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Net Completed Plant Net Completed Plant (Tables)
12 Months Ended
Sep. 30, 2021
Property, Plant and Equipment, Net, by Type [Abstract]  
Net Completed Plant
Net completed plant consisted of the following:
Net Completed Plant
At September 30
 20212020
 CostAccumulated Depreciation 
Net
CostAccumulated DepreciationNet
Coal-fired(1)(2)
$19,319 $14,357 $4,962 $18,613 $13,944 $4,669 
Gas and oil-fired6,076 1,824 4,252 6,010 1,696 4,314 
Nuclear26,024 12,632 13,392 25,741 12,141 13,600 
Transmission8,597 3,215 5,382 8,283 3,140 5,143 
Hydroelectric3,525 1,135 2,390 3,410 1,090 2,320 
Other electrical plant1,940 1,101 839 1,981 1,146 835 
Intangible software
Multipurpose dams900 388 512 900 381 519 
Other stewardship27 18 29 10 19 
Total$66,411 $34,663 $31,748 $64,970 $33,550 $31,420