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Net Completed Plant Net Completed Plant (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Completed Plant
Completed plant cost	$ 64,970	$ 62,944
Accumulated depreciation	33,550	31,384
Net completed plant	31,420	31,560
Revisions to asset retirement costs	1,100
Coal-fired
Completed Plant
Completed plant cost	18,613	17,400
Accumulated depreciation	13,944	12,538
Net completed plant	4,669	4,862
Gas and oil-fired
Completed Plant
Completed plant cost	6,010	6,054
Accumulated depreciation	1,696	1,562
Net completed plant	4,314	4,492
Nuclear
Completed Plant
Completed plant cost	25,741	25,543
Accumulated depreciation	12,141	11,656
Net completed plant	13,600	13,887
Transmission
Completed Plant
Completed plant cost	8,283	7,932
Accumulated depreciation	3,140	3,083
Net completed plant	5,143	4,849
Hydroelectric
Completed Plant
Completed plant cost	3,410	3,163
Accumulated depreciation	1,090	1,051
Net completed plant	2,320	2,112
Other electrical plant
Completed Plant
Completed plant cost	1,981	1,920
Accumulated depreciation	1,146	1,110
Net completed plant	835	810
Computer Software, Intangible Asset [Member]
Completed Plant
Completed plant cost	3	3
Accumulated depreciation	2	1
Net completed plant	1	2
Multipurpose dams
Completed Plant
Completed plant cost	900	900
Accumulated depreciation	381	373
Net completed plant	519	527
Other stewardship
Completed Plant
Completed plant cost	29	29
Accumulated depreciation	10	10
Net completed plant	$ 19	$ 19

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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