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Property, Plant and Equipment (Ownership of Coal-Fired Facilities) (Details) $ in Millions | Dec. 31, 2015 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 | $ 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

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