work In Process	$ 2
Ownership	67.00%
Gross Plant In Service	$ 342
Accumulated Depreciation	29
Miami Fort Units 7 and 8
Jointly Owned Utility Plant Interests [Line Items]
Construction Work In Process	$ 6
Ownership	36.00%
Gross Plant In Service	$ 219
Accumulated Depreciation	32
Stuart Station
Jointly Owned Utility Plant Interests [Line Items]
Construction Work In Process	$ 18
Ownership	35.00%
Gross Plant In Service	$ 236
Accumulated Depreciation	19
Zimmer Station
Jointly Owned Utility Plant Interests [Line Items]
Construction Work In Process	$ 12
Ownership	28.00%
Gross Plant In Service	$ 188
Accumulated Depreciation	44
Transmission
Jointly Owned Utility Plant Interests [Line Items]
Construction Work In Process	0
Gross Plant In Service	43
Accumulated Depreciation	8
Total Jointly Owned Plant
Jointly Owned Utility Plant Interests [Line Items]
Construction Work In Process	39
Gross Plant In Service	1,054
Accumulated Depreciation	$ 136

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section C

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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.

+ References

No definition available.

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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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