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Net Completed Plant Net Completed Plant (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Completed Plant |  |
Accumulated depreciation | $ 38,793 | $ 35,871
Net completed plant | 32,196 | 32,328
Property, Plant and Equipment, Gross | 70,989 | 68,199
Coal-fired |  |
Completed Plant |  |
Completed plant cost | 20,177 | 18,525
Accumulated depreciation | 16,635 | 14,464
Net completed plant | 3,542 | 4,061
Gas and oil-fired |  |
Completed Plant |  |
Completed plant cost | 7,051 | 6,663
Accumulated depreciation | 2,112 | 2,057
Net completed plant | 4,939 | 4,606
Nuclear |  |
Completed Plant |  |
Completed plant cost | 26,800 | 26,803
Accumulated depreciation | 14,149 | 13,557
Net completed plant | 12,651 | 13,246
Transmission |  |
Completed Plant |  |
Completed plant cost | 9,964 | 9,375
Accumulated depreciation | 3,450 | 3,359
Net completed plant | 6,514 | 6,016
Hydroelectric |  |
Completed Plant |  |
Completed plant cost | 4,307 | 4,109
Accumulated depreciation | 1,288 | 1,241
Net completed plant | 3,019 | 2,868
Other electrical plant |  |
Completed Plant |  |
Completed plant cost | 1,763 | 1,798
Accumulated depreciation | 737 | 780
Net completed plant | 1,026 | 1,018
Multipurpose dams |  |
Completed Plant |  |
Completed plant cost | 900 | 900
Accumulated depreciation | 413 | 404
Net completed plant | 487 | 496
Other stewardship |  |
Completed Plant |  |
Completed plant cost | 27 | 26
Accumulated depreciation | 9 | 9
Net completed plant | $ 18 | $ 17

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