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Property, Plant and Equipment - (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Property, Plant and Equipment |  |
Utility | $ 4,265 | $ 3,938
Non-utility | 6,393 | 6,135
Total property, plant and equipment | 10,658 | 10,073
Distribution |  |
Property, Plant and Equipment |  |
Utility | 3,630 | 3,366
Transmission |  |
Property, Plant and Equipment |  |
Utility | 111 | 106
General and other |  |
Property, Plant and Equipment |  |
Utility | 425 | 389
Work in process |  |
Property, Plant and Equipment |  |
Utility | 99 | 77
Non-utility | 196 | 102
Land |  |
Property, Plant and Equipment |  |
Non-utility | 191 | 184
Buildings and improvements |  |
Property, Plant and Equipment |  |
Non-utility | 431 | 404
Transportation equipment |  |
Property, Plant and Equipment |  |
Non-utility | 248 | 258
Equipment, primarily cylinders and tanks |  |
Property, Plant and Equipment |  |
Non-utility | 3,712 | 3,455
Electric generation |  |
Property, Plant and Equipment |  |
Non-utility | 211 | 327
Pipeline and related assets |  |
Property, Plant and Equipment |  |
Non-utility | 1,098 | 1,150
Other |  |
Property, Plant and Equipment |  |
Non-utility | $ 306 | $ 255

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