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Net Completed Plant Net Completed Plant (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
--- | --- | ---
Completed Plant |  |
Completed plant cost | $ 47,073 | $ 45,917
Accumulated depreciation | 23,157 | 22,169
Net completed plant | 23,916 | 23,748
Coal-Fired |  |
Completed Plant |  |
Completed plant cost | 13,847 | 13,726
Accumulated depreciation | 8,429 | 7,962
Net completed plant | 5,418 | 5,764
Gas and Oil-Fired |  |
Completed Plant |  |
Completed plant cost | 3,386 | 3,334
Accumulated depreciation | 1,008 | 916
Net completed plant | 2,378 | 2,418
Nuclear |  |
Completed Plant |  |
Completed plant cost | 18,725 | 18,042
Accumulated depreciation | 9,103 | 8,791
Net completed plant | 9,622 | 9,251
Transmission |  |
Completed Plant |  |
Completed plant cost | 6,300 | 6,075
Accumulated depreciation | 2,562 | 2,427
Net completed plant | 3,738 | 3,648
Hydroelectric |  |
Completed Plant |  |
Completed plant cost | 2,392 | 2,278
Accumulated depreciation | 892 | 869
Net completed plant | 1,500 | 1,409
Other Electrical Plant |  |
Completed Plant |  |
Completed plant cost | 1,452 | 1,490
Accumulated depreciation | 792 | 842
Net completed plant | 660 | 648
Electric Subtotal |  |
Completed Plant |  |
Completed plant cost | 46,102 | 44,945
Accumulated depreciation | 22,786 | 21,807
Net completed plant | 23,316 | 23,138
Multipurpose Dams |  |
Completed Plant |  |
Completed plant cost | 928 | 928
Accumulated depreciation | 356 | 347
Net completed plant | 572 | 581
Other Stewardship |  |
Completed Plant |  |
Completed plant cost | 43 | 44
Accumulated depreciation | 15 | 15
Net completed plant | 28 | 29
Other Subtotal |  |
Completed Plant |  |
Completed plant cost | 971 | 972
Accumulated depreciation | 371 | 362
Net completed plant | $ 600 | $ 610

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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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