EMPLOYEE BENEFIT PLANS (Schedule of Estimated Benefits Expected to Be Paid) (Details) $ in Millions	Dec. 31, 2021 USD ($)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
2022	$ 869
2023	954
2024	988
2025	1,018
2026	1,046
Thereafter in the succeeding five years	5,533
PBOP Plans
Defined Benefit Plan Disclosure [Line Items]
2022	81
2023	85
2024	89
2025	88
2026	91
Thereafter in the succeeding five years	466
Federal Subsidy
Defined Benefit Plan Disclosure [Line Items]
2022	(3)
2023	(3)
2024	(3)
2025	(3)
2026	(3)
Thereafter in the succeeding five years	$ (3)

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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Defined Benefit Plan, Expected Future Receipt, Year Two

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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.

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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=123447040&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 fifth 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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