RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - POSTRETIREMENT AND OTHER BENEFIT PLANS (Details) - USD ($) $ in Millions		12 Months Ended
Aug. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
POST RETIREMENT AND OTHER BENEFIT PLANS
Total benefit costs, including postretirement costs		$ 182	$ 181	$ 182
Decrease to benefit obligation	$ 178

Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(7)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanPlanAmendments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration