RETIREMENT BENEFITS - Interest Crediting Rate (Details)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans
Weighted average interest crediting rate	3.25%	2.60%	3.10%
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans
Weighted average interest crediting rate	1.68%	1.74%	1.75%

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.

No definition available.

Name:	us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration