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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Credit Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	$ 91	$ 33	$ 280	$ 96
Total regulatory balancing accounts receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Total regulatory balancing accounts, net	2,905		2,905		$ 2,001
Total regulatory balancing accounts receivable | Residential uncollectibles balancing accounts
Financing Receivable, Allowance for Credit Loss [Line Items]
Total regulatory balancing accounts, net	250		250
COVID-19 pandemic protection memorandum account
Financing Receivable, Allowance for Credit Loss [Line Items]
Regulatory assets	30		30
COVID-19 pandemic protection memorandum account | Residential uncollectibles balancing accounts
Financing Receivable, Allowance for Credit Loss [Line Items]
Total regulatory balancing accounts, net	250		250
Federal Energy Regulatory Commission (FERC)
Financing Receivable, Allowance for Credit Loss [Line Items]
Regulatory assets	$ 33		$ 33

X

- Definition

The Utility's current regulatory balancing accounts represent the amounts expected to be received from or refunded to the Utility's customers through authorized rate adjustments within the next 12 months.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in allowance for credit loss on financing receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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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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