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ORGANIZATION AND BASIS OF PRESENTATION - Regulatory Assets on the Balance Sheet (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Regulatory assets on the Balance Sheets
Regulatory Liability	$ (1,826)	$ (2,360)
Regulatory Assets	82	99
Net Regulatory Liabilities included on the Consolidated Balance Sheets	(1,744)	(2,261)
Change	517
Regulatory Assets by Source Not Earning a Current Return	789	545
Change	244
Customer payables for future income taxes
Regulatory assets on the Balance Sheets
Regulatory Liability	(2,369)	(2,605)
Change	236
Nuclear decommissioning and spent fuel disposal costs
Regulatory assets on the Balance Sheets
Regulatory Liability	(102)	(197)
Change	95
Asset removal costs
Regulatory assets on the Balance Sheets
Regulatory Liability	(721)	(756)
Change	35
Deferred transmission costs
Regulatory assets on the Balance Sheets
Regulatory Assets	316	298
Change	18
Regulatory Assets by Source Not Earning a Current Return	29	27
Change	2
Deferred generation costs
Regulatory assets on the Balance Sheets
Regulatory Assets	104	214
Change	(110)
Regulatory Assets by Source Not Earning a Current Return	5	15
Change	(10)
Deferred distribution costs
Regulatory assets on the Balance Sheets
Regulatory Assets	136	155
Change	(19)
Contract valuations
Regulatory assets on the Balance Sheets
Regulatory Assets	41	51
Change	(10)
Storm-related costs
Regulatory assets on the Balance Sheets
Regulatory Assets	748	551
Change	197
Regulatory Assets by Source Not Earning a Current Return	654	471
Change	183
Uncollectible and COVID-19 related costs
Regulatory assets on the Balance Sheets
Regulatory Assets	97	3
Change	94
Regulatory Assets by Source Not Earning a Current Return	66	0
Change	66
Other
Regulatory assets on the Balance Sheets
Regulatory Assets	6	25
Change	(19)
Regulatory Assets by Source Not Earning a Current Return	35	$ 32
Change	$ 3

X

- Definition

Increase (Decrease) in Regulatory Assets

+ References

No definition available.

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- Definition

The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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- Definition

The net amount of all regulatory assets less all regulatory liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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- Definition

Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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- Definition

The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
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- Definition

Remaining balance of regulatory assets for which no return on investment during recovery is provided. In some cases, a regulator may permit an enterprise to include a cost that would be charged to expense by an unregulated enterprise as an allowable cost over a period of time by amortizing that cost for rate-making purposes, but the regulator does not include the unrecovered amount in the rate base.

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