PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Pension Plans [Member]
Service cost	$ 9	$ 9	$ 26	$ 27
Interest cost	28	36	84	108
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(50)	(52)	(150)	(158)
Defined Benefit Plan, Amortization of Gain (Loss)	27	20	81	62
Net periodic benefit cost	14	13	41	39
Other Postretirement Benefits [Member]
Service cost	0	0	1	0
Interest cost	1	2	4	6
Defined Benefit Plan, Amortization of Gain (Loss)	(1)	(2)	(4)	(6)
Net periodic benefit cost	$ 0	$ 0	$ 1	$ 0