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Net Completed Plant Net Completed Plant (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
--- | --- | ---
Completed Plant |  |
Completed plant cost | $ 47,564 | $ 47,073
Accumulated depreciation | 24,589 | 23,157
Net completed plant | 22,975 | 23,916
Coal-Fired |  |
Completed Plant |  |
Completed plant cost | 14,078 | 13,847
Accumulated depreciation | 9,065 | 8,429
Net completed plant | 5,013 | 5,418
Gas and Oil-Fired |  |
Completed Plant |  |
Completed plant cost | 3,411 | 3,386
Accumulated depreciation | 1,094 | 1,008
Net completed plant | 2,317 | 2,378
Nuclear |  |
Completed Plant |  |
Completed plant cost | 18,489 | 18,725
Accumulated depreciation | 9,593 | 9,103
Net completed plant | 8,896 | 9,622
Transmission |  |
Completed Plant |  |
Completed plant cost | 6,519 | 6,300
Accumulated depreciation | 2,683 | 2,562
Net completed plant | 3,836 | 3,738
Hydroelectric |  |
Completed Plant |  |
Completed plant cost | 2,547 | 2,392
Accumulated depreciation | 889 | 892
Net completed plant | 1,658 | 1,500
Other Electrical Plant |  |
Completed Plant |  |
Completed plant cost | 1,550 | 1,452
Accumulated depreciation | 885 | 792
Net completed plant | 665 | 660
Electric Subtotal |  |
Completed Plant |  |
Completed plant cost | 46,594 | 46,102
Accumulated depreciation | 24,209 | 22,786
Net completed plant | 22,385 | 23,316
Multipurpose Dams |  |
Completed Plant |  |
Completed plant cost | 928 | 928
Accumulated depreciation | 364 | 356
Net completed plant | 564 | 572
Other Stewardship |  |
Completed Plant |  |
Completed plant cost | 42 | 43
Accumulated depreciation | 16 | 15
Net completed plant | 26 | 28
Other Subtotal |  |
Completed Plant |  |
Completed plant cost | 970 | 971
Accumulated depreciation | 380 | 371
Net completed plant | $ 590 | $ 600

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- Definition Period end amount of property, plant and equipment (PPE) related to utility distribution less the cumulative amount of depreciation, depletion and amortization related to PPE that has been recognized in the Income Statement. + References No definition available. + Details
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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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