RETIREMENT-RELATED BENEFITS - Assumptions (Details)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Pension Plans
Weighted-average assumptions used to measure net periodic (income)/cost for the year ended December 31
Discount rate	0.62%	0.86%	1.65%
Expected long-term returns on plan assets	3.00%	4.03%	4.62%
Rate of compensation increase	2.22%	2.25%	1.37%
Weighted-average assumptions used to measure benefit obligations at December 31
Discount rate	1.19%	0.62%	0.86%
Rate of compensation increase	2.30%	2.22%	2.25%
Interest crediting rate	1.43%
Nonpension Postretirement Plans
Weighted-average assumptions used to measure net periodic (income)/cost for the year ended December 31
Discount rate	8.31%	8.31%	8.89%
Expected long-term returns on plan assets		8.20%	9.00%
Weighted-average assumptions used to measure benefit obligations at December 31
Discount rate	1.04%	8.31%	8.31%

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

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- Definition

Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ 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 (k)(3)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920

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- Definition

Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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