POSTRETIREMENT BENEFIT PLANS - Asset Allocation (Details)	Dec. 31, 2023
Principal pension \| Global equities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	17.00%
Principal pension \| Global equities \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	10.00%
Principal pension \| Global equities \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	30.00%
Principal pension \| Debt securities (including cash equivalents)
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	55.00%
Principal pension \| Debt securities (including cash equivalents) \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	31.00%
Principal pension \| Debt securities (including cash equivalents) \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	81.50%
Principal pension \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	6.00%
Principal pension \| Real estate \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	1.00%
Principal pension \| Real estate \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	10.00%
Principal pension \| Private equities and other investments
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	22.00%
Principal pension \| Private equities and other investments \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	6.00%
Principal pension \| Private equities and other investments \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	34.00%
Other pension \| Global equities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	16.00%
Actual allocation	17.00%
Other pension \| Debt securities (including cash equivalents)
Defined Benefit Plan Disclosure [Line Items]
Target allocation	60.00%
Actual allocation	62.00%
Other pension \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Target allocation	8.00%
Actual allocation	10.00%
Other pension \| Private equities and other investments
Defined Benefit Plan Disclosure [Line Items]
Target allocation	16.00%
Actual allocation	11.00%

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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