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Net Completed Plant Net Completed Plant (Tables)
12 Months Ended
Sep. 30, 2022
Property, Plant and Equipment, Net, by Type [Abstract]  
Net Completed Plant
Net completed plant consisted of the following:
Net Completed Plant
At September 30
(in millions)
 20222021
 CostAccumulated Depreciation 
Net
CostAccumulated DepreciationNet
Coal-fired(1)
$18,145 $13,649 $4,496 $19,319 $14,357 $4,962 
Gas and oil-fired6,112 1,957 4,155 6,076 1,824 4,252 
Nuclear26,629 12,928 13,701 26,024 12,632 13,392 
Transmission8,919 3,301 5,618 8,597 3,215 5,382 
Hydroelectric3,987 1,192 2,795 3,525 1,135 2,390 
Other electrical plant1,724 807 917 1,943 1,103 840 
Multipurpose dams900 396 504 900 388 512 
Other stewardship26 17 27 18 
Total$66,442 $34,239 $32,203 $66,411 $34,663 $31,748