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ORGANIZATION AND BASIS OF PRESENTATION - Property, Plant and Equipment Balances (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Property, Plant and Equipment |  |
In Service | $ 43,726 | $ 41,767
Accum. Depr. | (11,965) | (11,427)
Net Plant | 31,761 | 30,340
CWIP | 1,578 | 1,310
Total | 33,339 | 31,650
Capital leased assets | 153 | 163
Utilities and FET |  |
Property, Plant and Equipment |  |
In Service | 29,775 | 28,735
Accum. Depr. | (8,800) | (8,540)
Net Plant | 20,975 | 20,195
CWIP | 841 | 744
Total | 21,816 | 20,939
Regulated Transmission |  |
Property, Plant and Equipment |  |
In Service | 12,912 | 12,023
Accum. Depr. | (2,609) | (2,383)
Net Plant | 10,303 | 9,640
CWIP | 671 | 526
Total | 10,974 | 10,166
Corporate/Other |  |
Property, Plant and Equipment |  |
In Service | 1,039 | 1,009
Accum. Depr. | (556) | (504)
Net Plant | 483 | 505
CWIP | 66 | 40
Total | $ 549 | $ 545

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