EMPLOYEE BENEFIT PLANS (Change in Projected Benefit Obligation and Plan Assets and Reconciliation of Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits
Change in Benefit Obligation
Beginning of Period	$ 440	$ 475
Actuarial (Gain) Loss	76	(42)
Interest Cost	18	16	$ 15
Service Cost	13	15	13
Benefits Paid	(23)	(23)
Plan Amendments	1	(1)
End of Period	525	440	475
Change in Fair Value of Plan Assets
Beginning of Period	376	403
Actual Return on Plan Assets	81	(25)
Benefits Paid	(22)	(23)
Employer Contributions	11	21
End of Period	446	376	403
Funded Status at End of Period	(79)	(64)
Expected future contribution	11
Other Postretirement Benefits
Change in Benefit Obligation
Beginning of Period	74	82
Actuarial (Gain) Loss	4	(8)
Interest Cost	3	2	2
Service Cost	4	5	4
Benefits Paid	(6)	(5)
Plan Amendments	0	(2)
End of Period	79	74	82
Change in Fair Value of Plan Assets
Beginning of Period	17	17
Actual Return on Plan Assets	4	(1)
Benefits Paid	(6)	(5)
Employer Contributions	6	6
End of Period	21	17	$ 17
Funded Status at End of Period	(58)	$ (57)
Expected future contribution	$ 1