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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

X

- Definition

Accumulated Depreciation, Depletion And Amortization, Property, Plant And Equipment Including Disposal Group, Including Discontinued Operations Assets Held-for-sale

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Net Plant Excluding Construction Work In Progress, Including Assets Held-for-sale

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Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
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Period end amount of construction work in progress in public utility.

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