EMPLOYEE BENEFIT PLANS (Reconciliation of Changes in Fair Value of Level III Assets) (Details) - Level 3 - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of Period	$ 27	$ 26
Actual Return on Plan Assets:
Assets Held at Reporting Date	3	3
Purchases, Sales, and Settlements	(2)	(2)
End of Period	28	27
Private Equity
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of Period	6	7
Actual Return on Plan Assets:
Assets Held at Reporting Date	2	1
Purchases, Sales, and Settlements	(2)	(2)
End of Period	6	6
Real Estate
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning of Period	21	19
Actual Return on Plan Assets:
Assets Held at Reporting Date	1	2
Purchases, Sales, and Settlements	0	0
End of Period	$ 22	$ 21