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Property, Plant and Equipment (Ownership of Coal-Fired Facilities) (Details) $ in Millions | Dec. 31, 2016 USD ($) facility
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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

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- Definition Number of Coal-Fired Generation Facilities, Jointly Owned + 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://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 + Details
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- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + 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 + Details
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- Definition The period end amount of accumulated depreciation in a jointly owned electricity generation plant. + 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 + Details
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- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + 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 + Details
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