EMPLOYEE BENEFIT PLANS (Reconciliation of Changes in Fair Value of Level III Assets) (Details) - Level 3 - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Reconciliation Of Changes In Fair Value Of Assets And Liabilities [Line Items]
Beginning of Period	$ 26	$ 25
Actual Return on Plan Assets:
Assets Held at Reporting Date	3	2
Purchases, Sales, and Settlements	(2)	(1)
End of Period	27	26
Private Equity
Schedule Of Reconciliation Of Changes In Fair Value Of Assets And Liabilities [Line Items]
Beginning of Period	7	7
Actual Return on Plan Assets:
Assets Held at Reporting Date	1	1
Purchases, Sales, and Settlements	(2)	(1)
End of Period	6	7
Real Estate
Schedule Of Reconciliation Of Changes In Fair Value Of Assets And Liabilities [Line Items]
Beginning of Period	19	18
Actual Return on Plan Assets:
Assets Held at Reporting Date	2	1
Purchases, Sales, and Settlements	0	0
End of Period	$ 21	$ 19