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Net Completed Plant Net Completed Plant (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015
Completed Plant
Completed plant cost	$ 51,564	$ 50,069
Accumulated depreciation	27,592	26,318
Net completed plant	23,972	23,751
Coal-fired
Completed Plant
Completed plant cost	15,587	15,202
Accumulated depreciation	10,473	9,942
Net completed plant	5,114	5,260
Gas and oil-fired
Completed Plant
Completed plant cost	3,918	3,794
Accumulated depreciation	1,267	1,194
Net completed plant	2,651	2,600
Nuclear
Completed Plant
Completed plant cost	19,280	18,920
Accumulated depreciation	10,422	10,063
Net completed plant	8,858	8,857
Transmission
Completed Plant
Completed plant cost	7,061	6,803
Accumulated depreciation	2,975	2,823
Net completed plant	4,086	3,980
Hydroelectric
Completed Plant
Completed plant cost	2,891	2,702
Accumulated depreciation	932	911
Net completed plant	1,959	1,791
Other electrical plant
Completed Plant
Completed plant cost	1,857	1,678
Accumulated depreciation	1,126	997
Net completed plant	731	681
Electric Subtotal
Completed Plant
Completed plant cost	50,594	49,099
Accumulated depreciation	27,195	25,930
Net completed plant	23,399	23,169
Multipurpose dams
Completed Plant
Completed plant cost	928	928
Accumulated depreciation	379	371
Net completed plant	549	557
Other stewardship
Completed Plant
Completed plant cost	42	42
Accumulated depreciation	18	17
Net completed plant	24	25
Other Subtotal
Completed Plant
Completed plant cost	970	970
Accumulated depreciation	397	388
Net completed plant	$ 573	$ 582

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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.

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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

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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
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-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

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-Name Accounting Standards Codification
-Topic 210
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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