EMPLOYEE BENEFIT PLANS (Schedule of Estimated Benefits Expected to Be Paid) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
2021	$ 831
2022	913
2023	948
2024	980
2025	1,009
Thereafter in the succeeding five years	5,375
PBOP Plans
Defined Benefit Plan Disclosure [Line Items]
2021	85
2022	89
2023	92
2024	93
2025	95
Thereafter in the succeeding five years	471
Federal Subsidy
Defined Benefit Plan Disclosure [Line Items]
2021	(6)
2022	(6)
2023	(6)
2024	(7)
2025	(7)
Thereafter in the succeeding five years	$ (41)

Defined Benefit Plan, Expected Future Benefit, Five Fiscal Years Thereafter

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Defined Benefit Plan, Expected Future Receipt, Year Five

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Defined Benefit Plan, Expected Future Receipt, Year Four

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Defined Benefit Plan, Expected Future Receipt, Year One

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Defined Benefit Plan, Expected Future Receipt, Year Three

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Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

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