CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 292	$ 17	$ 407	$ 180
Items related to employee benefit plans:
Change in net actuarial loss, net of $(11), $(22), $(22) and $(42) tax	35	30	68	61
Change in net prior service costs, net of $(1), $(1), $(2) and $(2) tax	2	2	4	4
Foreign currency translation adjustment and other, net of $44, $—, $30 and $— tax	(239)	4	(160)	2
Other comprehensive (loss) income	(202)	36	(88)	67
COMPREHENSIVE INCOME	$ 90	$ 53	$ 319	$ 247