RETIREMENT BENEFITS - Actuarial Assumptions (Details) - Pension Plans, Defined Benefit	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Discount rate	1.60%	1.20%
Rate of compensation increase	1.00%	1.30%
Interest crediting rate	2.10%	2.20%
Discount rate	1.20%	1.60%	3.20%
Expected long-term return on plan assets	3.60%	4.10%	4.50%
Rate of compensation increase	1.30%	1.30%	0.50%
Interest crediting rate	2.20%	2.20%	2.70%