POSTRETIREMENT BENEFIT PLANS - Asset Allocation (Details)	Dec. 31, 2020
Principal pension \| Global equities
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	37.00%
Principal pension \| Global equities \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	30.00%
Principal pension \| Global equities \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	47.00%
Principal pension \| Debt securities (including cash equivalents)
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	45.00%
Principal pension \| Debt securities (including cash equivalents) \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	21.00%
Principal pension \| Debt securities (including cash equivalents) \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	65.00%
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	3.50%
Principal pension \| Real estate \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	13.50%
Principal pension \| Private equities & other investments
Defined Benefit Plan Disclosure [Line Items]
Actual allocation	12.00%
Principal pension \| Private equities & other investments \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	6.00%
Principal pension \| Private equities & other investments \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Target allocation	16.00%
Other pension \| Global equities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	22.00%
Actual allocation	25.00%
Other pension \| Debt securities (including cash equivalents)
Defined Benefit Plan Disclosure [Line Items]
Target allocation	52.00%
Actual allocation	56.00%
Other pension \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Target allocation	9.00%
Actual allocation	10.00%
Other pension \| Private equities & other investments
Defined Benefit Plan Disclosure [Line Items]
Target allocation	17.00%
Actual allocation	9.00%

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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