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Net Completed Plant Net Completed Plant (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018
Completed Plant
Completed plant cost	$ 62,944	$ 61,114
Accumulated depreciation	31,384	29,335
Net completed plant	31,560	31,779
Coal-fired
Completed Plant
Completed plant cost	17,400	16,482
Accumulated depreciation	12,538	11,033
Net completed plant	4,862	5,449
Gas and oil-fired
Completed Plant
Completed plant cost	6,054	5,990
Accumulated depreciation	1,562	1,459
Net completed plant	4,492	4,531
Nuclear
Completed Plant
Completed plant cost	25,543	25,227
Accumulated depreciation	11,656	11,310
Net completed plant	13,887	13,917
Transmission
Completed Plant
Completed plant cost	7,932	7,515
Accumulated depreciation	3,083	3,038
Net completed plant	4,849	4,477
Hydroelectric
Completed Plant
Completed plant cost	3,163	3,087
Accumulated depreciation	1,051	1,012
Net completed plant	2,112	2,075
Other electrical plant
Completed Plant
Completed plant cost	1,920	1,881
Accumulated depreciation	1,110	1,107
Net completed plant	810	774
Computer Software, Intangible Asset [Member]
Completed Plant
Completed plant cost	3	3
Accumulated depreciation	1	0
Net completed plant	2	3
Multipurpose dams
Completed Plant
Completed plant cost	900	900
Accumulated depreciation	373	367
Net completed plant	527	533
Other stewardship
Completed Plant
Completed plant cost	29	29
Accumulated depreciation	10	9
Net completed plant	$ 19	$ 20

X

- 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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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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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.

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